Some standard content:
UDC 621.318.5:621.395.72
National Standard of the People's Republic of China
GB/T3972—1992
Relays for crossbartelephoneswitching systems1992-10-06 Issued
State Administration of Technical Supervision
1993-05-01 Implementation
National Standard of the People's Republic of China
Relays for crossbar telephone switching systems
Relays for crossbar telephone switching systems1 Subject content and scope of application
GB/T3972—1992
Replaces GB3972—83
This standard applies to PR101, JTX and JR14 relays (hereinafter referred to as relays); these three types of relays are mainly used as control elements of crossbar telephone switching systems, and can also be used for other switches, other communication equipment and automatic control devices. The use conditions of the relays are shown in Table 1.
Relative humidity
Working position
Working voltage
Adaptable environment
2 Varieties and specifications
Conventional type
Moisture-proof type
+5～+40℃, limit -10~+55℃
When +30℃
reach 80%
2.1 Relays are divided into conventional type and moisture-proof type. The specific models are as follows: Conventional type: PR101, JTX, JR14;
Moisture-proof type: PR101F.
2.2 The external structure of the relay is shown in Figure 1, and the installation dimensions are shown in Figure 2. 65~106kPa
The reed is sideways or vertically upward
<100v(dc)
Ground fixed device
2.3 The contact combination, coil, magnetic isolation plate and pole shoe of the relay can have the following changes according to different requirements. At +30℃
Up to 95%
2.3.1 The contact combination has four basic contact modes: dynamic closing, static closing, conversion and closing first and then breaking, and 31 contact combinations can be formed from these four basic modes, as shown in Figure 3. bzxZ.net
2.3.2 The coil can have up to 3 windings, and a short-circuit winding made of bare copper wire for slow motion can be added. The coil specifications are shown in Appendix A (Supplement) Table A1 to Table A4 (excluding JTX type). The arrangement of the winding output terminals is shown in Figure 4. 2.3.3 The thickness of the magnetic shielding sheet is divided into four types: 0.05mm, 0.10mm, 0.20mm and 0.30mm. Approved by the State Bureau of Technical Supervision on October 6, 1992 and implemented on May 1, 1993
GB/T3972—1992
2.3.4 Pole shoes: divided into two types: electrical pure iron and copper. 2.4 The specification code of the relay consists of the coil code, contact group code and the thickness of the magnetic shielding sheet. When using copper pole shoes, T should be added after the thickness of the magnetic shielding sheet in the specification code.
2.5 The marking of the relay consists of the model, name, specification code and the number of this standard. Example 1 The relay with coil of 0.08mm diameter enameled wire, 10000 turns, 12009, 4 pairs of switching contacts, and 0.10mm thickness of magnetic shielding plate should be marked as:
PR101 relay 118-01-10GB3972-92 or JR14 relay 118-01-10GB3972-92. Example 2 The relay with coil No. 050, 4 pairs of switching contacts, 0.05mm thickness of magnetic shielding plate and copper pole shoes should be marked as PR101 relay 050-01-05TGB3972-92. Note: The manufacturer can add the factory code and product drawing number after the standard number of the mark. 3 Technical requirements
3.1 The external structural dimensions and installation dimensions of the relay shall comply with the provisions of Figures 1 and 2. 3.2 The shape, size, surface roughness, surface treatment and coating performance parameters of relay parts shall comply with the provisions of the manufacturer's design documents. The entire relay should be neat and tidy in appearance, without any broken, defective, rusty, stain, deformed, oversized burr and rough outline. 3.3 The surface of the relay reed and coil outlet terminals should have a continuous tin layer as specified in the drawings, the solder joints of the coil outlet terminals should be smooth, and the coil frame should not be stained with flux. 3.4 All contact groups of the relay should function correctly, and the actions of different reed contacts of the same combination should be touched and separated at the same time. The switching contact group should be separated first and then closed when the relay is actuated, and the contact group that is closed first and then separated should be able to make the contact circuit switch uninterruptedly when it is actuated; the double contacts should act simultaneously. 3.5 The contact pressure of the relay contact should be 0.18~0.26N. 3.6 When the contact is closed, the distance between the moving reed and the push card should be no less than 0.20mm. 3.7 The gap between the dynamic closing, static closing, switching and closing first and then separating contacts when they are disconnected should be no less than 0.25mm. 3.8 The contact resistance of the contacts shall not be greater than 0.052. 3.9 The DC resistance error of the relay coil shall be less than 10%. 3.10 The relay's energized ampere-turns shall not be greater than the provisions of Table 2, and the relay's released ampere-turns shall not be less than the provisions of Table 2. When there are special requirements, the relay's non-energized ampere-turns and holding ampere-turns shall comply with the requirements of Table 2. Table 2
Contact group number
Energized ampere-turns
Release ampere-turns
Non-energized ampere-turns
Holding ampere-turns
Contact group number
Energized ampere-turns
GB/T3972—1992
Continued Table 2
Release ampere-turns
Note: The thickness of the relay magnetic shielding sheet applicable to this table is 0.Imm, and the armature travel is as follows: Contact group
only With dynamic closing and static closing
With conversion
With closing first and then releasing
Armature travel
Non-attracting ampere-turns
0.80±0.05mm
0.95±0.05mm
1.10±0.05mm
Maintaining ampere-turns
②For relays with copper pole shoes, the closing ampere-turns can be increased by 20% compared with the numbers in the table, and the releasing ampere-turns can be reduced to one third of the numbers in the table. ③For relays with 0.2mm and 0.3mm magnetic isolation sheets, the closing ampere-turns can be increased by 10% and 20% respectively compared with the numbers in the table, and the releasing ampere-turns can remain unchanged according to the numbers in the table.
The coil is 0.08mm enameled wire, 10000 turns, 12002, the thickness of the magnetic isolation sheet is 0.1mm, the pure iron pole shoe current is 50mA, and its pull-in time and release time should not exceed the requirements of Table 3. 3
Contact group number
Pull-in time
GB/T3972—1992
Release time
Contact group number
2The contact bounce of the relay when it is pulled in and released should not exceed 4ms. 3.12
3When the continuous input power of the coil is 4W, the average temperature rise of the coil should not exceed 65℃. 3.13
Pull-in time
Release time
3.14 The dielectric insulation strength between the unconnected conductive parts of the relay and between the conductive parts and the core yoke should be able to withstand an AC voltage of 500V with a frequency of 50Hz for 1min, or the voltage increases to 600V and remains for 1s without breakdown, arcing and surface discharge, and there should be no leakage current exceeding ImA. 3.15 The insulation resistance between the unconnected conductive parts of the relay and between the conductive parts and the core yoke should be not less than 500MQ. 3.16 The relay should be able to withstand vibration with a frequency of 10 to 55Hz and a full amplitude of 0.7mm from peak to valley without structural looseness and mechanical damage. After vibration, the dielectric insulation strength, contact pressure, pull-in and release currents of the relay should meet the requirements of Articles 3.14, 3.5 and Articles 3.10 or 3.11 respectively.
3.17 The relay shall be able to withstand repeated collisions with an impact strength of 10g without structural loosening and mechanical damage, and its contact pressure, pull-in and release currents shall comply with the provisions of Article 3.5 and Article 3.10 or 3.11 respectively. 3.18 The relay shall be able to operate under the climatic conditions listed in Table 4 and withstand such climatic conditions for a considerable period of time without structural deformation or damage. The insulation resistance shall be greater than 10MQ, and its pull-in and release currents shall still comply with the provisions of Article 3.10 or 3.11. Table 4
Conventional type
Wet type
+30℃
+30℃
Relative humidity
Atmospheric pressure
86~106kPa
86~106kPa
3.19 The relay should be able to work under the condition of atmospheric pressure of 65kPa, and the dielectric insulation strength between its unconnected conductive parts and between each conductive part and the iron core should be able to withstand an AC voltage of 350V with a frequency of 50Hz for 1min without breakdown, arcing and surface discharge, and there should be no leakage current exceeding 1mA. 4
GB/T3972-1992
3.20 The relay should be able to work normally under the conditions of extreme ambient temperature of -10℃ and +55℃, and the contact pressure, pull-in and release current of its contacts should comply with the provisions of Article 3.5 and Article 3.10 or 3.11 respectively. 3.21 When the contact load of the relay is the same type of relay (the coil is 10,000 turns of 0.08mm enameled round copper wire, and the resistance is 1200Ω), and the external DC voltage is 60V, its operating life should comply with the following provisions. 3.21.1 When the relay contacts are not protected by spark extinguishing device: a. The operating life should be no less than 5×10° times; b. The
destructive failure rate should be no more than 0.1%/10000 times, or the survival probability after the specified life operation times should be no less than 60.7%, and the
wrong operation failure rate should be no more than 1%/10000 times. When the relay contacts are protected by spark extinguishing device: 3.21.2
The operating life should be no less than 5×10 times,
The destructive failure rate should be no more than 0.01%/10000 times, and the survival probability after the specified life operation times should be no less than b. The
wrong operation failure rate should be no more than 0.1%/10.000 times. c
4 Test method
4.1 The general rules for relay testing are as follows: 4.1.1 Unless otherwise specified, relay testing should be carried out under the following normal climatic conditions: temperature +15~+35℃;
relative humidity 45%~75%;
atmospheric pressure 86~106kPa.
4.1.2 If the parameters to be tested vary according to climatic conditions, the law of their variation according to climatic conditions is unknown, and there is doubt about the test data, then arbitration tests can be carried out under the following climatic conditions. Temperature
+20℃ ±1℃;
63%~67%
relative humidity
atmospheric pressure 86~106kPa.
4.1.3 After environmental tests such as temperature, humidity, and low pressure, the relay should be restored under the following climatic conditions. Temperature Actual laboratory temperature ±2℃, but within the range of +15～+35℃, relative humidity 72%~78%;
Atmospheric pressure 86～106kPa.
4.1.4 The ripple factor of the DC power supply used for testing should be less than 1%, and it should have a large enough capacity. When the voltage regulation rate is from no-load to rated load capacity, it should be less than 2%.
4.1.5 Unless otherwise specified, at the beginning of each test, the relay should be in a good and clean state. During the test, the contacts should not be cleaned or touched, and the entire relay should not be adjusted. 4.2 When checking the dimensions, device accessories, specifications, appearance, shape and dimensions of parts, surface coating and marking items according to Articles 3.1, 3.2, and 3.3, use measuring tools that can ensure the accuracy requirements of the design drawings and visual inspection. 4.3 When checking the correctness and synchronization of the contact group action according to Article 3.4, observe visually or with simple electrical signals (such as lights, resistance meters, etc.).
4.4 Check the contact pressure of the contacts according to the requirements of Article 3.5 in the following way. When the relay is in the non-excitation state, use a dynamometer to measure the pressure of the static contact at the front end as close to the contact as possible. The direction of the dynamometer force should be perpendicular to the plane of the contact spring, so that the relay is attracted according to the specified attraction current. Use the same method to measure the pressure of the dynamic contact. The measurement error of the dynamometer should not be greater than 0.01N. 4.5 Check the distance between the spring and the push card according to the requirements of Article 3.6 in the following way. 5
GB/T3972—1992
Place a 0.20mm thickness gauge in the center of the core, push the armature to the contact thickness gauge, and the dynamic contact should be completely closed; insert a 0.20mm thickness gauge under the rear support foot of the armature, and the static contact should not be disconnected. The accuracy of the thickness gauge should not be lower than the second-level tolerance specified in JJG62. 4.6 Check the contact gap according to the requirements of Article 3.7 and the following method. Put the relay in a non-excited and non-attracted state, insert a thickness gauge between the disconnected (dynamically closed) contact pairs for measurement, the gauge plane should be perpendicular to the line of the minimum distance between the contacts, and pay attention to avoid the contact spring from moving, so that the relay is attracted at the specified attraction current, and use the same method to measure the gap between the disconnected (statically closed) contact pairs. The accuracy of the thickness gauge should not be less than the second-level tolerance specified in JG62. The contact gap can also be measured by optical methods. 4.7 Check the contact resistance of the contacts according to the requirements of Article 3.8 and test them according to the following provisions. 4.7.1 The contact resistance of the contacts is the total resistance measured at the contact spring terminal when the contacts are closed. 4.7.2 Test using the voltage and current method is shown in Figure 5. In this circuit, unless otherwise specified, the current passing through the contacts is 10mA and the contact open circuit voltage is 6V.
4.7.3 The contacts should not work before the test to avoid activation of the contact surface. 4.7.4 After the contacts are closed, a current of specified size is passed through, and the voltage and current of each closed contact are measured once. Each contact should be closed three times and measured three times. The static contact is measured when the relay is in the non-attractive state, and the dynamic contact is measured when the relay is in the attracted state. During the process of the contact changing from closed to open or from open to closed, no voltage should be applied to the contact. 4.7.5 The contact resistance is calculated according to Ohm's law. The same contact is measured three times, and the largest calculated value among the three times is taken as the contact resistance. 4.7.6 When measuring the contact resistance by other methods, the current passing through the contact should not be greater than 10mA, and the contact open circuit voltage should not be greater than 6V. 4.7.7 The test error should not be greater than 10%.
4.8 When checking the coil resistance according to the requirements of Article 3.9, use a bridge or voltage and current methods to measure and record the ambient temperature. Before testing, the relay should be placed in the test environment for no less than 2 hours to ensure that the coil and the surrounding environment reach thermal equilibrium. Convert the coil resistance to the value at 20℃ according to the following formula. 234.5+20
（Q）
Where: t——ambient temperature during measurement, ℃; R—resistance value at temperature t,.
The error of the bridge used for testing should not be greater than 1%. When testing with current and voltage methods, the internal resistance of the voltmeter across the two ends of the coil should be at least 1000 times the measured resistance.
4.9 The inspection of the ampere-turns (or current) of the relay's pull-in and release according to the requirements of Article 3.10 shall be carried out in accordance with the following method. 4.9.1 The test of the relay's pull-in ampere-turns shall be carried out according to the following procedure: the relay coil is energized until all the moving contacts are fully closed and all the static contacts are fully opened. The minimum current value is the pull-in current value. The ampere-turn value calculated at this time is the pull-in ampere-turn. 4.9.2 The release ampere-turns (or current) of the relay shall be tested according to the following procedure: the relay coil is energized and increased to the specified saturation magnetization current value. If the saturation magnetization current is not specified, it shall be magnetized at a value not less than 1.25 times the rated pull-in current value, and then the current is gradually reduced until all the moving contacts are fully opened and all the static contacts are fully closed. The current value is the release current value. The ampere-turn value calculated at this time is the release ampere-turn. 4.9.3 The pull-in ampere-turns (or current) of the relay that is required to be magnetized shall be tested according to the following procedure: first measure the release current according to the method in Article 4.9.2 above, then continue to reduce the current to zero, without changing the direction of the current passing through the coil, and then gradually increase the current until the current value when the moving contacts are all closed and the static contacts are all disconnected is the pull-in current value. The ampere-turns value calculated at this time is the pull-in ampere-turns value.
4.10 Test the pull-in and release time of the relay according to the requirements of Article 3.11 in accordance with the following provisions. 4.10.1 The pull-in time refers to the time from the start of the coil power supply to the time when the contact just reaches the action state, that is, the time until the moving contact just closes for the first time or the static contact just opens for the first time. Unless otherwise specified, the pull-in time shall be calculated based on the last contact that acts as the 6
standard, and does not include the bounce time of the contact. GB/T3972—1992
4.10.2 Release time refers to the time from the power failure of the relay coil to the time when the contacts just reach the restored state, that is, the time until the first opening of the moving contact or the first closing of the static contact. Unless otherwise specified, the release time shall be calculated based on the last restored contact and does not include the bounce time of the contact. 4.10.3 Test method
4.10.3.1 Oscilloscope method: According to the contact combination used for the test, connect according to the basic circuit of Figures 6 to 9. 4.10.3.2 Digital time meter method: According to the specific structure of the digital time meter used, the contacts and coils are connected to the digital time meter. Care must be taken to avoid the transient voltage of the coil affecting the gate circuit of the digital time meter. 4.10.3.3 According to the specific specifications of the relay, the connection of the coil excitation circuit shall be in one of the following ways: a. The excitation circuit consists of the coil directly connected to the power supply. Except for the measuring instrument, no other resistors or reactances are connected in the excitation circuit. The power supply voltage is adjustable and has low internal resistance. b. The excitation circuit consists of a coil, a 60V power supply and a variable resistor connected in series. The excitation current is changed by adjusting the resistor. 4.10.3.4 Unless otherwise specified, the pull-in time shall be tested at 2 times the rated pull-in current (or voltage), and the release time shall be tested after the power is turned off at 2 times the rated pull-in current (or voltage) excitation. 4.10.3.5 The time base error of the oscilloscope shall be less than 3%. The error of the digital time meter shall be less than 1ms. 4.10.3.6 Under the condition of ensuring the measurement accuracy specified in Article 4.10.3.5, other methods may be used for testing. 4.11 According to the requirements of Article 3.12, the bounce time of the contacts shall be tested in accordance with the following provisions. 4.11.1 When the relay is energized or released, the intermittent opening process of the closed contacts or the intermittent closing process of the open contacts caused by the vibration of the reed and other components is called contact bounce. The bounce time does not include the time of dynamic resistance as shown in Figure 14. 4.11.2 The test method is as follows:
a. Test with an oscilloscope. The basic circuit is shown in Figure 14. The contact open circuit voltage is 2~6V, and the contact current is not more than 6mA. The contact bounce is tested when the relay is energized at 2 times the rated energizing current (or voltage) and when it is de-energized and released. b.
The energization or de-energization of the relay coil should be instantaneous. 4.12 When testing the temperature rise of the coil according to the requirements of Article 3.13, the DC resistance of the coil shall be converted by measuring the DC resistance of the coil after inputting the specified electric power. The test shall comply with the following provisions.
The coil to be tested is a single winding, the full winding degree shall not be greater than 50%, and the resistance shall not be greater than 20002. 4.12.1
The relay to be tested shall be protected from external airflow, sunlight or other thermal radiation. 4.12.2
Measure the cold resistance of the coil after the relay has been placed in the test environment for no less than 2 hours. 4.12.4 Input 4W of electric power to the coil, so that the coil heats up and reaches thermal equilibrium under this input power. When the current passing through the coil and the voltage across the coil do not change for more than 15 minutes, it can be considered that thermal equilibrium has been reached. 4.12.5 After the coil reaches thermal equilibrium, measure the resistance or calculate the resistance from the current and voltage while maintaining the electric power input condition. 4.12.6 Calculate the average temperature rise of the coil according to the following formula: (B2=-1)(234.5 +t)(℃)
Where: t is the ambient temperature when the coil cold resistance is measured, ℃, R1 is the coil cold resistance measured when the ambient temperature is t, Q; R2 is the coil resistance when 4W electric power is input and thermal equilibrium is reached, 2. 4.13 When testing the dielectric insulation strength of the relay according to Article 3.14, when the relay is in the non-excitation state and the rated pull-in excitation state, apply voltage to any mutually insulated part of the relay, and gradually increase the voltage to 500V and keep it for 1min (or increase the voltage to 600V and keep it for 1s), and observe whether there is breakdown, surface arcing, leakage, etc. In the rated pull-in excitation state, the dielectric insulation strength between the winding and other parts is not tested. The voltage waveform of the test equipment should be a sine wave, the waveform distortion should be less than 5%, and the capacity of the test equipment should meet the requirement that when the leakage current reaches 1mA, the change of the test terminal voltage should be less than 5%. 4.14 When testing the dielectric insulation resistance of the relay in accordance with Article 3.15, when the relay is in the non-excitation state and the rated energized state, use a megohmmeter with a voltage of 250V to test all mutually insulated parts of the relay, but do not test the insulation resistance between the winding and other parts in the rated energized state. The relay shall not be cleaned at the beginning of the test and during the test. The total test error including the instrument, wiring, pad, etc. shall not be less than 10%. 4.15 The vibration resistance inspection of the relay in accordance with Article 3.16 shall be carried out in accordance with the following provisions. 4.15.1 Install the relay in the actual use method, firmly install it on the vibration table with a clamp, and install it three times in three mutually perpendicular directions according to the axis of the relay. Change the installation once for each vibration. When the axis of the relay is in the direction of the plumb line, the armature position should be at the top.
4.15.2 In the non-excited state of the relay, vibrate in three mutually perpendicular directions for 25 minutes in each direction. The vibration frequency is continuously scanned at a logarithmic speed within the range of 10 to 55 Hz. The scanning period is 5 minutes. The vibration waveform is sinusoidal. The ratio of high-order harmonics contained in the waveform at the sample installation position should not exceed 25%. The full amplitude of the vibration is 0.7 mm, and the allowable deviation is ±15%. The full amplitude of the vibration in the direction perpendicular to the specified vibration direction at the installation position of the sample should not exceed 0.18 mm (when there is no scanning frequency vibration equipment, it is allowed to use a fixed frequency of 50 Hz for vibration test). 4.15.3 After the vibration is completed, check the relay. There should be no mechanical damage and loose assembly. The dielectric insulation dielectric strength should still meet the requirements of Article 3.14. The contact pressure and the pull-in and release currents (or voltages) should meet the requirements of Articles 3.10 and 3.5. 4.16 When checking the collision resistance of the relay according to Article 3.17, install the relay in the normal use mode, directly or indirectly fix it firmly on the impact table with a clamp, and collide with the relay axis in three mutually perpendicular axes, each axis is divided into two directions, positive and negative, but excluding the position when the relay axis is in the plumb line direction and the armature is at the bottom, a total of 5 directions, at a speed of 10g, the relay should be in a non-excitation state, and collide 1000 ± 10 times in each direction. The impact waveform of the collision should be a sine half wave, the duration is 16ms, 1 to 3 times per second, and the acceleration in the direction perpendicular to the collision axis should not exceed 30% of the specified collision acceleration peak. After the collision, check the relay, there should be no mechanical damage and loose assembly, and its contact pressure, pull-in and release current (or voltage) should meet the requirements of Articles 3.5 and 3.10 respectively. 4.17 When checking the moisture resistance of the relay according to Article 3.18, the test shall be carried out in accordance with the following provisions. 4.17.1 The relay shall first be inspected and qualified according to the requirements of Articles 3.2, 3.5, 3.8, 3.10, 3.14 and 3.15. 4.17.2 Place the relay in a temperature and humidity chamber and keep the temperature and humidity in the chamber within the range specified in Table 5. The relay shall be kept in the chamber in a non-excited state for the time specified in Table 5.
Relay
Conventional type
Moisture-proof type
Temperature, ℃
+40±2
+40±2
Relative humidity, %
Test holding time, h
4.17.3 After the test time is over, take out the relay and put it in the climatic conditions specified in Article 4.1.3 for 2 hours to recover. 4.17.4 After restoration, under normal climatic conditions specified in Article 4.1.1, the relay shall be inspected as follows: a. According to the method in Article 4.13, the dielectric insulation strength shall meet the requirements of Article 3.14, but the test voltage shall be changed to 350V and the duration shall be 1min. According to the method in Article 4.14, the dielectric insulation resistance shall not be less than 10M2; check for mechanical damage and loose structure assembly. According to the method in Article 4.4, the contact pressure shall meet the requirements of Article 3.5. According to the method in Article 4.9, the pull-in and release current (or voltage) shall meet the requirements of Article 3.10. d. According to the requirements in Article 3.19, the inspection of the working ability of the relay in a low pressure environment shall be carried out in accordance with the following provisions. 4.18.1 The relay shall first be inspected and qualified according to the requirements in Articles 3.5, 3.10 and 3.14. 4.18.2 Place the relay in a pressure test box. The box should be equipped with measuring and observation devices. Connect the test line to the outside of the box and reduce the pressure in the box to 8
GB/T3972—1992
65kPa. The pressure tolerance is ±5%, and the temperature is within the range of 15~35℃. 4.18.3 Test the dielectric insulation withstand voltage strength according to the method in Article 4.13, but change the test voltage to 350V1min. The test results should meet the requirements of Article 3.21.
4.18.4 Keep the relay at the level in Article 4.18.In the environment specified in Article 2, the relay coil is intermittently energized to make the relay produce suction and release actions. When the power is on, the input power to the coil is 4W, the relay suction and release actions are 58 times per second, the coil power-on and power-off time are equal, the relay operates for a total of 2 hours, and the coil should not be burned out. 4.19 When the working ability of the relay at the specified extreme ambient temperature is tested in accordance with Article 3.20, the following provisions shall be followed. 4.19.1 The relay shall first be tested and qualified in accordance with the requirements of Articles 3.5 and 3.10. 4.19.2 Place the relay in a high-temperature box and connect the test line to the outside of the box. Raise the temperature in the box to +55±2℃, and at the same time pass a current with a rated power of 4W through the coil. After keeping the power on for 1 hour under this condition of 55℃, test the suction and release current or voltage) values according to the method in Article 4.9, and they shall all meet the requirements of Article 3.10. 4.19.3 Take the relay out of the high temperature box and place it under the recovery conditions specified in Article 4.1.3 for 1 hour. Check under normal environmental conditions that the parts should be free of damage and the assembly should not be loose. Check the contact pressure of the contacts according to the method in Article 4.11 and it should still meet the requirements of Article 3.5.
4.19.4 Put the relay into the low temperature box again and connect the test line to the outside of the box to make the temperature inside the box drop to -10±2℃. After keeping it at this temperature for 1 hour, test the pull-in and release current (or voltage) according to the method in Article 4.9 and they should meet the requirements of Article 3.10. 4.19.5 Take the relay out of the low temperature box and place it under the recovery conditions specified in Article 4.1.3 for 1 hour. Check under normal environmental conditions that the parts should be free of damage and the assembly should not be loose. Check the contact pressure of the contacts according to the method in Article 4.4 and it should still meet the requirements of Article 3.5.
4.20 According to the requirements of Article 3.21, the life inspection of the relay shall be carried out in accordance with the following provisions. 4.20.1 The relay shall first be inspected and qualified according to the requirements of Articles 3.2, 3.5~3.9, and 3.10, and the measured values of the parameters specified in the above articles shall be recorded.
4.20.2 For each relay, the load shall be connected as shown in Figure 15. The load coil shall be a relay of the same type with 0.08mm enameled copper wire 10000 turns ±1% and a resistance of 1200g ±10%. The load power supply voltage shall be 60V ±5%. 4.20.3 The intermittent action rate of the contact shall not exceed 8 times per second, and the contact break and continuation time shall be equal. 4.20.4 Each fault shall be recorded. After each contact fault, the contact may be cleaned, but the reed pressure and contact gap may not be adjusted.
Relay action failure means:
Contacts are not connected;
Contacts cannot be separated;
c. Relay does not absorb;
Relay does not release.
4.20.5 When the contacts are protected by spark extinguishing, the spark extinguishing device is composed of a 0.2uF capacitor and a 200Q resistor in series. Under the conditions agreed by the manufacturer and the user, other spark extinguishing devices may also be used. 4.20.6 The number of allowable faults in the test is as follows: a. Without spark extinguishing protection test
Total number of operations
Allowed number of wrong operation faults
Total number of operations
Allowed number of damaging faults
5×106
9.16×106
With spark extinguishing protection test
Total number of operations
Allowed number of wrong operation faults
Total number of operations
Allowed number of damaging faults
52.4×108
91.6×106
GB/T3972—1992
10×100
20.2×106
104.8×108
202×106
Note: Total number of operations=number of relays×number of operations. 20×108
31.1×108
208×106
311×106
30×108
40 ×108
41.8×106
300.4X106
523×106
402×108
62 9×106
50×108
505×10%
734×106
4.20.7 After the test, check according to the methods of 4.2, 4.4~4.6, 4.8, 4.9, etc., measure and record the contact pressure, contact gap, height of the magnetic shielding plate, contact resistance and the pull-in release current (or voltage). After the specified number of life tests, if the relay meets all the following conditions, it can be considered qualified and continue to survive. The wrong action failure rate in the life test should not be greater than the specified; a.
The contact pressure should not be less than 0.12N, the contact should be able to be reliably switched, the magnetic shielding plate should not fall off, and for the contacts with spark extinguishing protection, the contact resistance after the test should not be greater than 0.12;
25%.
The pull-in current (or voltage) shall not be greater than 20% of the provisions in Article 3.10, and the release current shall not be less than the provisions in Article 3.10. 5 Inspection Rules
The acceptance of relays is divided into acceptance test and routine test according to the technical requirements of Articles 3.1 to 3.23. 5.1
The acceptance test shall be carried out by the quality management department of the manufacturer according to the items specified in Table 6, and the ordering party has the right to conduct re-inspection. Table 6
Structure, appearance, specification mark
Mechanical adjustment
Electrical and time parameters
Coil resistance
Dielectric insulation dielectric strength
Insulation resistance
Technical requirements
3.10,3.11
Time parameters are tested only when specified
5.3 Routine tests are conducted by the manufacturer's quality management department on samples from the relays that have been delivered and tested and passed. The relays used for routine tests should be divided into 3 groups and tested according to the items and sequence specified in Table 7. The manufacturer should provide routine test reports when the ordering party makes a request.
GB/T3972—1992
Collision resistance
Vibration resistance
Coil temperature rise
Low temperature and high temperature resistance
Low pressure resistance
Moisture resistance
Contact resistance
Contact bounce
Life test
Technical requirements
5.4 During acceptance and routine tests, if the relay does not meet the technical requirements of the standard and any point specified in the drawings or documents described in the technical requirements, it constitutes a defect. Relays with one or more defects are called unqualified products. According to the different defects, they can be divided into serious and light unqualified products. The specific division of these two types of unqualified products shall be determined by the manufacturer and the ordering party through negotiation. 5.5 The acceptance test of relays submitted in batches shall be conducted by sampling inspection method. The sampling plan shall be selected by the ordering party and the manufacturer according to the product quality in accordance with GB2828 (Counting sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)). 5.6 The sampling plan of relays in routine tests shall be selected and determined by the manufacturer according to the quality level of the product in accordance with GB2829 "Counting sampling procedure and sampling table for periodic inspection (applicable to inspection of production process stability)". Routine tests shall be conducted at least once a year and shall be conducted when materials, designs and processes are changed. 5.7 Relays that have undergone routine tests shall not be delivered as commodities. 6 Marking, packaging, transportation and storage
6.1 Marking
Relays shall clearly indicate the following points:
a. The logo of the manufacturer and the merchant,
The model and specification code of the relay;
c: Coil The wire diameter, number of turns and DC resistance of each winding. 6.2 Packaging
6.2.1 The relay should have a special packaging box, and there should be shockproof padding between the relays. If more than one relay is placed in the packaging box, there should be shockproof padding between the relays. There should be a label on the packaging box, clearly indicating the following points: a.
Manufacturer's name and trademark;
Relay model, specification code and quantity; packing personnel's name or code;
Packing date;
Manufacturer's quality inspection seal.
The packaging box containing the relay should be placed in a dry transport box during transportation. The box should have moisture-proof facilities. The space between the packaging box and the box should be filled with shockproof materials. A packing list should be attached to the box, which should indicate: a.
Manufacturer's name;
Relay model and specification code in the box, 112. Place the relay in a high temperature box and connect the test wire to the outside of the box. Raise the temperature in the box to +55±2℃, and pass a current with a rated power of 4W through the coil. Keep the power on for 1 hour at 55℃. Test the pull-in and release current (or voltage) values according to the method in Article 4.9. They should all comply with the provisions of Article 3.10. 4.19.3. Take the relay out of the high temperature box and place it under the recovery conditions specified in Article 4.1.3 for 1 hour. Check under normal environmental conditions that the parts should be free of damage and the assembly should be free of looseness. Check the contact pressure of the contacts according to the method in Article 4.11. They should still comply with the provisions of Article 3.5.
4.19.4. Place the relay in a low temperature box again and connect the test wire to the outside of the box. Raise the temperature in the box to -10±2℃. Keep it at this temperature for 1 hour. Test the pull-in and release current (or voltage) values according to the method in Article 4.9. They should all comply with the provisions of Article 3.10. 4.19.5 Take the relay out of the low temperature box and place it under the recovery conditions specified in Article 4.1.3 for 1 hour. Check under normal environmental conditions that the parts should be free of damage and the assembly should be free of looseness. Check the contact pressure of the contacts in accordance with the method in Article 4.4 and it should still meet the requirements of Article 3.5.
4.20 According to the requirements of Article 3.21, the life inspection of the relay shall be carried out in accordance with the following provisions. 4.20.1 The relay shall first be inspected and qualified in accordance with the requirements of Articles 3.2, 3.5~3.9, and 3.10, and the measured values of the parameters specified in the above articles shall be recorded.
4.20.2 Each relay shall select a contact point, and the load shall be connected as shown in Figure 15. The load coil is a relay of the same type with 0.08mm enameled copper wire 10000 turns ±1% and a resistance of 1200g ±10%. The load power supply voltage is 60V ±5%. 4.20.3 The intermittent action rate of the contact should not exceed 8 times per second, and the contact break and continuation time should be equal. 4.20.4 Each fault should be recorded. After each contact fault, the contact is allowed to be cleaned, but the reed pressure and contact gap are not allowed to be adjusted.
Relay action failure refers to:
Contact contact is not connected;
Contact cannot be separated;
c. Relay does not absorb;
Relay does not release.
4.20.5 When the contact is protected by spark extinguishing, the spark extinguishing device is composed of a 0.2uF capacitor and a 200Q resistor in series. Under the conditions agreed by the manufacturer and the user, other spark extinguishing devices can also be used. 4.20.6 The number of allowable faults in the test is as follows: a. Without spark extinguishing protection test
Total number of operations
Allowed number of wrong operation faults
Total number of operations
Allowed number of damaging faults
5×106
9.16×106
With spark extinguishing protection test
Total number of operations
Allowed number of wrong operation faults
Total number of operations
Allowed number of damaging faults
52.4×108
91.6×106
GB/T3972—1992
10×100
20.2×106
104.8×108
202×106
Note: Total number of operations=number of relays×number of operations. 20×108
31.1×108
208×106
311×106
30×108
40 ×108
41.8×106
300.4X106
523×106
402×108
62 9×106
50×108
505×10%
734×106
4.20.7 After the test, check according to the methods of 4.2, 4.4~4.6, 4.8, 4.9, etc., measure and record the contact pressure, contact gap, height of the magnetic shielding plate, contact resistance and the pull-in release current (or voltage). After the specified number of life tests, if the relay meets all the following conditions, it can be considered qualified and continue to survive. The wrong action failure rate in the life test should not be greater than the specified; a.
The contact pressure should not be less than 0.12N, the contact should be able to be reliably switched, the magnetic shielding plate should not fall off, and for the contacts with spark extinguishing protection, the contact resistance after the test should not be greater than 0.12;
25%.
The pull-in current (or voltage) shall not be greater than 20% of the provisions in Article 3.10, and the release current shall not be less than the provisions in Article 3.10. 5 Inspection Rules
The acceptance of relays is divided into acceptance test and routine test according to the technical requirements of Articles 3.1 to 3.23. 5.1
The acceptance test shall be carried out by the quality management department of the manufacturer according to the items specified in Table 6, and the ordering party has the right to conduct re-inspection. Table 6
Structure, appearance, specification mark
Mechanical adjustment
Electrical and time parameters
Coil resistance
Dielectric insulation dielectric strength
Insulation resistance
Technical requirements
3.10,3.11
Time parameters are tested only when specified
5.3 Routine tests are conducted by the manufacturer's quality management department on samples from the relays that have been delivered and tested and passed. The relays used for routine tests should be divided into 3 groups and tested according to the items and sequence specified in Table 7. The manufacturer should provide routine test reports when the ordering party makes a request.
GB/T3972—1992
Collision resistance
Vibration resistance
Coil temperature rise
Low temperature and high temperature resistance
Low pressure resistance
Moisture resistance
Contact resistance
Contact bounce
Life test
Technical requirements
5.4 During acceptance and routine tests, if the relay does not meet the technical requirements of the standard and any point specified in the drawings or documents described in the technical requirements, it constitutes a defect. Relays with one or more defects are called unqualified products. According to the different defects, they can be divided into serious and light unqualified products. The specific division of these two types of unqualified products shall be determined by the manufacturer and the ordering party through negotiation. 5.5 The acceptance test of relays submitted in batches shall be conducted by sampling inspection method. The sampling plan shall be selected by the ordering party and the manufacturer according to the product quality in accordance with GB2828 (Counting sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)). 5.6 The sampling plan of relays in routine tests shall be selected and determined by the manufacturer according to the quality level of the product in accordance with GB2829 "Counting sampling procedure and sampling table for periodic inspection (applicable to inspection of production process stability)". Routine tests shall be conducted at least once a year and shall be conducted when materials, designs and processes are changed. 5.7 Relays that have undergone routine tests shall not be delivered as commodities. 6 Marking, packaging, transportation and storage
6.1 Marking
Relays shall clearly indicate the following points:
a. The logo of the manufacturer and the merchant,
The model and specification code of the relay;
c: Coil The wire diameter, number of turns and DC resistance of each winding. 6.2 Packaging
6.2.1 The relay should have a special packaging box, and there should be shockproof padding between the relays. If more than one relay is placed in the packaging box, there should be shockproof padding between the relays. There should be a label on the packaging box, clearly indicating the following points: a.
Manufacturer's name and trademark;
Relay model, specification code and quantity; packing personnel's name or code;
Packing date;
Manufacturer's quality inspection seal.
The packaging box containing the relay should be placed in a dry transport box during transportation. The box should have moisture-proof facilities. The space between the packaging box and the box should be filled with shockproof materials. A packing list should be attached to the box, which should indicate: a.
Manufacturer's name;
Relay model and specification code in the box, 112. Place the relay in a high temperature box and connect the test wire to the outside of the box. Raise the temperature in the box to +55±2℃, and pass a current with a rated power of 4W through the coil. Keep the power on for 1 hour at 55℃. Test the pull-in and release current (or voltage) values according to the method in Article 4.9. They should all comply with the provisions of Article 3.10. 4.19.3. Take the relay out of the high temperature box and place it under the recovery conditions specified in Article 4.1.3 for 1 hour. Check under normal environmental conditions that the parts should be free of damage and the assembly should be free of looseness. Check the contact pressure of the contacts according to the method in Article 4.11. They should still comply with the provisions of Article 3.5.
4.19.4. Place the relay in a low temperature box again and connect the test wire to the outside of the box. Raise the temperature in the box to -10±2℃. Keep it at this temperature for 1 hour. Test the pull-in and release current (or voltage) values according to the method in Article 4.9. They should all comply with the provisions of Article 3.10. 4.19.5 Take the relay out of the low temperature box and place it under the recovery conditions specified in Article 4.1.3 for 1 hour. Check under normal environmental conditions that the parts should be free of damage and the assembly should be free of looseness. Check the contact pressure of the contacts in accordance with the method in Article 4.4 and it should still meet the requirements of Article 3.5.
4.20 According to the requirements of Article 3.21, the life inspection of the relay shall be carried out in accordance with the following provisions. 4.20.1 The relay shall first be inspected and qualified in accordance with the requirements of Articles 3.2, 3.5~3.9, and 3.10, and the measured values of the parameters specified in the above articles shall be recorded.
4.20.2 Each relay shall select a contact point, and the load shall be connected as shown in Figure 15. The load coil is a relay of the same type with 0.08mm enameled copper wire 10000 turns ±1% and a resistance of 1200g ±10%. The load power supply voltage is 60V ±5%. 4.20.3 The intermittent action rate of the contact should not exceed 8 times per second, and the contact break and continuation time should be equal. 4.20.4 Each fault should be recorded. After each contact fault, the contact is allowed to be cleaned, but the reed pressure and contact gap are not allowed to be adjusted.
Relay action failure refers to:
Contact contact is not connected;
Contact cannot be separated;
c. Relay does not absorb;
Relay does not release.
4.20.5 When the contact is protected by spark extinguishing, the spark extinguishing device is composed of a 0.2uF capacitor and a 200Q resistor in series. Under the conditions agreed by the manufacturer and the user, other spark extinguishing devices can also be used. 4.20.6 The number of allowable faults in the test is as follows: a. Without spark extinguishing protection test
Total number of operations
Allowed number of wrong operation faults
Total number of operations
Allowed number of damaging faults
5×106
9.16×106
With spark extinguishing protection test
Total number of operations
Allowed number of wrong operation faults
Total number of operations
Allowed number of damaging faults
52.4×108
91.6×106
GB/T3972—1992
10×100
20.2×106
104.8×108
202×106
Note: Total number of operations=number of relays×number of operations. 20×108
31.1×108
208×106
311×106
30×108
40 ×108
41.8×106
300.4X106
523×106
402×108
62 9×106
50×108
505×10%
734×106
4.20.7 After the test, check according to the methods of 4.2, 4.4~4.6, 4.8, 4.9, etc., measure and record the contact pressure, contact gap, height of the magnetic shielding plate, contact resistance and the pull-in release current (or voltage). After the specified number of life tests, if the relay meets all the following conditions, it can be considered qualified and continue to survive. The wrong action failure rate in the life test should not be greater than the specified; a.
The contact pressure should not be less than 0.12N, the contact should be able to be reliably switched, the magnetic shielding plate should not fall off, and for the contacts with spark extinguishing protection, the contact resistance after the test should not be greater than 0.12;
25%.
The pull-in current (or voltage) shall not be greater than 20% of the provisions in Article 3.10, and the release current shall not be less than the provisions in Article 3.10. 5 Inspection Rules
The acceptance of relays is divided into acceptance test and routine test according to the technical requirements of Articles 3.1 to 3.23. 5.1
The acceptance test shall be carried out by the quality management department of the manufacturer according to the items specified in Table 6, and the ordering party has the right to conduct re-inspection. Table 6
Structure, appearance, specification mark
Mechanical adjustment
Electrical and time parameters
Coil resistance
Dielectric insulation dielectric strength
Insulation resistance
Technical requirements
3.10,3.11
Time parameters are tested only when specified
5.3 Routine tests are conducted by the manufacturer's quality management department on samples from the relays that have been delivered and tested and passed. The relays used for routine tests should be divided into 3 groups and tested according to the items and sequence specified in Table 7. The manufacturer should provide routine test reports when the ordering party makes a request.
GB/T3972—1992
Collision resistance
Vibration resistance
Coil temperature rise
Low temperature and high temperature resistance
Low pressure resistance
Moisture resistance
Contact resistance
Contact bounce
Life test
Technical requirements
5.4 During acceptance and routine tests, if the relay does not meet the technical requirements of the standard and any point specified in the drawings or documents described in the technical requirements, it constitutes a defect. Relays with one or more defects are called unqualified products. According to the different defects, they can be divided into serious and light unqualified products. The specific division of these two types of unqualified products shall be determined by the manufacturer and the ordering party through negotiation. 5.5 The acceptance test of relays submitted in batches shall be conducted by sampling inspection method. The sampling plan shall be selected by the ordering party and the manufacturer according to the product quality in accordance with GB2828 (Counting sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)). 5.6 The sampling plan of relays in routine tests shall be selected and determined by the manufacturer according to the quality level of the product in accordance with GB2829 "Counting sampling procedure and sampling table for periodic inspection (applicable to inspection of production process stability)". Routine tests shall be conducted at least once a year and shall be conducted when materials, designs and processes are changed. 5.7 Relays that have undergone routine tests shall not be delivered as commodities. 6 Marking, packaging, transportation and storage
6.1 Marking
Relays shall clearly indicate the following points:
a. The logo of the manufacturer and the merchant,
The model and specification code of the relay;
c: Coil The wire diameter, number of turns and DC resistance of each winding. 6.2 Packaging
6.2.1 The relay should have a special packaging box, and there should be shockproof padding between the relays. If more than one relay is placed in the packaging box, there should be shockproof padding between the relays. There should be a label on the packaging box, clearly indicating the following points: a.
Manufacturer's name and trademark;
Relay model, specification code and quantity; packing personnel's name or code;
Packing date;
Manufacturer's quality inspection seal.
The packaging box containing the relay should be placed in a dry transport box during transportation. The box should have moisture-proof facilities. The space between the packaging box and the box should be filled with shockproof materials. A packing list should be attached to the box, which should indicate: a.
Manufacturer's name;
Relay model and specification code in the box, 114 Then put the relay into the low temperature box, and connect the test line to the outside of the box, so that the temperature in the box will be -10 ± 2℃, and keep it at this temperature for 1 hour, and then test the pull-in and release current (or voltage) according to the method of Article 4.9, and they should meet the requirements of Article 3.10. 4.19.5 Take the relay out of the low temperature box and place it under the recovery conditions specified in Article 4.1.3 for 1 hour. Under normal environmental conditions, check that the parts should be free of damage and the assembly should be free of looseness, and check the contact pressure of the contacts according to the method of Article 4.4, and it should still meet the requirements of Article 3.5.
4.20 According to the requirements of Article 3.21, the life inspection of the relay shall be carried out in accordance with the following provisions. 4.20.1 The relay shall first be inspected and qualified according to the requirements of Articles 3.2, 3.5~3.9, and 3.10, and the measured values of the parameters specified in the above articles shall be recorded.
4.20.2 Each relay can select any contact. The load should be connected according to Figure 15. The load coil is a relay of the same type with 0.08mm enameled copper wire 10000 turns ±1% and a resistance of 1200g ±10%. The load power supply voltage is 60V ±5%. 4.20.3 The intermittent action rate of the contact should not exceed 8 times per second, and the time of contact interruption and continuation should be equal. 4.20.4 Each fault should be recorded. After each contact fault, the contact can be cleaned, but the reed pressure and contact gap cannot be adjusted.
Relay action failure means:
Contact contact is not connected;
Contact cannot be separated;
c. Relay does not absorb;
Relay does not release.
4.20.5 When the contact is protected by spark extinguishing, the spark extinguishing device is composed of a 0.2uF capacitor and a 200Q resistor in series. Other spark extinguishing devices may also be used under the conditions agreed upon by the manufacturer and the user. 4.20.6 The allowable number of faults in the test is as follows: a. Without spark extinguishing protection test
Total number of operations
Allowed number of wrong operation faults
Total number of operations
Allowed number of damaging faults
5×106
9.16×106
With spark extinguishing protection test
Total number of operations
Allowed number of wrong operation faults
Total number of operations
Allowed number of damaging faults
52.4×108
91.6×106
GB/T3972—1992
10×100
20.2×106
104.8×108
202×106
Note: Total number of operations=number of relays×number of operations. 20×108
31.1×108
208×106
311×106
30×108
40 ×108
41.8×106
300.4X106
523×106
402×108
62 9×106
50×108
505×10%
734×106
4.20.7 After the test, check according to the methods of 4.2, 4.4~4.6, 4.8, 4.9, etc., measure and record the contact pressure, contact gap, height of the magnetic shielding plate, contact resistance and the pull-in release current (or voltage). After the specified number of life tests, if the relay meets all the following conditions, it can be considered qualified and continue to survive. The wrong action failure rate in the life test should not be greater than the specified; a.
The contact pressure should not be less than 0.12N, the contact should be able to be reliably switched, the magnetic shielding plate should not fall off, and for the contacts with spark extinguishing protection, the contact resistance after the test should not be greater than 0.12;
25%.
The pull-in current (or voltage) shall not be greater than 20% of the provisions in Article 3.10, and the release current shall not be less than the provisions in Article 3.10. 5 Inspection Rules
The acceptance of relays is divided into acceptance test and routine test according to the technical requirements of Articles 3.1 to 3.23. 5.1
The acceptance test shall be carried out by the quality management department of the manufacturer according to the items specified in Table 6, and the ordering party has the right to conduct re-inspection. Table 6
Structure, appearance, specification mark
Mechanical adjustment
Electrical and time parameters
Coil resistance
Dielectric insulation dielectric strength
Insulation resistance
Technical requirements
3.10,3.11
Time parameters are tested only when specified
5.3 Routine tests are conducted by the manufacturer's quality management department on samples from the relays that have been delivered and tested and passed. The relays used for routine tests should be divided into 3 groups and tested according to the items and sequence specified in Table 7. The manufacturer should provide routine test reports when the ordering party makes a request.
GB/T3972—1992
Collision resistance
Vibration resistance
Coil temperature rise
Low temperature and high temperature resistance
Low pressure resistance
Moisture resistance
Contact resistance
Contact bounce
Life test
Technical requirements
5.4 During acceptance and routine tests, if the relay does not meet the technical requirements of the standard and any point specified in the drawings or documents described in the technical requirements, it constitutes a defect. Relays with one or more defects are called unqualified products. According to the different defects, they can be divided into serious and light unqualified products. The specific division of these two types of unqualified products shall be determined by the manufacturer and the ordering party through negotiation. 5.5 The acceptance test of relays submitted in batches shall be conducted by sampling inspection method. The sampling plan shall be selected by the ordering party and the manufacturer according to the product quality in accordance with GB2828 (Counting sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)). 5.6 The sampling plan of relays in routine tests shall be selected and determined by the manufacturer according to the quality level of the product in accordance with GB2829 "Counting sampling procedure and sampling table for periodic inspection (applicable to inspection of production process stability)". Routine tests shall be conducted at least once a year and shall be conducted when materials, designs and processes are changed. 5.7 Relays that have undergone routine tests shall not be delivered as commodities. 6 Marking, packaging, transportation and storage
6.1 Marking
Relays shall clearly indicate the following points:
a. The logo of the manufacturer and the merchant,
The model and specification code of the relay;
c: Coil The wire diameter, number of turns and DC resistance of each winding. 6.2 Packaging
6.2.1 The relay should have a special packaging box, and there should be shockproof padding between the relays. If more than one relay is placed in the packaging box, there should be shockproof padding between the relays. There should be a label on the packaging box, clearly indicating the following points: a.
Manufacturer's name and trademark;
Relay model, specification code and quantity; packing personnel's name or code;
Packing date;
Manufacturer's quality inspection seal.
The packaging box containing the relay should be placed in a dry transport box during transportation. The box should have moisture-proof facilities. The space between the packaging box and the box should be filled with shockproof materials. A packi
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