Some standard content:
GB 17701—1999
This standard is equivalent to IEC60934:1993 Circuit Breakers for Equipment (CBE) and its first amendment (1994) and second amendment (1997) in terms of technical content and format.
The formulation of this standard fills the gap in my country's previous lack of a national standard for "circuit breakers for equipment". It will provide protection for the circuits in electrical equipment and provide a unified standard basis for such products in my country. In order to adapt to the needs of domestic and foreign trade, technical and economic exchanges and development as soon as possible.
This standard was first published on March 23, 1999. Appendix A, Appendix B, Appendix C, Appendix D. Appendix E, Appendix G of this standard are all standard appendices; Appendix F is a prompt appendix. This standard was proposed by the State Machinery Industry Bureau. This standard is under the jurisdiction of the National Technical Committee for Standardization of Low Voltage Electrical Appliances, and the reform unit of this standard is: Shanghai Electric Science Research Institute. The main drafters of this standard are: Zhou Hailin and Lin Lin. GB 17701—1999
IEC Foreword
1) IEC (International Electrotechnical Commission) is a worldwide standardization organization composed of all national electrotechnical committees (IEC National Committees). The purpose of IEC is to promote international cooperation on all issues related to standards in the electrical and electronic fields. To this end, IEC publishes international standards in addition to other work. The work of standard formulation is entrusted to technical committees; any IEC National Committee interested in this task may be invited to participate in the standard formulation work. International, governmental and non-governmental organizations associated with the formal EC can also participate in the formulation work. IEC and the International Organization for Standardization (ISO) work closely under the conditions stipulated in the agreement between the two organizations. 2) Formal resolutions or agreements on technical data formulated by IEC Technical Committees, in which all national committees with special concerns about the issue participate, will express international consensus on the subject involved as much as possible. 3) EC has recommendations, technical reports or guidelines for international use published in the form of standards and have been recognized by national committees. 4) In order to promote international uniformity, all National Committees should adopt IEC International Standards as far as possible in their national and local standards. Any inconsistency between IEC standards and corresponding national or local standards should be pointed out as clearly as possible in the national or local standards.
5) IEC does not provide a marking procedure to indicate that its products are approved, nor can it assume responsibility for the conformity of any equipment with a certain standard.
This International Standard IEC 60934 and its Amendments 1 and 2 were prepared by Subcommittee 23E (Household Circuit Breakers and Similar Equipment) of IEC Technical Committee 23 (Electrical Accessories). The second edition of the standard cancels and replaces the first edition of the standard published in 1988 and the technical revisions that constitute it. The text of this standard is based on the first edition of IEC 60934:1988, Amendment 1 (1990), Amendment 2 (1992) and the following documents:
Draft documents
23E(CO)136
23E(CO)142
23E/265/FDIS
Voting reports
23E(CO)138
23E(CO)144
23F/298/RVD
Details of the voting on this standard can be obtained from the voting reports listed in the table above. Annexes A to E and G form an integral part of this standard. Annex F is for reference only.
1 General
1.1 Scope of application
National Standard of the People's Republic of China
Circuit breakers for equipment
Clrcuit-breaker for equipmentGB 17701-1999
Idt IEC 60934:1993
This standard applies to mechanical switching devices designed to provide protection for circuits inside electrical equipment as "circuit breakers for equipment" (CBE).
Circuit breakers for equipment may have a rated short-circuit capacity higher than that required for overload conditions and may also have a limited short-circuit current rating associated with a specified short-circuit protective device (SCPD). This standard is also applicable to the protection of electrical equipment under undervoltage and/or overvoltage conditions. This standard applies to rated voltages not exceeding 440 V AC and/or 250 V DC and rated currents not exceeding 125 A. Note: For AC below 630 V, this standard can be used as a guiding document. This standard includes both circuit breakers for equipment with automatic disconnection only but without automatic re-entry, and circuit breakers for equipment with manual opening and closing operations.
Note that the term \equipment\ includes the meaning of appliances. The protected components are generally motors, transformers and internal wiring, etc. 1.2 Purpose
This standard includes all the requirements necessary to ensure compliance with the operating characteristics required by type tests for these electrical appliances. This standard also includes details related to test requirements and test methods necessary to ensure the reproducibility of test results. 1.3 References
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. The versions shown are valid when this standard is published. All standards will be revised. Parties using this standard should discuss the possibility of using the latest version of the following standard. GB/T4207-1984 Determination of the relative electrical decay index and the residual current tracking index of solid insulating materials under wet conditions (eqv IEC 60112:1979)
GB4208-1993 Degrees of protection of enclosures (IP code) (eqv IEC60529:1989) GB5023.15023.7-1997 Ethylene fluoride insulated cables with rated voltage less than or equal to 450/750V (idt IEC60227) GB/T5169.10-1997 Fire hazard test methods for electric and electronic products General principles for glow-wire test methods (idt IEC 60695-2-10:1994)
GB10963-1999 Overcurrent protection circuit breakers for household and similar use (idtIEC60898:1995) GB/T 13539.1-1992 1
Basic requirements for low-voltage fuses Part 1: Principles, requirements and tests (neq IEC 60269-1:1986)
GB/T 16935.1-1997
Coordination of equipment in low-voltage systems Part 1: Principles, requirements and tests (idt IEC 60664-1:1992)
8 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test GB/T 17626.2-1998
(idt 1EC 61000-4-2:1995)
GB/T 17626.3—1998
Electromagnetic compatibility test and measurement technology: Radio frequency electromagnetic field radiation immunity test State Quality and Technical Supervision Bureau 1999-03-23 Approved 1999-10-01 Implementation
GB 177011999
(idt IEC 61000-4-3:1995)
GB/T17626.4—1998 Electromagnetic compatibility test and measurement technology Electric fast decomposition pulse group immunity test (idt [EC 61000-4-4:1995)
GB/T17626.5—1995
5 Electromagnetic compatibility test and measurement technology Wave pain immunity test (idt IEC 61000-4-5:1995)
IEC60050(441):1984 International Electrotechnical Commission (IEV) Chapter 441, Switchgear, Controlgear and Fuse 2 Definitions
2.1 Electrical appliances
2.1.1 Switchgear switching device An electrical appliance used to connect or disconnect the current of one or several circuits. 2.1.2 Mechanical switching device A switching device that relies on separable contacts to close and disconnect one or several circuits. 2.1.3 Fuse
When the current exceeds the specified value for a long enough time, it disconnects the circuit it is connected to and disconnects the current by melting one or several specially designed components with a certain size ratio. 2.1.4 Circuit Breaker for Equipment (CBE) Circuit-breaker for equipment is a mechanical switch specially designed for protecting equipment. It is best to connect, carry and disconnect current under normal circuit conditions. It can also connect, carry a specified time and automatically disconnect current under specified abnormal circuit conditions. Note: Abnormal circuit conditions may be overcurrent, undervoltage or overvoltage. 2.2 General terms
2.2.1 Overcurrent
Over current
Any current exceeding the rated current.
2.2.2 Overload current Overcurrent occurring in an electrically intact circuit. Note: If the overcurrent lasts for a long enough time, it may also cause damage. 2.2.3 Short-circuit current Overcurrent caused by a fault with negligible impedance between two points at different potentials during normal operation. Note: Short-circuit current may be caused by a fault or by a wrong connection. 2.2.4: Main circuit (of a CBE) All conductive parts of a CBE connected to a circuit for closing and opening the circuit. 2.2.5 Control circuit (of a CBE) A circuit other than the main circuit for which the CBE is used for closing or opening operations, or for closing and opening operations. 2.2.6 Auxiliary circuit (of a CBE) All conductive parts of a CBE connected to a circuit other than the main circuit and the control circuit. 2.2.7 Pole (of a CBE) A part connected only to a separate conductive path of the main circuit of the CBE and having contacts for closing and opening the main circuit. It does not include those parts that connect the poles together and cause the poles to operate together. 2.2.7.1 protected pole
a pole with an overcurrent release (see 2.3.6), 2.2.7.2 unprotected pole a pole without an overcurrent release (see 2.3.6), but usually having the same performance as the protected pole of the circuit breaker for the same equipment in other aspects.
GB 17701—1999
2. 2.7. 3 switched neutral pole a pole used only to switch the neutral pole without limiting the short-circuit capacity. 2.2.8 closed position closed position
a pole in which the main circuit of the circuit breaker for protection equipment is in a predetermined uninterrupted position. 2.2.9 open position open pasitian
a position in which the disconnected contacts in the main circuit of the circuit breaker for equipment are guaranteed to have a predetermined electrical clearance. 2.2.10 Ambient air temperature The temperature of the air surrounding the entire apparatus circuit-breaker measured under specified conditions (e.g., for enclosed apparatus circuit-breakers, the temperature of the air outside the enclosure).
2.2.11 Operation The transition of the moving contact from the open position to the closed position, or vice versa. NOTE If a distinction must be made, an operation in the electrical sense (e.g., making or breaking) is referred to as a switch operation, while an operation in the mechanical sense (e.g., closing or opening) is referred to as a mechanical operation.
2.2.12 Operating cycle Continuous operation from one position to another and then back to the initial position. 2.2.13 Sequence of operations A specified sequence of operations performed at specified time intervals. 2.2.14 Uninterrupted duty The operating mode in which the main contacts of an apparatus circuit-breaker remain closed and carry a steady current for a long period of time (which may be weeks, months, or even years) without interruption.
2.3 Structural elements
2.3.1 Main contact
Contact connected to the main circuit of the equipment circuit breaker and used to carry the main circuit current when in the closed position. 2.3.2 Control contact Control contact Contact connected to the control circuit of the equipment circuit breaker and opened by the equipment circuit breaker in a mechanical manner. 2.3.3 Auxiliary contact A contact connected to the auxiliary circuit of the equipment circuit breaker and operated by the equipment circuit breaker in a mechanical manner. 2.3.4 a-contact (make contact) a contact (make contact) control contact or auxiliary contact that is closed when the main contact of the equipment circuit breaker is closed and opened when the main contact is opened: 2.3.5 b-contacl (break contact) b-contacl (break contact) control contact or auxiliary contact that is opened when the main contact of the equipment circuit breaker is closed and closed when the main contact is opened. 2.3.6 Release
A device mechanically connected to (or integrated with) the equipment circuit breaker and used to release the holding mechanism and automatically disconnect the equipment circuit breaker.
2.3.7 Overcurrent release A release that disconnects the equipment circuit breaker with or without delay when the release current exceeds a predetermined value. Note: In some cases, this value may depend on the rate of rise of the current. 2.3.8 Inverse-time overcurrent release An overcurrent release that disconnects the equipment circuit breaker after a delay inversely proportional to the overcurrent value. Note: This release may be designed so that the delay time approaches a certain minimum value when the overcurrent value is large. 2.3.9 Direct overcurrent release An overcurrent release that is directly activated by the main circuit current of the equipment circuit breaker. 2.3.10 Overload release Overcurrent release used to protect against overload. GE 17701—1999
2. 3. 11 Under-voltage release When the voltage across the release drops below a predetermined value, the device circuit breaker is disconnected with or without a delay. 2. 3. 12 Overvoltage release When the voltage across the release rises above a predetermined value, the device circuit breaker is disconnected with or without a delay. 2. 3. 13 Conductive part A part that is not necessarily used to carry the operating current but can conduct electricity. 2.3. 14 Exposed conductive part An easily accessible, usually non-charged conductive part that may become charged in the event of a fault. In the past, typical exposed conductive parts were metal housing walls and metal operating handles. 2.3.15 Terminals Terminals are conductive parts of electrical appliances that can be repeatedly used for electrical connections. Note: The definition of fan-flat quick-connect terminals is under consideration. 2.3.16 Screw-type terminals are used to connect a conductor and are later detachable, or are used to connect two or more detachable conductors to each other. This connection can be completed directly or indirectly with various screws or nuts. 2.3.17 Pillar Terminals Pillar Terminals are screw-type terminals that are inserted into a hole or cavity and rely on the wax part of the screw to press the conductor together. The tightening pressure can be applied directly by the screw shaft or by the end of the screw that applies pressure through a transition clamping element. For examples of pillar terminals, see Appendix E. 2.3.18 Screw-type terminals are screw-type terminals that are used to press the conductor at the non-screw end. The tightening pressure can be applied directly by the screw head or through a transition part, such as a gasket, clamping plate or anti-loosening device. Note: For examples of screw terminals, see Appendix E. 2.3.19 Stud terminal 9tud terminal A screw-type terminal that is tightened by a conductor nut. The tightening pressure can be applied directly by a suitable shape of the nut or through a pass-through part such as a gasket, clamping plate or anti-loosening device. Note: For examples of stud terminals, see Appendix E. 2.3.20 Saddle terminal 8 Saddle terminal A screw terminal in which the conductor is fastened under a plate by two or more screws or nuts. Note: For examples of saddle terminals, see Appendix E 2.3.21 Lug terminal A screw terminal or stud terminal sheath that uses screws or nuts to compress cable lugs or busbars. For examples of lug terminals, see Appendix E. 2.3.22 Non-screw terminals Screw terminals are used to connect a conductor that can be subsequently removed, or are used as terminals for the removal of two or more mutually removable conductors. The connection is achieved directly or indirectly by means of springs, mold blocks, false heart wheels or conical wheels, and no special processing is required except for piercing the insulation of the conductor.
2.3.23 Tapping screw
A screw made of a material with high deformation resistance that can be inserted into a hole in a material with high deformation resistance. The screws shall be tapered threads, with the inner diameter of the threads at the end being conical. The threads produced by the action of the screw are considered to be reliably formed only when the screw has been rotated a sufficient number of times and exceeds the number of threads on the tapered part. 2.3.24 thread-forming tapping screw GB 17701-1999
A self-tapping screw with a continuous thread. This number of threads will not remove material from the hole. Note: For an example of a self-tapping screw, see Figure 1. 2.3.25 thread-cutting tapping screw A self-tapping screw with a discontinuous thread. This thread is used to cut material from the hole. Note: For an example of a self-tapping screw, see Figure 2.2.4 Operating conditions
2.4.1 Closing operation The operation of a circuit breaker from the open position to the closed position. 2.4.2 Opening operation The operation of a circuit breaker from the closed position to the open position. 2.4.3 Rip-free CBE An equipment circuit breaker that, after the closing operation begins, if an automatic opening operation is performed, the moving contact can return to and remain in the open position even if the closing command is maintained.
An equipment circuit breaker of this structure can be called a completely free-tripping equipment circuit breaker. 2.4.4 Cycling trip-free CBE An equipment circuit breaker that, after the closing operation begins, if an automatic opening operation is performed, the moving contact can return to the open position, but will repeatedly and instantaneously close again as long as the closing command is maintained. 2.5 Characteristic quantity
2.5.1 Rated value
A specified value of any characteristic quantity used to determine the working conditions of the designed and manufactured equipment circuit breaker. 2.5.2 Prospective current (of circuits and of equipment circuit breakers) The current that may flow in a circuit when a conductor of negligible impedance replaces each pole of an equipment circuit breaker. Note: For the purpose of this standard, the present current of an AC circuit is expressed in steady-state AC effective value. 2.5.3 Making and breaking capacities 2.5.3.1 Switching capacity The current value that an equipment circuit breaker can make and break at a specified voltage under specified conditions of use and operation. 2.5.3.2 Short-circuit (making and breaking) capacity Under specified conditions, the equipment circuit breaker can make, carry its breaking time and the AC component value of the expected current that can be broken (expressed as effective value).
2.5.4 Applied voltage Applied voltge The voltage between the two terminals of one pole of the equipment circuit breaker just before the current is connected. Note: For AC, it refers to the effective value
2.5.5 Tripping time Tripping time The time interval from the time when the relevant tripping current begins to flow through the main circuit to the moment when the current (on all poles) is disconnected. Note: Unless otherwise specified in the manufacturer, the test conditions involved in the tripping time refer to the equipment circuit breaker without prior power supply. 2. 5.6 Conventional non-tripping current (I.) Conventional non-tripping current The equipment circuit breaker can carry the specified current value without tripping within a specified time (conventional time). 2. 5.7 Conventional tripping current (I,) The specified current value that causes the equipment circuit breaker to trip within the specified time (conventional time). 2.5.8 Instantaneous non-tripping current (I.) When the instantaneous non-tripping current is lower than this current value, the equipment circuit breaker will not automatically (without artificial delay) operate within a time equal to or less than 0.1 s. 2.5.9 Instantaneous tripping current (l) When the instantaneous tripping current is greater than this current value, the equipment circuit breaker will automatically (without artificial delay) operate within a time less than 0.1 s. GB 177011999
2.5.10 Operating characteristic2.5.10.1 When the tripping characteristic is higher than the time-current characteristic, the equipment circuit breaker should trip. 2.5.10.2 When the non-tripping characteristic is lower than the time-current characteristic, the equipment circuit breaker should not trip. 2.5.11 operating zone the time-current band limited by the operating characteristics of clauses 2.5.10.1 and 2.5.10.2. NOTE This operating zone takes into account the construction and performance characteristics of equipment circuit-breakers. 2.5.72 Definitions of coordination between a CBE and an SCPD connected in the same circuit 2.5.12.1 conditional short-circuit current the value of the current which a equipment circuit-breaker protected by a series short-circuit protection device (SCPD) can withstand under specified conditions of use and performance.
2.5.12.2 short-time withstand current of a CBE the value of the current which a equipment circuit-breaker can satisfactorily withstand for a specified time without any damage prejudicing its further use. 2.5.12.3 Selectivity limit current (I.) The selectivity limit current (see Figure F1) is a current limit value: below this value, the equipment circuit breaker completes its breaking action in time to prevent the SCPD from starting to operate (i.e., ensure selectivity); above this value, the equipment circuit breaker may not complete its breaking action in time to prevent the SCPD from starting to operate (i.e., not ensure selectivity).
2.5.12.4 Electrodynamic contact separation The minimum peak current value that can cause the contacts to open when the operating mechanism remains closed. 2.5.12.5 Take-over current (s) The current coordinate at which the time-current characteristics of two overcurrent protective devices intersect. 2.5.12.6 Over current discrimination between aCBE and its SCPD
The coordination of the operating characteristics of a CBE and its short-circuit protection device (SCPD) so that when an overcurrent occurs within a specified range, the circuit is disconnected by the CBE and the SCPD does not operate. 2.5.12.7 Back-up protection (for a CBF) Overcurrent coordination of two overcurrent protection devices connected in series, i.e. the SCPD ensures overcurrent protection with or without the aid of the CBE and prevents any excessive stress on the CBE. 2.6 Clearance
The shortest distance in air between two conductive parts. Note: For the purpose of determining the clearance of accessible parts, the accessible surface of the insulating enclosure shall be regarded as a conductive part, as if the surface of the enclosure were covered with a layer of grease, and could be touched by hand or by the standard test finger specified in Figure 7. 2.7 Creepage distance
The shortest distance along the surface of the insulating material between two conductive parts. Note: For the purpose of determining the creepage distance of accessible parts, the accessible surface of the insulating enclosure shall be regarded as a conductive part, as if the surface of the enclosure were covered with a layer of grease, and could be touched by hand or by the standard test finger specified in Figure 7. 3 Classification
Circuit breakers for equipment are classified in the following manner. 3.1 Classification by number of poles
General number of poles!
ww.bzsosocomThe number of poles to be protected.
GB 17701—1999
Note: The unprotected pole can be a non-protected pole or a switched neutral pole. 3.2 According to the installation method, it can be divided into
plane installation type;
embedded type;
panel installation type:
-card-mounted type.
Note: Panel installation type includes lap-mounted type and flange type. Card-candy type is an installation method that can be fixed in position only by fixing devices without any other installation tools. 3.3 According to the connection method, it can be divided into
circuit breakers for equipment with wiring unrelated to mechanical installation. One or more connecting wires are related to mechanical installation. Circuit breakers for equipment, such as:, plug-in type!
·bolt type·
screw type;
·welding type. wwW.bzxz.Net
In the past, some equipment circuit breakers may only use plug-in or screw-operated connection methods at the power supply end: while the load end is usually suitable for wire connection methods. 3.4 Classification by operation method
3.4.1 Equipment circuit breakers with automatic disconnection and non-automatic (manual) re-triggering (R type equipment circuit breakers). 3.4.2 Equipment circuit breakers with automatic disconnection and non-automatic (manual) re-triggering, and with a manual operating device for occasional manual opening and closing operations, but not used for regular manual opening and closing operations under normal load conditions (M type equipment circuit breakers). 3. 4.3 Equipment circuit breakers with automatic disconnection and non-automatic (manual) re-triggering, and with a manual operating device that can be used for regular manual opening and closing operations under normal load conditions (S type equipment circuit breakers) (see note to Section 4.2.2). 3.5 Classification by tripping mode
3.5.1 Tripping caused by current (overcurrent) Tripping mode
Thermal tripping
Thermal-electromagnetic tripping
Electromagnetic tripping
Hydraulic-electromagnetic tripping
Electro-hybrid tripping
Identification symbol
Note: Electronic-hybrid tripping means an electronic control device combined with any other tripping mode. 3.5.2 Tripping caused by voltage
Tripping mode
-Overvoltage tripping
Undervoltage tripping
3.6 Classification by the influence of ambient temperature
3.6.1 Circuit breakers for equipment whose operation is related to temperature. 3.6.2 Circuit breakers for equipment whose operation is not related to temperature. 3.7 Classification by free tripping characteristic level
3.7.1 Free tripping (completely free tripping). 3.7.2 Cyclic free tripping.
3.7.3 Non-free tripping.
Identification symbol
GB 17701—1999
Note: Non-free tripping should not be used in places that can be accessed without tools. 3.8 Influence of installation position
3.8.1 Not related to the installation position.
3. 8.2 Related to the installation position.
4 Characteristics of circuit breakers for equipment
4.1 Overview of characteristics
The characteristics of circuit breakers for equipment shall be indicated by the following applicable items: number of poles, number of protective poles and number of neutral poles (if any) (see Article 3.1); installation method (see Article 3.2);
——connection method (see Article 3.3);
operation method (see Article 3.4);
rated capacity (see Article 4.2);
operating characteristics (see Articles 2.5.10 and 2.5.11)4.2 Rated capacity
4.2.1 Rated voltage
The following rated voltages are specified for circuit breakers for equipment. 4.2.1.1 Rated working voltage (U)
The rated working voltage (hereinafter referred to as rated voltage) of circuit breakers for equipment refers to the voltage value related to its performance. Note: Several rated voltages and corresponding rated breaking capacities may be specified for the same equipment circuit breaker. 4.2.1.2 Rated absolute load voltage (0,)
The rated insulation voltage of an equipment circuit breaker refers to the voltage value related to the dielectric test, electrical spacing and creepage distance. Unless otherwise specified, the rated insulation voltage is the maximum rated voltage value of the equipment circuit breaker. In any case, the maximum rated voltage shall not exceed the rated insulation voltage.
4.2.2 Rated current (1,)
The current specified by the manufacturer (according to Table 6) refers to the current that the equipment circuit breaker can carry under long-term working conditions (see Section 2.2.14) at the specified reference ambient air temperature. The reference ambient air temperature is (23 ± 2) °C. Note: For S-type equipment breakers, the manufacturer may specify a rated current for inductive loads that is not greater than that specified in Table 6. 4.2.3 Rated frequency
The power supply frequency is the frequency specified for the equipment circuit breaker and corresponds to other characteristics. 4.2.4 Rated breaking capacity (rated connecting and breaking capacity) The value of the breaking capacity specified by the manufacturer for the equipment circuit breaker (see Section 2.5.3) Note 1 The rated breaking capacity is expressed in terms of the effective value of the current (if it is AC). 4.2.5 Rated conditional short-circuit current (Ic) The value of the limited short-circuit current (see Section 2.5.12) specified by the manufacturer for the equipment circuit breaker. Note: This standard only gives the rated phase-limited short-circuit current value for AC. The rated phase-limited short-circuit current value for DC is under consideration. For the purpose of this standard, two performance categories are specified (see Sections 4.2.5.1 and 4-2.5.2). 4.2.5.1 Rated conditional short-circuit current Ine, the conditions specified for performance category PC1 do not include the rated conditional short-circuit current value for which the equipment circuit breaker is suitable for continued use. 4.2.5.2 Rated short-circuit current Ic, performance category PC2 (optional) The conditions specified include the rated short-circuit current value of the equipment circuit breaker suitable for continued use. 4.2.6 Rated short-circuit capacity Ica
GB17701-1999
The rated short-circuit capacity of the equipment circuit breaker is the current value specified by the manufacturer for the equipment circuit breaker in accordance with Article 2.5.3.2. The rated short-circuit capacity should not be less than;
——AC 6I.1
——DC 4In.
4.3 Standard and preferred values
4.3.1 Preferred values of rated voltage
The preferred values of rated voltage are:
AC: 60 V, 120 V, 240/120 V, 220 V, 230 V, 240 V, 380/220 V, 400/230 V, 415/240 V. 380 V. 400. 415 V, 440 V
DC. 12. 24 V, 48 V, 60, 120 V, 240 V, 250 V. Note: In IEC Publication 38, the AC grid voltage value of 400/230 V has been specified as the standard voltage. This voltage value will replace the 380/220 V and 415/240 V voltage values.
4.3.2 Standard rated frequency
The standard rated frequency is: 5UHz, 60Hz and 400Hz. 4.3.3 Standard value of rated conditional short-circuit current
The rated value of rated conditional short-circuit current is:
300A, 600A, 1000A, 1500A, 3000A.5 Marking and other product information
Each circuit breaker shall be marked with the following in a durable manner: a) Manufacturer's name or trademark;
b) Model or serial number,
c) Rated voltage:
d) Rated current, for S-type equipment circuit breakers, the rated current of the inductive load (if applicable) shall be given separately in brackets; e) Rated frequency, if the frequency of the equipment circuit breaker is not 50 Hz and 60 Hz; f) Equipment circuit breakers at different values (see Section 4.2.2) under the reference ambient temperature corrected for the reference temperature of the reference ambient temperature (for example, \T40\ indicates that the reference temperature is 40°C):
g) (working voltage limit value of voltage-operated equipment circuit breaker); h) If the contact opening distance of the equipment circuit breaker is less than the specified electrical spacing, the symbol "μ" should be marked. i) Operating mode R, M or S (see Article 3.4); k) Tripping mode:
1) Based on the tripping characteristic level (see Article 3.7): m) Overvoltage category (if different from overvoltage category [), and pollution degree (if different from pollution degree 2) (see Article 7.1.3)
a) Rated limiting short-circuit current, performance category PC1: a) Rated limiting short-circuit current, performance category PC2. For small electrical appliances, if the available space does not allow for marking all of the above items, at least items a) and b) and (if applicable) and h) should be marked on the appliance. In addition, if possible, items c) and d) should also be marked, and the remaining items can be given in the sample.
Except for equipment breakers operated by push buttons, the disconnect position of equipment breakers shall be indicated by the symbol "○", while the closed position shall be indicated by the symbol "1\ (a vertical short-circuit straight line). For equipment breakers operated by two buttons, the button used for disconnection operation can only be red and/or marked with the symbol "\". Note: In addition to the symbols ○ and |, the symbols of the respective countries are allowed to be used. GB 17701-1999
Red cannot be used for any other buttons, but can be used for other types of operating mechanisms, such as handles, rockers, etc., as long as the ON and OFF positions can be clearly identified.
If it is necessary to distinguish between the supply and load terminals, the supply terminals shall be marked with the head pointing towards the equipment circuit breaker and the load terminals with the front head facing away from the equipment circuit breaker
Note: Other national or international notations are permitted, for example, 1.3, 5 for supply increase and 2, 4, 6 for load. The terminal used for neutral terminals shall be marked with the mother "N". The terminal for the protective conductor (if any) shall be marked with a symbol. The inspection shall be carried out by visual inspection and by the test of Clause 8.3. Where possible, a wiring diagram shall be provided on the equipment circuit breaker unless the correct wiring method is obvious. On the wiring diagram, the terminal block shall be marked with the symbol -0: The marking shall be durable and easily identifiable and shall not be attached to screws, washers or other removable parts. 6 Standard operating conditions
Equipment circuit breakers complying with this standard shall be capable of operating under the following standard conditions. 6.1 Ambient air temperature
The ambient air temperature shall not exceed +40°C and the average temperature within 24 hours shall not exceed +35°C. The lower limit of the ambient air temperature is -5°C.
Circuit breakers for equipment with ambient air temperatures above +40°C (especially in tropical countries) or below -5°C shall be specially designed or used in accordance with the data provided in the manufacturer's catalog. 6.2 Altitude
The altitude of the installation site shall not exceed 2000m (6600ft). For installations at higher altitudes, the reduction in dielectric strength and air cooling effect must be considered. Circuit breakers for equipment intended for use under these conditions shall be specially designed or used in accordance with the agreement between the manufacturer and the user. The data given in the manufacturer's catalog may replace this agreement. 6.3 Airless conditions
The air is clean and the relative humidity of the air does not exceed 50% at a maximum temperature of +40°C. A higher relative humidity may be allowed at lower temperatures, for example 90% at +20°C. It should be noted that moderate leakage may occasionally occur due to temperature changes, in which case appropriate measures should be taken (e.g. drain holes). 7 Construction and operating requirements
7.1 Mechanical design
7.1.1 General
Apparatus circuit breakers shall be designed and constructed so that they perform reliably and without danger to the user or the surroundings during normal use. This is normally checked by all relevant tests specified. 7.1.2 Mechanism
The moving contacts of multi-pole apparatus circuit breakers shall be mechanically connected so that all protected and unprotected poles are connected and disconnected substantially simultaneously, whether by manual or automatic operation, even if only one pole is tripped. If the apparatus circuit breaker is of the free tripping type, the cyclic tripping type or the non-free tripping type, the manufacturer shall indicate this in his literature. Apparatus circuit breakers shall have means of indicating their closed and open positions, which shall be readily identifiable from the front of the apparatus circuit breaker when the switch or plate (if any) is removed. When the operating tool indicates the contact position, the operating tool shall have two distinct static positions corresponding to the contact position, and when released, the operating tool shall automatically occupy the position corresponding to the disconnection position of the moving contact; for automatic disconnection, the operating tool may have a third position different from the others. The action of the machine shall not be affected by the position of the housing or the switch, and shall be independent of any removable parts.2 Mechanism
The moving contacts of multi-pole circuit breakers shall be mechanically connected so that all protected and unprotected poles are connected and disconnected substantially simultaneously, whether operated manually or automatically, even if only one pole is over-tripped. If the circuit breaker is of the free-tripping type, the cyclic tripping type or the non-free-tripping type, the manufacturer shall specify in his literature. The circuit breaker shall have means for indicating its closed and open positions, which shall be readily identifiable from the front of the circuit breaker when the cover or plate (if any) is removed. When the position of the contacts is indicated by an operating tool, the operating tool shall have two distinct rest positions corresponding to the contact positions and, when released, shall automatically occupy the position corresponding to the open position of the moving contacts; for automatic disconnection, the operating tool may have a third position different from the others. The mechanical action shall not be affected by the position of the housing or the enclosure and shall be independent of any removable parts.2 Mechanism
The moving contacts of multi-pole circuit breakers shall be mechanically connected so that all protected and unprotected poles are connected and disconnected substantially simultaneously, whether operated manually or automatically, even if only one pole is over-tripped. If the circuit breaker is of the free-tripping type, the cyclic tripping type or the non-free-tripping type, the manufacturer shall specify in his literature. The circuit breaker shall have means for indicating its closed and open positions, which shall be readily identifiable from the front of the circuit breaker when the cover or plate (if any) is removed. When the position of the contacts is indicated by an operating tool, the operating tool shall have two distinct rest positions corresponding to the contact positions and, when released, shall automatically occupy the position corresponding to the open position of the moving contacts; for automatic disconnection, the operating tool may have a third position different from the others. The mechanical action shall not be affected by the position of the housing or the enclosure and shall be independent of any removable parts.
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