This standard specifies the terminology for low-voltage electrical appliances, including general terms, product names, structures and components, design parameters and technical performance, as well as general working conditions and test requirements. This standard is applicable to the formulation of low-voltage electrical appliances and their standards, the preparation of technical documents, the writing and translation of professional manuals, teaching materials or books and periodicals, and is used by personnel in production, scientific research, use and teaching in the electrical profession. GB/T 2900.18-1992 Electrical Terminology Low-voltage Electrical Appliances GB/T2900.18-1992 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Electrotechnical terminology: Low voltage apparatus
Electrotechnical terminologyLow voltage apparatus
GB/T 2900.18-92
Replaces GB 2900,18-82
This standard is equivalent to the International Electrotechnical Vocabulary IEV50 (441) (1984) "Switchgear, controlgear and fuses", and refers to the terms and terms related to low voltage apparatus in standards such as IEC947-1 (1988) "General rules for low voltage switchgear and controlgear", IEC269-1 (1986) "General requirements for low voltage fuses", and IEC755 (1983) "General requirements for residual current operated protective devices". 1 Subject content and scope of application
This standard specifies the terminology specific to low voltage apparatus, including general terms, product names, structures and components, design parameters and technical performance, as well as general working conditions and test requirements. This standard applies to the formulation of low-voltage electrical products and their standards, the preparation of technical documents, the writing and translation of professional manuals, teaching materials or books and periodicals, and is used by personnel in production, scientific research, use and teaching and other related departments engaged in electrical professional work. The terms specified in this standard are coordinated with the relevant parts of GB2900.1 Basic Terms of Electrical Terms; terms not specified in this standard may be specified in relevant standards when necessary. 2 Reference standards
GB2900.1 Basic Terms of Electrical Terms
3-General terms
3.1 Low-voltage electrical appliances
3.1.1 Low-voltage apparatus is an electrical appliance (referred to as electrical appliances) used for switching, protection, control or regulation in circuits with an AC voltage of 50Hz (or 60Hz), a rated voltage of 1200V or less, and a DC rated voltage of 1500V or less. 3.1.2 Distribution apparatus is an electrical appliance mainly used in distribution circuits to protect circuits and equipment and switch on and off, convert power or loads. 3.1.3 Control apparatus is mainly used to control the power receiving equipment to achieve the expected working state. 3.1.4 Switchgear and control gear is a general term for the combination of switchgear and switchgear and related control, measuring, protection and adjustment equipment. It also refers to the combination of these electrical appliances and equipment and related internal connecting wires, auxiliary parts, external parts and supporting structural parts. 3.1.5 Switchgear, switchgear
It is a general term for the combination of switchgear and related control, measurement, protection and adjustment equipment mainly related to power generation, transmission, distribution and power conversion. It also refers to the combination of these electrical appliances and equipment and related internal connecting wires, auxiliary parts, housing and supporting structural parts.
3.1.6 Control gear
Approved by the State Administration of Technical Supervision on June 20, 1992, and implemented on March 1, 1993
GE/T 2900.18-92
General term for the combination of switching devices and related control, measurement, protection and regulation equipment used mainly to control the power receiving equipment. It also refers to the combination of these electrical appliances and equipment and related internal connecting wires, auxiliary parts, housings and supporting structural parts.
3.1.7 Switching device Switching device An electrical appliance used to connect or disconnect the current of one or several circuits. 3.1.8 Mechanical switching device A switching device that relies on the action of separable contacts to close or open one or several circuits. 3.1.8.1 Fixed trip mechanical switching device Fixed trip mechanical switching device A mechanical switching device that can only be released in the closed position. Trip-free mechanical switching device 3.1. 8.21
After the closing operation begins, even if the closing command is still maintained, as long as the opening (tripping) operation begins, the moving contact of the mechanical switching device can return to and remain in the open position. Note: In order to ensure accurate interruption of the current that may already exist, the contacts must reach the closed position when they are released. 3.1.9 Semiconductor switching device semiconductorswitching device Switching device that relies on the controllable conductivity of semiconductors to drive or block the circuit current. 3.1.10 Air switching device air switching device Switching device that opens or closes the contacts in the air. Oil-immersed switching device oil-immersed switching device 3.1. 11
Switching device that opens or closes the contacts in oil. 3.7.12 Vacuum switching device vacuum switching device Switching device that opens or closes the contacts in a vacuum. 3.1.13 Short-circuit protective device (SCPD) Short-circuit protective device An electrical device that protects a circuit or circuit component from damage by breaking short-circuit current. 3.1.14 Control circuit device An electrical device used for control, signaling, and interlocking in switchgear and controlgear. 3.1.15 Indoor switchgear and controlgear Switchgear and controlgear Specially designed for installation in buildings or other houses that can resist wind, rain, snow, abnormal dust, abnormal condensation, ice, and thick frost.
3.1.16 Outdoor switchgear and controlgear Outdoor switchgear and controlgear Switchgear and controlgear that can be installed outdoors and are resistant to wind, rain, snow, dust, condensation, ice, and thick frost. 3.1.17 Fuse
When the current exceeds the specified value for a long enough time, it disconnects the circuit it is connected to and disconnects the power supply by fusing one or more specially designed and corresponding components. The fuse includes all the parts that make up a complete electrical appliance. 3.1.18 Enclosute
It can provide a specified degree of protection to prevent certain external influences and prevent approaching and touching live parts and moving parts.
3.2 Type of protection
3.2.1 No protection (open) type Symbol IP00) no prutectionLcode1P00) No enclosure or although there is an enclosure, it cannot prevent foreign objects from touching its internal working parts. 3.2.2 Protection type E Symbol IP1X, IP2LX, IP3X, IP3LX, IP4X, IP4LX) ProtectionLcode IP1X, IP2LX, IP3X, IP3LX, IP4X, IP4LXJ
There is an outer party, which can prevent solid foreign objects with a diameter exceeding the specified value from entering the shell, and can prevent tools, wires, test probes, etc. with a length or thickness (or diameter) not exceeding the specified value from touching the live or moving parts inside the shell. GB/T 2900. 18— 92
3.2.3 Dustproof type [symbol IP5X] dust protected (code IP5X} has a shell that can prevent dust from entering to the extent that it affects the normal operation of the appliance. 3.2.4 Dustproof type symbol P6X] dust protected (code IP6X] has a shell that can completely prevent dust from entering the shell. 3.2.5 Dripproof type symbol IPX1 IPX2]
protected against dripping water (code IPX1 IPX21 has a shell, and dripping water should not enter the interior of the appliance when it is dripping vertically or when the appliance is at an angle of 15° relative to the plumb line. 3.2.6 Sprayproof type [symbol IPX3] pratected against spraying water [code IPX3] has a shell, and spraying water at an angle of 60° to the plumb line should not directly enter the interior of the appliance. 3. 2.7 Splashproof type [symbol IPX4] protected against splashing water (code IPX4] With a housing, splashing water from any direction should have no harmful effect on the appliance. 3.2.8 Water-proof type [symbol IPX5] protected against water jets (code IPX5] with shell, water spray from any direction should not have harmful effects on the appliance 3.2.9 Wave-proof type [symbol IPX6] pratected against water heavy seas [code IPX6] with shell, when subjected to violent waves or strong water spray, the amount of water entering the appliance should not reach harmful effects. 3.2. 10 Water-proof type [symbol tPX7] protected against the effects of immersion (code IPX7] with shell, when the appliance is immersed in water at a specified pressure for a specified period of time, the amount of water entering the appliance should not reach harmful effects.
Submersion-proof type (symbol IPX8] protected against submersion [code IPX8] with shell, when the appliance is submerged for a long time under a specified pressure, water should not enter the shell. 3.2.12 Explosion-proof type Explosion-proof electrical appliances have shells that can work normally in explosive media. They can be divided into different explosion-proof grades and types according to the conditions of different media.
3.2. 13 Anti-corrosion type Protected ageinst corrosion type has shells. Electrical appliances can continue to work normally under the action of a certain amount of corrosive gases, steam, salt spray, etc. 3.2.4 Air-tight type Air-hermetic type
has shells. When the gas pressure inside and outside the shell of the electrical appliance is different, the gas inside and outside the shell should not penetrate each other. 3.3 (Mechanical switch electrical appliances) Operation and action 3.3.1 Operation Uperation
The moving parts of the electrical appliance (such as moving contacts) are transferred from one position to another adjacent position. Note: (For switches, this can be a closing operation or a disconnecting operation. ② If you want to distinguish, the operation in the electrical sense, such as connecting or disconnecting, refers to the switch operation, while the operation in the mechanical sense, such as closing or disconnecting, refers to the mechanical operation.| |tt||3.3.2 Operation cycle
Continuous operation of switching from one position to another and then returning to the starting position. If there are multiple positions, all other positions must be passed.
Note: Continuous operations that do not constitute an operation cycle are called operation sequences. 3.3.3 Operation sequence operating sequence Complete the specified continuous operations within a specified time interval. 3.3.4 Control control
Adapt the working conditions of electrical equipment to changing operating requirements. 3.3.5 Manual control manual control
Control operated by human participation.
3.3.6 Automatic control automatic control GB/T 2900. 18—92
Control operated according to predetermined conditions without human participation. Local control Local control
Control operated on or near the controlled switch. 3.3.8 Remote control remote control Control operated far away from the controlled switch. 3.3.9 closing
The operation process of establishing electrical contact between the moving and static contacts of an electrical appliance at a specified position. 3.3.10 opening
The operation process of releasing electrical contact between the moving and static contacts of an electrical appliance at a specified position. making
The operation process of conducting the current in a circuit due to the closing of an electrical appliance. 3.3.12 breaking
The operation process of cutting off the current in a circuit due to the opening of an electrical appliance. 3.3.13 closing operation closing operation The operation of changing an electrical appliance from an open position to a closed position. 3.3.14 opening operation opening operation The operation of changing an electrical appliance from a closed position to an open position. making operation
The operation of changing a switching electrical appliance from an open state to an open state. 3.3.16 breaking operation breaking operation The operation of changing a switching electrical appliance from an open state to a broken state. 3.3.17 Positively opening operation: An operation that ensures that all main contacts are in the disconnected position when the position of the actuator corresponds to the disconnected position of the switch in accordance with the specified requirements.
3.3.18 Positively driven operation: An operation that ensures that the auxiliary contacts of the mechanical switch are in the positions corresponding to the open or closed positions of the main contacts in accordance with the specified requirements.
3.3.19 Dependent manual operation: An operation that relies entirely on the direct application of manpower. The speed and force of the operation are determined by the actions of the operator. Synonyms: direct manual operation
3.3.20 Dependent power operation: An operation that uses energy other than manpower. The completion of the operation is determined by the connectivity of the energy supply (electrical energy, magnetic energy, thermal energy, compressed air or hydraulic pressure, etc.).
Synonyms: direct power operation
Stored energy operation operation An operation that uses the energy stored in the mechanism itself before the operation and is sufficient to complete the operation under predetermined conditions. Note: Energy storage operations can be divided into: energy storage methods (springs, weights, etc.), energy sources (manpower, electricity, etc.); energy release methods (manpower, electricity, etc.). 3.3.22 Independent manual operation An energy storage operation in which the energy comes from manpower and stores and releases energy in a continuous operation. The speed and force of the operation are independent of the operator's actions.
Synonyms: Human energy storage operation
GB/T2900.18—92
3.3.23 Independent power operation An energy storage operation in which the stored energy comes from an external force source and releases the stored energy in a continuous operation. The operating force and speed are independent of the operator's actions
Instantaneous actions 3.3.24
The behavior of an electrical appliance or electrical component immediately performing work after the circuit parameter reaches the action value or receives an action instruction or signal. There is no intentional delay in the action.
3.3.25 Time-delay operation The behavior of an electrical appliance or electrical component performing work after a certain time interval after the circuit parameter reaches the action value or receives an action instruction or signal.
3.3.26 Definite time-delay operation The delayed action time of an electrical appliance is determined by the time setting value and has nothing to do with the current passing through the appliance. 3.3.27
Inverse time-delay operation The delayed action time of an electrical appliance shortens with the increase of the current value passing through the circuit. 3.3.28
Refuse operation 3.3.29 Misaperation The electrical appliance takes an action other than the command. 3.3.30 Auto-reclosing The operation procedure of the electrical appliance automatically closing again after a predetermined time after disconnection. Change-over switching The operation process of the electrical appliance changing the circuit connection, moving the connection from one set of wires to another. 3.3.32 Isolation (isolating function) For safety, the function of cutting off the power supply of the electrical appliance or a part of it by separating the electrical appliance or a part of it from all power sources. The disconnection action of the electrical appliance disconnects the electrical connection between the equipment (including the power supply and the receiving equipment). 3.3.33 Segregation (of conductors) The conductors are separated by grounded metal parts, so that destructive discharge can only occur between the (conductor) and the ground. 3.3.34
Separation(of conductors) Conductors are separated by solid insulation so that destructive discharges cannot occur between them. altracting
The process of closing the armature in an electromagnetic system due to the attraction coil receiving the attraction command. 3.3.36 releasing
The process of returning the armature of an electromagnetic system to its starting position. tripping
The opening action of a mechanical switch caused by a relay or tripper. The process of opening or closing the contacts of an electrical appliance by releasing the locking mechanism that keeps the electrical appliance closed. Trip-free
After the closing operation, when the tripping action occurs, the moving contact can still return and stay in the open position even if the closing command is maintained. 3.3.39 re-setting
All moving parts of an electrical appliance that has been operated return to their starting positions. 3.3.40 Automatic re-setting Automatic re-setting After the energy that causes the electrical device to operate disappears, all the movable parts of the device automatically return to the starting position. 3.3.41 Re-trip
GB/T 2900.18--92
The action of the lock of the electrical device returning to the home position after it has been tripped. Autolocking
The electrical device can lock itself after operation to prevent false operation. 3 Interlocking
The connection between several electrical devices or components to ensure that the electrical devices or their components operate in a specified order or to prevent false operation. 3.3.44 Electrical interlocking Electrical interlocking Interlocking achieved by electrical means.
3.3.45 Mechanical interlocking Mechanical interlocking Interlocking achieved by mechanical means. 3.3.46
Reversible change-over (transition) is the process of changing the power phase sequence on the stator circuit of the motor by switching the main contacts of the electrical appliance to achieve the reverse operation of the motor. Setting
The work of adjusting and determining the action value of the electrical appliance. 3.3.48Actuator
The component that applies external operating force to the operating system. Note: The actuator can be in the form of a handle, hand, button, hydraulic wheel, plunger, etc. 3.3.49 Actuating force [moment] The force [torque] that needs to be applied to the actuator to complete the predetermined operation. Restoring force [moment] 3.3.50 The force (torque) required to return the actuator or contact element to its initial position. Actuating system actuating system transmits the actuating force to all operating components on the contact block of the mechanical switch electrical appliance. Note: The operating mode of the perturbation system can be mechanical, electromagnetic, hydraulic, pneumatic, thermal energy, etc. 3.3.52 Closed position closed position ensures that the contacts in the main circuit of the electrical appliance are in the predetermined energized position. 3.3.53 Open position open position ensures that there is a predetermined overlap between the disconnected contacts in the main circuit of the electrical appliance. 3.3.54 Starting position position a rest The position of a removable part when the appliance is not in operation. Synonyms: rest position
3. 3.55 (of a removable part) Service position (of a removable part) The position in which a removable part is fully connected to perform its intended function. Synonyms: (of a removable part) connected position (of a removable part) 3. 3. 56 (of a removable part) Earthing position (of a removable part) The position of a removable part that can short-circuit a main circuit and ground it when the appliance is closed. (of a removable part) Isolated position (of a 3.3.57
The position of a withdrawable part that can keep an appropriate isolation distance between all circuits of the withdrawable part or be in a separated state and can still maintain mechanical connection with the device.
3.3.58 Test position (of a withdrawable part) The position of a withdrawable part that can keep an appropriate isolation distance between the main circuit and other parts or be in a separated state with other parts and can connect the auxiliary circuit.
3.3.59 Closed traasition The circuit is designed so that when the switch [starter] is switched from one level to another, the current flowing to the motor will not be interrupted even if it is instantaneous.
3.3.60 Open transition open transition GB/T 2900. 18—92
The circuit is designed so that when the switch [starter] switches from one stage to another, the current flowing to the motor is interrupted at the moment of switching.
3.4 ​​Duty
3.4.1 8-hour duty The conductive circuit of the appliance is passed through a steady current (for appliances with contacts, the contacts remain closed; for appliances with operating coils, the operating coils must be energized), and the energization time is long enough to achieve thermal equilibrium, but it must be interrupted if it exceeds 8 hours.
3.4.2 Uninterrupted duty The conductive circuit of the appliance is passed through: a steady current (for appliances with contacts, the contacts remain closed; for appliances with operating coils, the operating coils must be energized), and the energization time exceeds 8 hours (several weeks or months) and is not interrupted. Synonym. Long-term duty
3. 4.3 Short-time duty short-time duty temporary duty A duty in which the load time and the no-load time alternate, and the former is shorter than the latter. A steady current is passed through the conductive circuit of the appliance (for appliances with fused contacts, the contacts remain closed; for appliances with operating coils, the operating coils must be energized). The energization time is not enough for the appliance to reach thermal equilibrium, but the time interval between two energizations is enough for the temperature of the appliance to return to the temperature of the surrounding air. 3. 4. 4 Intermittent periodic duty A steady current is passed through the conductive circuit of the appliance (for appliances with contacts, the contacts remain closed; for appliances with operating coils, the operating coils must be energized). The energization time and the no-energization time alternate in a certain ratio. Because the working cycle is so short, the appliance cannot reach thermal equilibrium.
Synonym: intermittent duty
3.4.5 Rated duty
Duty that meets certain electrical design intentions3.4.6 Periodic dutyDuty that is always performed regularly and repeatedly regardless of load changes. 3.4.7 Frequency of operationThe number of possible operating cycles of a switching device per hour. 3. 4. B Load factorThe ratio of the on-load time of an electrical device to its duty cycle (the duty cycle is the sum of the on-load time and the off-load time in each operation), usually expressed as a percentage.
Synonym: On-duty cycle
3.4.9 Inching joggingInching or jogging a motor or coil circuit multiple times in a very short time to make the driven mechanism move a little. Synonym, inching
3.4.10 Reverse braking and reverse plugging When the motor is running, the motor is stopped or reversed by reversing the phase sequence of the motor stator winding. 3.4.11 Utilizationcategory A number of regulations and requirements related to the conditions under which the switch or fuse completes its function, which represent the actual use characteristics. For switch devices, it refers to a combination of relevant working condition requirements. Usually, the multiples of the rated working current, the multiples of the rated working voltage and their corresponding power factor or time constant are used to characterize the category of the device's ability to make and break. 3.5 Contact and connection
3.5.1 Electrical contactGB/T 2900.18--92
The state of conduction achieved by two conductors in contact with each other. Point contact
3. 5. 1. 1
The electrical contact between two conductors is a point. 3. 5-1.2
Line contact
The electrical contact between two conductors is a line. 3.5.1.3Surface contactThe electrical contact between two conductors is a surface. 3.5.1.4Butt contact
The electrical contact between the moving and stationary contacts is perpendicular to the contact surface. 3.5.1.5Rolling contactThe electrical contact between the moving contact and the stationary contact rolls along the surface of the stationary contact. 3.5.1.6Sliding contactThe electrical contact between the moving contact and the stationary contact slides parallel to the contact surface along the relative movement direction of the stationary contact. 3.5.2 Connection connectionbZxz.net
The mutual fastening connection of electrical components connected to external conductors. 3.5.2.1 Fixed contact connection fixed contact connection A connection method that uses fasteners to fix to achieve electrical contact. 2 Removable contact connection removable contact connection 3.5.2.2
A connection method that uses movable elastic structure contact to achieve electrical contact. 3.5.2.3 Flexible connection The part connected with a flexible conductor in the circuit, which has the form of sheet and braid. 4 Product name
4.1 Low-voltage circuit breaker
4.1.1 (Mechanical) circuit breaker circuit-breaker (machanical) A mechanical switch electrical appliance that can connect, carry and disconnect the current under normal circuit conditions, and can also connect, carry a certain time and disconnect the current under specified abnormal circuit conditions (such as short circuit). Formerly known as: automatic switch
4.1.2 Universal circuit breaker Canventional circuit-breaker Circuit breaker with a frame structure base with insulating pads to form all components as a whole and with a variety of structural variations and uses.
Formerly known as: frame type automatic switch
4.1.3 Moulded case circuit breaker A circuit breaker with a shell made of molded insulating material to assemble all components into a whole. Synonyms: molded case circuit breaker
Formerly known as plastic case automatic switch
4.1.4 Current-limiting circuit breaker Current-limiting circuit breaker A circuit breaker with a breaking time short enough to break before the short-circuit current reaches its expected peak value. 4.1.5 Plug-in type circuit breaker Plug-in type circuit breaker A circuit breaker with plug-in contacts (or contact seats) on the wiring terminals to enable insertion of corresponding static contact seats (or contacts) and connection with external wires.
4.1.6 Withdrawable circuit breaker GB/F2900.18—92
It is a kind of plug-in circuit breaker. When inserted, there is a special circuit breaker support mechanism, which can support the circuit breaker even if the plug-in contacts are in the separated position, and ensure a safe isolation distance. The withdrawable circuit breaker should generally have two positions: connection, test, and isolation.
4.1.7 Integrally-fused circuit breaker A single electrical appliance composed of a circuit breaker and a fuse, each phase of which is composed of a fuse and one pole of the circuit breaker in series. 4.1.8 Lock-out circuit breaker with lock-out preventing closing A circuit breaker in which the moving contact will not connect the current even if a closing command is issued if the conditions that lead to the disconnection operation continue to exist. 4.1.9 Air circuit breaker Air circuit-breaker A circuit breaker whose contacts open and close in free air. 4.1.10 Vacuum circuit breaker A circuit breaker whose contacts open and close in a high vacuum shell. 4.1.11 Field discharge circuit breaker A circuit breaker used to connect and disconnect the motor excitation circuit. 4.1.12 High speed circuit breaker A DC circuit breaker whose disconnection time is short enough to disconnect before the short-circuit current reaches its maximum value. 4.2 Low-voltage air isolators, switches, disconnectors and fuse combination appliances 4.2.1 (Mechanical) switch switch (mechanical) A mechanical switching appliance that can connect, carry and disconnect current under normal circuit conditions (including specified overload working conditions), and can carry current under specified abnormal circuit conditions (such as short circuit) and within a specified time. Note: A switch can only connect but not disconnect short-circuit current. 4.2.2 Isolator (isolalor) A mechanical switch that meets the specified isolation requirements in the disconnected position. Note: An isolator can disconnect or close a circuit if the current to be disconnected or connected is negligible or if the voltage across each pole of the isolator does not change significantly (when disconnecting or connecting the current). It can carry the current under normal circuit conditions and can also carry the current under abnormal circuit conditions (such as short-circuit current) for a specified period of time. 4.2.3 Isolator switch-disconnector A switch that meets the isolation requirements specified for isolators in the disconnected position. 4.2.3.1 Fuse-switch-disconnector A type of isolator with a fuse or a fuse-carrying element with a fuse as the moving contact. 4.2.4 Knife switch
A switch with a knife-shaped moving contact that is wedged with the static contact on the base in the closed position. 4.2.5 Fuse-combination unit A combination unit in which a mechanical switch and one or more fuses are assembled in the same unit by the manufacturer or according to its instructions. Jiang: Some fuse combination units have a striker release mechanism. When the striker is actuated, all poles of the associated mechanical switchgear can be disconnected.
4.2.5.1 Switch-fuse A switch-fuse is a combination unit consisting of one or more poles of a (knife) switch connected in series with a fuse that can be operated with a load. Synonym: load switch
4.2.5.2 Disconnector-fuse A combination unit consisting of one or more poles of an isolator connected in series with a fuse. Synonym: Disconnector with fuse
4.2.5.3 Fuse-switch A switch whose static contact is fixed on the base or plug socket and whose moving contact is composed of a fuse or a fuse-carrying fuse.
Synonym: Fuse-knife switch
GB/T 2900. 18—92
4.2.5.4 Fuse-disconnector A disconnector whose moving contact is composed of a fuse or a fuse-carrying fuse. 4.2.5.5 Disconnector-fuse A combination of a disconnector and a fuse connected in series with one or more poles. 4.2.6 Change-overswitch A switch used in a circuit to switch from one set of connections to another. A knife-type change-over switch is used. The switch with tongue [cam] structure is called lip [cam] type switch.
The switch with push-type contact elements combined into a rotary operation is called a combination switch. 4.2.7 Two direction switch has three positions, which can connect, reverse and disconnect the motor stator winding to make a single asynchronous motor forward, reverse and stop.
Synonym two-way switch
4.3 Electrical appliances for household and similar places
4.3.1Circuit-breakers for household and sinilar installations ... 4.3.2 Residual current operated protective devices A mechanical switch or combination device that can automatically disconnect the circuit under specified conditions when the residual current reaches or exceeds the set value.
Note: A residual current protector can also be composed of various independent components used to detect and judge the residual current and connect and disconnect the current.
4.3.3 Time-delay residual current protective device A residual current gate current protector that can reach a predetermined limit non-operation time corresponding to a specified residual leakage current value.
4.3.4 Residual current circuit breaker breakel A circuit breaker that can automatically disconnect the circuit when the residual [leakage current in the circuit reaches or exceeds the set value under specified conditions. 4.3.5 Residual [leakage current operated protective relay residual current operat cd protective relay A relay that is operated by a current transformer when the residual [leakage] current is not detected and when the residual [leakage] current reaches or exceeds the set value under specified conditions.
4.4 Low-voltage contactors and motor starters
4.4.1 (Mechanical) Contactor contactor (mechanical) An instrument with a starting position that can connect, carry and disconnect currents under normal circuit conditions (including overload operating conditions) is a non-manually operated mechanical switching device.
Note: The contactor can be designed according to the force required to close the main contacts. 4.4.2 Alternating current contactor A contactor used in AC circuits.
4.4.3 Direct current contactor direct current contactar A contactor used in DC circuits.
4.4.4 Air contactor A contactor in which the closing or opening of the contacts is carried out in the air. GB/T 2900. 18—92
4.4.5 Electromagnetic contactor A contactor in which the main contacts are closed or opened by the force generated by the electromagnet. 4.4.6 Pneumatic contactor A contactor in which the main contacts are closed or opened by the force generated by the compressed air device. Electromagnetic pneumatic contactor Electromagnetic pneumatic contactor4.4.7
A contactor in which the main contacts are closed or opened by the force generated by the compressed air device controlled by the solenoid valve. 4.4.8 Electro-pneumatic contactor Electro-pneumatic contactor A contactor in which the main contacts are closed or opened by the force generated by the compressed air device through an electrically controlled valve. 4.4.9 Latched contactor A contactor in which the movable part moves when the operating mechanism is energized, and the latching device prevents the movable part from returning to the starting position when the operating mechanism loses energy. Note: ① The latching and releasing of the latching mechanism can be mechanical, magnetic, electrical, pneumatic, etc. ② Due to the latching mechanism, it actually has two starting positions. If it is strictly defined as a contactor, it cannot be called a contactor. However, it is closer to a contactor in terms of use and design, so it is more appropriate for it to comply with the contactor standards in all occasions. 4.4. 10 Intermediate frequency contactor A contactor used in intermediate frequency circuits
Vacuum contactor or starter 4.4. 11
A contactor or starter in which the main contacts are opened and closed in a high vacuum shell. 4.4.12
Semiconductor contactorAn electrical appliance that uses semiconductor switching devices to complete the contactor function. Note: Semiconductor contactors may also include mechanical switching devices. Synonym: solid-state contactor
4.4.13Starterstarter
A combination of all the switching devices required to start and stop the motor and appropriate overload protection devices. Note: The starter can be set according to the force required to close the main contacts. Direct-on-line starter4.4.14
A starter that applies the circuit voltage directly to the motor terminals to start it at full voltage. 4.4.15Electromagnetic starterAn electromagnet that generates dust when the force to close the main contacts is used. A starter composed of an electromagnetic contactor and overload protection components. 4.4.16 Reversing starter A starter that reverses the direction of rotation of the motor by reversing the stator connection while the motor is running. 4.4.17 Manual starter A starter in which the force required to close the main contacts is entirely generated by human power. 4.4.18 Motor operated starter A starter in which the force to close the main contacts is generated by a motor. 4.4.19 Pneumatic starter A starter in which the force to close the main contacts is generated by a compressed air device rather than by electricity.
4.4.20 Electro-pneumatic starter A starter in which the force to close the main contacts is generated by a compressed air device controlled by an electric valve. 4.4.21 Star-delta starter A starter that changes the connection of the stator winding of a three-phase squirrel cage asynchronous motor, connects in star at start and changes to delta at run time to reduce the starting current. GB/T 2900. 18-92
4.4.22 Auto-transformer starter A starter that extracts one or more taps from the autotransformer to reduce the terminal voltage of the asynchronous motor at start, thereby reducing the starting current.
4.4.23: Two-step auto-transformer starter A starter with only one intermediate acceleration position between the stop position and the running position. 4.4.24 Theostatic starter A starter that uses one or more resistors to obtain the torque characteristics and (or) limit the current when the motor is started, including mechanical switching devices for cutting off the resistors. It usually consists of the following three basic components: a. Mechanical switching device for stator power supply (usually equipped with overload protection device): b. Resistors connected to the stator or rotor circuit, and mechanical switching devices for sequentially cutting off the resistors. These basic components can be provided in combination or separately, and then connected at the place of use. 4.4.25 Rheostatic rotorstarter A rheostatic starter that sequentially cuts off one or more resistors pre-connected in the rotor circuit of a wound-rotor induction motor during starting.
4.4.26 Single-step starter A starter with no intermediate acceleration position between the disconnection and full start positions. Note: A single-step starter is a direct starter. Two-step starter
4. 4. 271
A starter with only one intermediate acceleration position between the stop position and the running position. 4. 4.28 n-step starter n-step starter A starter with n-1 acceleration positions between the disconnect and full start positions. Combined starter
A device that combines fuses, contactors, overload protection elements, etc., used to protect the motor from overload, short circuit or undervoltage during the starting process.
4.4.30 Controller controller
A switch that switches the wiring of the main circuit or control circuit in a predetermined sequence and changes the parameters in the circuit. Cam controller camcontroller
A controller that uses a cam to operate the movement of the moving contact. 4.4.32 Plane controller faceplatecontroller A controller with a plane conversion device in which the moving contact moves relative to the stationary contact group arranged on a plane. 4.4.33 Drum controller drumcontroller A controller with a drum conversion device in which the moving contact group is arranged along a cylindrical surface. 4.5 Control circuit electrical appliances and switch (or release) elements 4.5.↑ (Electrical type> Relay: relay (electrical) When the change of the electrical excitation quantity [input quantity of the control appliance in the circuit reaches the specified requirement, the switching appliance causes the controlled object to undergo a predetermined step change in one or more electrical output circuits of the appliance. 4.5.2 Control relay control relay
A relay used as a control and protection circuit or signal conversion in an electric drive system 4.5.3 AC relay ac, relay
A control relay with an AC input signal. DC relay dc, relay
A control relay with a DC input signal.
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