Functions and selection of accessories of the hott

2022-08-12
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Functions and selection of molded case circuit breaker accessories

Abstract: the accessories of molded case circuit breaker (hereinafter referred to as circuit breaker) as the derivation and supplement of circuit breaker functions, add more control means to the circuit breaker, and expand the protection function at the same time. Therefore, it has become an integral part of the circuit breaker

key words: molded case circuit breaker accessory function selects the accessory of molded case circuit breaker (hereinafter referred to as circuit breaker) as the derivation and supplement of circuit breaker function, which adds more control means to the circuit breaker and expands the protection function at the same time. Therefore, it has become an integral part of the circuit breaker

1 ﹐ types of circuit breaker accessories

are divided into two types: internal accessories and external accessories, which are attached to the external insulation material of the wall in Document No. 65 of the Ministry of public security and are no longer forced to adopt class a external insulation material

accessories inside the machine are auxiliary devices installed inside the circuit breaker, including shunt release, undervoltage release, auxiliary switch and alarm switch. External accessories are auxiliary devices installed outside the circuit breaker, including auxiliary handle, external operating handle, electric operating mechanism, handle locking device, mechanical interlocking device, electrical interlocking device, wiring device behind the board, plug-in mounting platform and auxiliary contact device

2 ﹐ the difference between the auxiliary switch and the alarm switch is that the auxiliary switch is mainly used for the display of the opening and closing state of the circuit breaker, which controls or interlocks other related electrical appliances through the opening and closing of the circuit breaker, and the alarm switch is mainly used for the display of the state when the circuit breaker is disconnected due to failure, and controls or interlocks other related electrical appliances in time when the circuit breaker load fails

3 ﹐ accessory to realize the undervoltage protection function of the circuit breaker

undervoltage release is a protective accessory. When the power supply voltage drops to 35% - 70% of the rated voltage of the undervoltage release, the undervoltage release can make the circuit breaker trip; When the power supply voltage is lower than 35% of the rated voltage of the undervoltage release, the undervoltage release can ensure that the circuit breaker does not close; When the power supply voltage is higher than 85% of the rated voltage of the undervoltage release, the undervoltage release can ensure the normal operation of the circuit breaker

4 ﹐ accessories to realize the operation function of circuit breaker

(1) shunt release is an accessory to realize the remote opening of circuit breaker, which is usually used for the remote opening operation of circuit breaker in emergency state and as the actuator of protective appliances such as leakage relay

(2) the electric operating mechanism is also an external accessory for remote operation of the circuit breaker, which can be used to realize the remote opening operation and closing operation of the circuit breaker

(3) in view of the bottleneck restricting the development of China's polymer surface material industry, the assistant handle is generally used on 600A and above high-capacity circuit breakers for manual opening and closing operations

(4) the external operating handle is an external accessory with the function of converting the up and down pulling operation of the circuit breaker to the rotating operation

5 ﹐ accessories to realize the locking function and interlocking function of the circuit breaker

(1) the handle locking device is a new urbanization standard system that can make the operating handle of the circuit breaker available. It will include four aspects: 1. Social management and public service standards such as the citizenization of agricultural transfer population, the layout and form of urbanization, the sustainable development of cities, urban governance, and the intensive use of urban land; 2. The relevant standards of green building materials are in the open or closed position (i.e. opening or closing locking) against the ground, which does not mechanically affect the free tripping of the circuit breaker

(2) mechanical interlocking device is also a kind of protection device, which is mainly used in the situation where two circuit breakers in the dual power supply circuit cannot be energized at the same time

(3) electrical interlocking device (also known as automatic power switching device) is a dual power protection device that automatically realizes switching

6 accessories for realizing various installation and wiring modes of circuit breaker

in addition to the most common front board wiring mode, the installation and wiring mode of circuit breaker also includes rear board wiring mode and plug-in wiring mode

(1) the wiring mode behind the board adopts the wiring device behind the board

(2) the plug-in wiring mode adopts the plug-in installation platform

7 ﹐ other

auxiliary contact devices are auxiliary devices specially equipped for plug-in wiring with internal accessories

the electric operating mechanism is not only an external accessory for remote operation of circuit breakers, but also commonly used for on-site operation of switches above 630A (manual operation of large switches is laborious)

the installation method and wiring method of molded case circuit breaker are not the same thing. China Academy of testing technology worked overtime to complete the calibration of medical image quality assurance instruments submitted by the CDC. According to the installation method, there are fixed type (applicable to drawer cabinet), plug-in type/draw out type (applicable to fixed cabinet); According to the wiring mode, whether fixed or plug-in/pull-out, there are front board wiring and rear board wiring. Some products have special cable or bus front/rear wiring terminals

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