HKel Electrical Appliances (Shanghai) Co., Ltd. is a professional low-voltage electrical appliances OEM licensing production and sales as one of the enterprises. Hangkai Professional Molded Case Circuit Breaker Manufacturer, mainly produces HKM1 Molded Case Circuit Breaker, HKM3 Molded Case Circuit Breaker, providing product maintenance, type selection, knowledge and other services. Tel: 021-57161889
MoreAs the derivation and supplement of circuit breaker function, the accessory of plastic case circuit breaker (hereinafter referred to as circuit breaker) adds control means and enlarges protection function for circuit breaker, making the use of circuit breaker wider, the protection function more complete, and the operation and installation mode more. Therefore, at present, the accessory of circuit breaker has become an integral part of circuit breaker.
1. Common types of accessories for plastic case circuit breakers: they are classified into two categories: internal accessories and external accessories.
(1) The accessory in the machine is an accessory device installed in the circuit breaker, which includes four kinds: excitation release, undervoltage release, auxiliary switch and alarm switch. Usually the accessory inside the machine must be opened and installed, but at present, the accessory of the new circuit breaker adopts modular structure, and its installation and replacement need not be opened, thus ensuring the reliability of the circuit breaker and bringing convenience to users.
(2) External accessories are accessory devices installed outside the circuit breaker, including auxiliary handles, external operating handles, electro-operation mechanism, handle locking device, mechanical interlocking device, electrical interlocking device, post-board wiring device, insertion mounting table and auxiliary contact device.
2. Accessories indicating the status of plastic case circuit breakers:
Auxiliary switches and alarm switches are both in-machine accessories used to display the current state of circuit breakers. The difference between auxiliary switch and alarm switch is that:
(1) Auxiliary switch is to change the state when the circuit breaker is switched on or off. It can show the switching state and the switching state of the circuit breaker, but it can not distinguish whether the circuit breaker is a fault trip. Therefore, the auxiliary switch is mainly used to display the switching state of the circuit breaker. It controls or interlocks other related electrical appliances through the switching of the circuit breaker, such as signal lights, relays and logic circuits. Output signal.
(2) The alarm switch changes the state when the circuit breaker is disconnected due to the fault, and can display the state of the circuit breaker when it is disconnected due to the fault. The alarm switch is mainly used to display the state when the circuit breaker is disconnected due to the fault. When the load of the circuit breaker fails, the alarm device, signal lamp, relay and logic circuit outside the circuit breaker are controlled or interlocked in time, such as the alarm device, signal lamp, relay and logic circuit outside the circuit Equal output signal.
(3) In short, whether it is auxiliary switch or alarm switch, it can only detect the state of the main contact of circuit breaker, but can not change its state.
Plastic Case Circuit Breaker Auxiliary Switch
Plastic case circuit breaker alarm switch
3. Accessories for realizing undervoltage protection function of circuit breakers:
(1) Undervoltage tripper is a protective accessory. When the power supply voltage drops to 35%-70% of the rated voltage of undervoltage tripper, undervoltage tripper can make circuit breaker tripping.
Molded case circuit breaker undervoltage tripper
(2) When the power supply voltage is lower than 35% of the rated voltage of the undervoltage tripper, the undervoltage tripper can ensure that the circuit breaker does not close.
(3) When the power supply voltage is higher than 85% of the rated voltage of the undervoltage tripper, the undervoltage tripper can ensure the normal operation of the circuit breaker.
Therefore, when a certain voltage drop occurs in the power supply of the protected circuit, the circuit breaker can be automatically disconnected to cut off the power supply, so that the load electrical apparatus or electrical equipment below the circuit breaker can be protected from under-voltage damage.
For example, motor load, control circuit, etc. Undervoltage tripper has a variety of rated working voltage and different power supply frequency, which can be used in different occasions and different power supply.
Note: Users must specify when ordering.
4. Accessories for realizing the operation function of plastic case circuit breaker:
Accessories to realize the operation function of circuit breaker include: excitation tripper, electric operation mechanism, auxiliary handle and external operation handle, etc.
(1) Excitation tripping device is an accessory to realize long-distance switching of circuit breaker. When the applied voltage of the excitation tripping device is 70%~110% of the rated control voltage of the excitation tripping device, the circuit breaker can be reliably broken. Usually, the shunt tripper is used for long-distance switching operation of circuit breaker in emergency state and as an actuator of protective relays such as leakage relays. At present, it is mostly used in the open-door power-off protection circuit of distribution cabinet.
塑壳断路器分励脱扣器
Note:
There are also many rated control voltages and different power supply frequencies for different occasions and different power supply.
(2) Electrical operation mechanism is also an external accessory for long-distance operation of circuit breakers, which can be used to realize both long-distance opening operation and closing operation of circuit breakers.
A. When the circuit breaker is released freely due to the fault, it should be first switched off once so that the circuit breaker can be re-switched, and then the closing operation can be carried out.
B. If the alarm switch or auxiliary switch of the circuit breaker is used, when the circuit breaker is released freely (caused by man-made or overload, etc.), the alarm switch or auxiliary switch will automatically turn on the switch-off operation circuit of the electric operation mechanism immediately, and the electric operation mechanism will immediately switch-off operation, so that the circuit breaker can be re-switched, so as to ensure the long-distance "close" and "open" operation of the circuit breaker. Do.
C. There are two kinds of electric and electromagnetic operating mechanisms: electric operating mechanism is driven by motor, which is generally suitable for the operation of large capacity circuit breakers of 400A and above; electromagnetic operating mechanism is driven by electromagnet, which is suitable for small capacity circuit breakers such as 100A and 225A.
(3) Auxiliary handle is an exterior lengthened handle which is directly mounted on the handle of circuit breaker. It is generally used on large capacity circuit breakers of 600A and above for manual opening and closing operation.
(4) External operating handle is an external accessory with the function of converting upper and lower pulling operation of circuit breaker into rotary operation. It has many forms such as counterclockwise or clockwise closing, which makes circuit breaker more suitable for various operation needs of users.
A. External operating handles are knob type and gun type.
B. The knob-type external control handle is directly installed on the circuit breaker, and the handle is exposed outside the panel or drawer of the distribution cabinet; the operation mechanism of the gun-type external control handle is installed on the circuit breaker, the circuit breaker is installed on the bottom board of the distribution cabinet, and the panel of the external control handle is installed on the door of the distribution cabinet.
C. The length of the handle shaft of the gun type external control handle can be adjusted. The manufacturer has a variety of lengths and sizes to choose from.
Whether the circuit breaker is installed vertically or horizontally on the left and right sides, the external operating handle can indicate the breaking and closing state of the circuit breaker in the same direction.
You may be interested in:
Selection and Installation of Molded Case Circuit Breaker
Explanation of Specification Type Meaning of Plastic Case Circuit Breaker of Hangkai Electric Appliance
How to choose plastic case circuit breaker?
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