1. Types of accessories for molded case circuit breakers

two types: internal accessories and external accessories.

In-machine accessories are auxiliary devices installed inside the molded case circuit breaker, including shunt release, under-voltage release, auxiliary switch and alarm switch. External accessories are accessories installed outside the molded case circuit breaker, including auxiliary handles, external operating handles, electric operating mechanisms, handle locking devices, mechanical interlocking devices, electrical interlocking devices, rear wiring devices, plug-in installations Stations and auxiliary contact devices, etc.

2. Accessories that indicate the status of molded case circuit breakers

The difference between  auxiliary switch and alarm switch is:

The auxiliary switch is mainly used to display the opening and closing status of the molded case circuit breaker. Through the opening and closing of the molded case circuit breaker, other related electrical appliances are controlled or interlocked. The alarm switch is mainly used when the molded case circuit breaker is disconnected due to a fault. Status display, timely implementation of control or interlocking to other related electrical appliances when the plastic case circuit breaker load fails.

3. Accessories to realize the undervoltage protection function of molded case circuit breakers

The 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 trip the molded case circuit breaker; when the power supply voltage is lower than the undervoltage release When the rated voltage of the voltage release is 35, the undervoltage release can ensure that the molded case 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 that the molded case opens The device is working normally.

4. Accessories for realizing the operation function of molded case circuit breaker

(1) The shunt release is an accessory that realizes the remote opening of the molded case circuit breaker. It is usually used for remote opening of the molded case circuit breaker in an emergency state and as a leakage relay and other protective electrical appliances. element.

(2) The electric operating mechanism is also an external accessory for remote operation of the molded case circuit breaker, which can be used to realize the remote opening operation of the molded case circuit breaker as well as the closing operation of the molded case circuit breaker.

(3) The auxiliary handle is generally used on large-capacity molded case circuit breakers of 600A and above for manual opening and closing operations.

(4) The external operating handle is an external accessory with the function of converting the up and down operation of the molded case circuit breaker into a rotary operation.