A circuit breaker is a protection switch that automatically cuts off faulty lines. It can be used to switch on and off normal load current, motor operating current and overload.

The current can also be used to turn the short-circuit current on and off. Under normal conditions, it can also be used to turn the circuit on and off infrequently and to control the start and stop of the motor.

The circuit breaker has the functions of adjustable action value, overload and protection, easy installation and strong breaking ability. Especially after breaking the fault current, it is generally unnecessary to replace the components. Therefore, the circuit breaker has been called automatic switch. A mechanical switching device that can be turned on, carried, and disconnected from a circuit that can also be turned on under specified abnormal circuit conditions (such as a short circuit), carrying a certain amount of time, and breaking current.

According to the specified conditions, the power distribution circuit, motor or other electrical equipment is operated on and off and protects, that is, when there is overload, short circuit or under voltage in the circuit, the switching device of the circuit can be automatically disconnected.

Classified by operation mode, the circuit breaker can be divided into manual operation (manual) and no manual operation (electric, energy storage) according to the operation mode.

Classified by the number of poles, the circuit breaker can be divided into single pole, two pole, three pole and four pole.

Classified according to the installation method, the circuit breaker can be divided into fixed type, plug-in type and drawer type according to the installation method.

According to the classification of arc extinguishing media, the road breaker can be divided into air type and vacuum type according to the arc extinguishing mode. At present, the domestic circuit breaker has more air type.

According to the arc extinguishing technology classification, the circuit breaker can be divided into two types: arc extinguishing type and current limiting type according to the arc extinguishing technology adopted.

1 Zero arc extinguishing type can make the arc that is pulled open by the contact extinguish when the alternating current naturally crosses zero.

2 Current-limiting type can know the peak expected short-circuit current. A small cut-off current is classified according to the purpose. According to the application, the circuit breaker can be divided into power distribution, motor protection, household and similar places, and residual current (leakage) protection. Use, special use, etc.

DC molded case circuit breaker is suitable for DC power supply circuit with rated voltage up to DC1000V and different rated current. DC molded case circuit breaker has overload long delay protection and short circuit instantaneous protection function.

DC molded case circuit breakers are used to distribute electrical energy and protect lines and power equipment from overload, short circuit and other faults.

DC molded case circuit breaker can also be used in solar power generation system. The working voltage can reach up to DC1000V, which can quickly break the fault current of DC power distribution system and protect the important components in solar power system - photovoltaic module from DC side reverse current and The harm of the AC side feedback current caused by the inverter failure, the DC molded case circuit breaker ensures the reliable operation of the solar photovoltaic power generation system. The operating mechanism of the DC molded case circuit breaker has the functions of quick closing and fast breaking, compact structure, small size and convenient use.