Low-voltage circuit breakers: Also known as automatic air switches or automatic air circuit breakers, or simply circuit breakers. They are electrical appliances that provide both manual switching functionality and automatic protection against undervoltage, overload, and short-circuit faults.
They are used to distribute electrical energy, infrequently start asynchronous motors, and protect power lines and motors. When severe overloads, short circuits, or undervoltage faults occur, they automatically disconnect the circuit, functioning similarly to a combination of a fuse switch and over/under-temperature relays. Furthermore, they generally do not require component replacement after interrupting a fault current, leading to their widespread application.
1) Circuit breaker accessories
2) Miniature circuit breakers: Miniature circuit breakers (MCBs) are the most widely used terminal protection devices in building electrical distribution systems.
3) Molded case circuit breakers: Molded case circuit breakers automatically interrupt current after the current exceeds the trip setting. The "molded case" refers to the use of plastic insulators as the outer shell of the device to isolate conductors and grounded metal parts. Molded case circuit breakers typically contain a thermomagnetic trip unit, while larger molded case circuit breakers are equipped with solid-state trip sensors.
4) Frame circuit breakers
5) Intelligent universal circuit breakers
