Low-Voltage Circuit Breakers: Also known as automatic air switches or automatic air circuit breakers-and simply referred to as "circuit breakers"-these are electrical devices that serve the dual function of acting as a manual switch while also providing automatic protection against voltage loss, undervoltage, overload, and short circuits. They are utilized to distribute electrical energy, to start asynchronous motors infrequently, and to provide protection for power supply lines, motors, and similar equipment. In the event of severe faults-such as overload, short circuits, or undervoltage-they automatically interrupt the circuit. Functionally, they are equivalent to a combined assembly of a fuse-type switch, overload relays, undervoltage relays, and thermal relays. Furthermore, they generally do not require the replacement of components after interrupting a fault current, and as a result, they have gained widespread application.
1) Circuit Breaker Accessories
2) Miniature Circuit Breakers (MCB): Miniature Circuit Breakers-abbreviated as MCBs-are the most widely used type of terminal protection device within the terminal power distribution systems of buildings.
3) Molded Case Circuit Breakers (MCCB): Molded Case Circuit Breakers are capable of automatically interrupting the current whenever the current magnitude exceeds a preset trip threshold. The term "molded case" refers to the use of an insulating plastic enclosure to house the device, serving to electrically isolate the internal conductors from one another as well as from grounded metal components. MCCBs typically incorporate thermal-magnetic trip units, while larger models are often equipped with solid-state trip sensors.
4) Air Circuit Breakers (ACB) / Frame Circuit Breakers
5) Intelligent Universal Circuit Breakers