Electricity Knowledge Sharing: Basic Knowledge Of Miniature Circuit Breaker

Miniature circuit breaker is the most widely used terminal protection electrical appliance in the building electrical

terminal power distribution device. It is used for single-phase and three-phase short-circuit, overload, overvoltage

protection under 125A, including single-pole 1P, two-pole 2P, three-pole 3P, and four-pole 4P.

In the electrical design of civil buildings, miniature circuit breakers are mainly used for line overload, short circuit,

over current, loss of voltage, under voltage, grounding, leakage, automatic switching of dual power supplies, and

protection and operation of motors when they are not frequently started.