Circuit breaker
Low-voltage

Low-voltage (less than 1,000 V) types are common in domestic, commercial and industrial application, and include:

The characteristics of low-voltage circuit breakers are given by international standards such as IEC 947. These circuit breakers are often installed in draw-out enclosures that allow removal and interchange without dismantling the switchgear.

Large low-voltage molded-case and power circuit breakers may have electric motor operators so they can open and close under remote control. These may form part of an automatic transfer switch system for standby power.

Low-voltage circuit breakers are also made for direct-current (DC) applications, such as for subway lines. Direct current requires special breakers because the arc is continuous—unlike an AC arc, which tends to go out on each half cycle, a direct-current circuit breaker has a blow-out coil that generates a magnetic field that rapidly stretches the arc. Small circuit breakers are either installed directly in equipment or arranged in breaker panels.

The DIN-rail -mounted thermal-magnetic miniature circuit breaker is the most common style in modern domestic consumer units and commercial electrical distribution boards throughout Europe. The design includes the following components:
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