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How a Conventional Circuit Breaker works? Circuit breaker operation

Conventional circuit breakers work by a mechanical means. Current flowing through the breaker heats a bi-metallic current sensor, causing it to bend. When the amount of this bending exceeds a limit, an armature is released and a spring forces the contacts to open. The load current also flows through a magnetic current sensor that creates a magnetic field that trips the armature faster than the bi-metal strip can respond when very large currents flow through the breaker.

Disclaimer: As obtained from the Internet