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How circuit breakers work

The interior of the circuit-breaker generally consists of a contact system, an arc-quenching system, an operating mechanism, a release and a housing. The circuit breaker works as follows
1. When a short circuit occurs, the magnetic field generated by the high current (generally 10 to 12 times) overcomes the reaction force spring, the release pulls the operating mechanism into action and the circuit breaker trips instantaneously.
2. When overloaded, the current becomes greater, the heat generation increases, and the bimetallic sheet deforms to a certain extent to promote the action of the mechanism, causing the switch to trip; the greater the current, the shorter the action time.
3. There is an electronic type which uses the transformer to collect the current of each phase and compares it with the set value. If the current is abnormal, the microprocessor sends a signal to cause the electronic trip unit to operate the operating mechanism.