The working principle of small circuit breakers is the same as the plastic case circuit breaker -- commonly known as the air circuit breaker structure: the arc extinguishing system: the static contact contact mechanical system, the base lock buckle and the bending needle, and so on: the thermal element; the working principle of the coil iron core:
1. over current protection principle - the circuit breaker thermal components Metal sheet) the contact of the mechanical part of the traction machine after the heat is heated to one side;
2. short circuit protection principle - when the large current flows through the circuit breaker, the coil changes the magnetic field to touch the iron core traction machine part to break the contact contact.
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