The function of the motor circuit breaker is the protection, because it interrupts the passage of the current when overload occurs, this will happen with a thermal trip. Overloading occurs when a current exceeds the nominal current over a prolonged period, damaging the cable and the equipment.
The protection provided by the circuit-breakers saves costs, physical space and enables a quick reaction condition in the event of short circuits, turning off the engine in a matter of milliseconds.
The motor circuit breaker protects the main circuit, and combines control and protection in a single device. They work to turn the electric motors on and off manually, and ensures protection against short circuits, overload and phase failure.
Circuit breakers are reclosable and do not require replacement and can be used as a session key. They have high interruption capacity and even in installations with high short-circuit current can be used, ensuring total protection. It must be set to the nominal value according to the motor.
If it undergoes overload the blade system will become deformed by turning off the circuit. In this case the protection will happen through a magnetic device, turning it off almost immediately.