Circuit breakers (MCB) are electromechanical components in the electrical circuit, which are designed to protect from damages caused by overload, low voltage or short circuit. The two main components of the circuit breakers are thermal and electromagnetic switches. The first is used for protection of a current flow with greater than the nominal value for a longer period, and the electromagnetic switches - to prevent short circuits. Depending on the field of applications, circuit breakers are two types: for low and for high voltage. The values of the switches for low-voltage does not exceed 1000 volts. Depending on the number of poles ranging from 1 to 3, circuit breakers may be single phase, single phase with a zero interruption, three phase, etc.
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