ON VIDEO MCB changeover switch wiring for single phase

MCB changeover switch wiring for single phase

A circuit breaker is an automatically controlled electrical switch designed to allow electrical current to flow and to protect an electrical circuit from damage caused by excessive current from an overload, short circuit, or ground leakage. earth (residual current circuit breaker).

 It is capable of interrupting an overload current or a short-circuit current in an installation. Depending on its design, it can monitor one or more parameters of a power line.
Its main characteristic compared to the fuse is that it is manually resettable (it is designed not to suffer any damage during its operation).

This type of circuit breaker trips when an excessive current passes through a bimetallic strip, creating heating by the Joule effect and causing it to deform. This bimetallic strip mechanically triggers a contact, which opens the protected electrical circuit. This electromechanical system is quite simple and robust but is not very precise and its reaction time is relatively slow. It therefore makes it possible to avoid placing the circuit in prolonged overcurrent. The main function of the thermal protection is to protect the conductors against excessive temperature rises which can generate fire risks, due to prolonged overloads of the electrical installation.

It performs the same function as a fuse, which must be replaced after switching off the power.

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