Miniature Circuit Breaker or MCB: What is it? (Working Principle) | Electrical4U
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Manually switch the switch to the closed position to make the circuit breaker work. Overload protection:If the circuit is overloaded for a long time, the bi-metallic strip becomes overheated and deformed. This deformation of Bi-metallic strip causes, displacement of latch point. The moving contact of the MCB is arranged by means of spring pressure, with this latch point, that a little displacement of latch causes, release of spring and makes the moving contact to move for opening the MCB. | Lear
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