Sat November 26, 2011 By: Punam Thakur

how MCB works

Expert Reply
Sun November 27, 2011
MCB stands for Miniature Circuit Breaker. They are safety switches used for protection of appliances and human beings. If the current through a circuit exceeds the safety limits rated by the MCB, it automatically turns off and protects the devices connected to the circuit. This automatic turn off is accomplished by over current sensor and temperature sensor circuitry along with a relay mechanism. MCBs are the replacement for safety fuses which were used in earlier.
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