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The MCB-Miniature Circuit Breaker. An MCB is a form of fuse (protective device) which overcomes the traditional problem associated with fuses in so much as when one blows it does not need to be replaced as a fuse does or in older fuses, the wire does not need replacing.CB's operate when they sense an overload, or over current, and become an automatic switch, turning off, or tripping, the MCB when it detects such an overload.
This page describes a simple circuit breaker. See the next page for the residual current circuit breaker. The circuit breaker acts as a safety device in the same way as a fuse. Circuit breakers that are used at the distribution board in houses are called MCBs (minature circuit breakers).The distribution board is also called the consumer unit.The MCBs disconnect the supply if too large a current flows. The picture below shows a simple circuit breaker.ircuit breakers that are used at the distribution board in houses are called MCBs (minature circuit breakers). The distribution board is also called the consumer unit. The MCBs disconnect the supply if too large a current flows.