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MCB stands for Miniature Circuit Breaker. It's an automatic switch that protects electrical circuits from damage caused by overloads or short circuits. When excessive current flows, the MCB trips and interrupts the power supply, preventing potential damage to the circuit and connected devices. MCB, the abbreviation of Miniature Circuit Breaker, is a kind of automated electrical switch of an electrical circuit. The main function of MCB is during an unusual network condition or electrical situation; it gets off, to stop the current flow in this electrical system. MCB – Miniature Circuit Breaker. MCCB – Moulded Case Circuit Breaker. ELCB – Earth Leakage Circuit Breaker. RCCB – Residual Current Circuit Breaker.