A Miniature Circuit Breaker (MCB) is a safety device designed to automatically switch off an electrical circuit during abnormal conditions such as an overload or a short circuit. Unlike the old-fashioned fuse, which requires replacement after a single use, an MCB can be reset manually or automatically once the fault condition has been resolved. They operate on a simple yet effective principle, utilizing both a bimetallic strip (for overload protection, which heats up and bends to trip the mechanism) and an electromagnet (for immediate response to high short-circuit currents). MCBs are crucial for preventing electrical fires and protecting appliances, available in various configurations—such as B, C, or D tripping curves—to suit different applications ranging from residential lighting circuits to industrial motors.
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