OFA Electrical
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A Miniature Circuit Breaker (MCB) is an automatically operated electrical switch designed to protect low-voltage electrical circuits from damage caused by overload or short circuits.
1P (Single Pole) switches and protects one phase line. 2P (Double Pole) switches both phase and neutral lines for enhanced safety. 3P (Three Pole) is designed for three-phase systems to switch all three phase conductors simultaneously.
Selection depends on the total load current, operating voltage, required breaking capacity, and ambient temperature. Always ensure the MCB rating matches the current-carrying capacity of the circuit wiring.
MCBs trip mainly due to circuit overload (connecting too many high-power devices) or short circuits (direct contact between live conductors or live-to-ground faults).
Yes, unlike traditional fuses, an MCB can easily be reset manually once the underlying electrical fault or overload condition has been identified and corrected.
High-quality MCBs are engineered for durability, offering up to 20,000 mechanical operations and 10,000 electrical operations under standard service conditions.
