The Miniature Circuit Breaker-abbreviated as MCB-is the most widely utilized type of terminal protection device within the terminal power distribution systems of buildings. It is employed to provide protection against short circuits, overloads, overvoltages, and similar faults in single-phase and three-phase circuits rated at 125A or below; available configurations include single-pole (1P), double-pole (2P), triple-pole (3P), and four-pole (4P) variants.
Specifically, a Miniature Circuit Breaker is a mechanical switching device capable of making, carrying, and breaking currents under normal circuit conditions, as well as making, carrying for a specified duration, and breaking currents under specified abnormal circuit conditions.
