Miniature Circuit Board (MCB) is a safety device with significant commercial and residential applications. It is an electro-mechanically driven automatic circuit protection device. It’s an automatic safety mechanism that prevents damage to electrical circuits due to excess current flow. It uses for low-voltage electrical networks like lighting and small electrical appliances.
It operates automatically, meaning if a short circuit or overcurrent occurs, the MCB will automatically trip, disrupting the power supply and preventing any damage. However, these are sensitive to minimal current variations and detect minute levels that exceed safety limits. MCB uses to interrupt a circuit during overload & short circuits.