MCB’s or Mini Circuit Breakers

These are automatic protection devices in a household consumer unit that switch off a circuit if they detect a fault. They are similar in size to fuses, but give more precise protection. When they ‘trip’ you can simply reset the switch, but make sure you correct the fault first.An MCB is a form of fuse (protective device) which overcomes the traditional problem associated with fuses in so much as when one blows it does not need to be replaced as a fuse does. MCB’s operate when they sense an overload, or over current, and become an automatic switch, turning off, or tripping, the MCB when it detects such an overload.