A miniature circuit breaker (MCB) is an Electrical Switch that automatically switches off the electrical circuit during an abnormal condition of the network means an overload condition as well as a faulty condition . Nowadays we use an MCB in a low voltage electrical network instead of a fuse. Specifications: Origin: CN(Origin) Certification: NONE Type: Mini Model Number: NXB-125 4P Package Includes: 1 x CHNT CHINT NXB-125 4P Miniature Circuit breaker MCB