Miniature circuit breaker is a type of switchgear that can typically be used in the range of 0.5A to 100A. Its short-circuit rating is measured in kiloamperes (kA), indicating its level of operational capability. For example, household MCBs typically have a fault level of 6kA, while MCBs used in industrial applications may require units with a fault capability of 10kA.

The working principle of miniature circuit breaker (MCB): MCB is a protective device used to disconnect the circuit in case of overload or short circuit. In case of overload and short circuit faults, the working principle of miniature circuit breaker is:

For overload protection, they have bimetallic strips that can cause circuit disconnection. For short-circuit protection, it has electromagnetic effects.

Miniature circuit breakers have two working modes. Due to the thermal effect of overcurrent and the electromagnetic effect of overcurrent. The thermal operation of miniature circuit breakers is achieved through bimetallic strips. Whenever a continuous overcurrent flows through the MCB, the bimetallic strip is heated and deformed by bending. The deflection of the bimetallic strip releases the mechanical release device. Due to the connection between this mechanical release device and the operating mechanism, it will disconnect the contacts of the miniature circuit breaker. The electromagnetic effect is that when the load of the circuit breaker is short circuited, a large overload generates a sufficiently large electromagnetic field, which drives the armature and triggers the tripping mechanism. This part is connected to the operating mechanism and can also disconnect the contacts of the miniature circuit breaker. Both working modes can provide safety protection for the circuit

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