The structure of the miniature circuit breaker is as follows: if shown, each important component is indicated in the diagram:

1. Line/load power terminal.

2. Bimetallic sheet. Bending due to heat (current) results in a small response, and prolonged overcurrent causes the contacts to separate, resulting in the circuit breaker tripping.

3. Contact mechanism. Current flows when closed; Current flows during separation.

4. Arc chamber. Guide the plasma arc to the arc distributor.

5. Arc extinguishing structure. Divide the main arc into smaller arcs and extinguish them.

6. Coil/Solenoid. Separate contacts in response to overcurrent (such as S short circuit).

7. Actuator rod. Manually trip 0 r and reset the circuit breaker.

8. Execution agency. Forced contact or separation.

However, under short-circuit conditions, a sudden increase in current can cause electromechanical displacement of the plunger associated with the trip coil or solenoid of the MCB. The plunger impacts the trip lever, causing the latch mechanism to immediately release, thereby disconnecting the circuit breaker contacts. This is a simple explanation of the working principle of miniature circuit breakers. The tripping mechanism of miniature circuit breakers, as described in the previous article, has two types of tripping mechanisms for MCBs.

Overload thermal trip

Short circuit electromagnetic trip

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