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MINIATURE CIRCUIT BREAKER PARTS


Actuator lever - used to manually trip and reset the circuit breaker. Also indicates the status of the circuit breaker (On or Off/tripped).

Actuator mechanism - forces the contacts together or apart.

Contacts - Allow current when touching and break the current when moved apart.

Lower and Upper Terminals.

Bimetallic strip - separates contacts in response to smaller, longer-term overcurrent.

Solenoid - separates contacts rapidly in response to high overcurrent

Calibration Screw – adjust thermal tripping rating after assembly

Arc divider/extinguisher – Interrupting the arc to avoid contacts damage

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