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What is the function of the red button on a QBL, QDL, QGL, or QJL circuit breaker?

What is the use of the red button on a QBL, QDL, QGL,  or QJL circuit breaker?
Product Line:
Circuit Breaker

Powerpact Q-Frame
The red button is an integral push-to-trip button use to manually trip the circuit breaker. This should be used as part of a regular preventive maintenance program.
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