What part of a circuit breaker moves to interrupt the current flow?

The part of a circuit breaker that moves to interrupt the current flow is the contact. When an overload or short circuit occurs, the trip unit detects the abnormal current levels. This unit is responsible for initiating the interruption process by releasing the mechanism that holds the contacts together. Once released, these contacts separate, effectively breaking the circuit and stopping the flow of electricity.

This action is crucial for protecting the electrical system and preventing damage from overheating or electrical fires. The contact's ability to open and close determines the circuit breaker's operational effectiveness and responsiveness to electrical faults. Understanding this mechanism is key in rigging and hoisting practices, where electrical safety is a vital consideration.