Magnetic blow-out circuit breaker with booster loop/arc runner

摘要

Rapid extinguishing of the arc in a circuit breaker is accelerated by a booster loop which extends parallel to an arc runner, but carries current in a direction opposite to the direction of current flow in the arc runner. The booster loop and arc runner are formed from a single piece of rigid conductor material, preferable stamped to form mounting lugs and bent over into a U-shaped configuration. In a preferred embodiment, the breaker internal connections are arranged such that current flows through a thermal overload sensor when the contacts are closed, but transfers to the booster loop and arc runner after arc current termination transfers from one of the contacts to the arc runner, thus reducing short circuit current duration through the thermal sensor.