US Patent 7026906 Circuit breaker

A circuit breaker has a housing in which two conductive plates, a bimetallic strip and a swing plate with a U-shaped notch are retained, wherein a switch is mounted at the top of the housing. Each conductive plate has an end protruding from a bottom of the body. The bimetallic strip with a movable node connects to one of the conductive plates, where the movable node contacts an immovable node secured at the other conductive plate. The swing plate is attached to near the bimetallic strip near the movable node. A pivot block linked to the bottom of the switch is placed in the U-shaped notch. When current exceeds a predetermined level, the bimetallic strip deforms so that the movable node is separated from the immovable node. Since the pivot block has a lobe configuration, the pivot block can be moved in the notch smoothly and easily separated from the immovable node.