wherein an auxiliary movement thereof, or of an attachment thereto, is necessary before the main movement is possible or effective, e.g. for unlatching, for coupling

Full Title

Mechanisms for operating contacts ( thermal actuating or release means H01H37/02) > Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch > wherein an auxiliary movement thereof, or of an attachment thereto, is necessary before the main movement is possible or effective, e.g. for unlatching, for coupling