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

Mechanisms for operating contacts > 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

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