1. A micro-switch comprising a casing, a snap action switch lever in said casing, a connecting member rockingly mounted in said casing and engageable by said switch lever, a switch spring connected between said switch lever and said connecting member, an actuating member operable from the outside of said casing, a spring-loaded rocking member mounted in said casing and operable by said actuating member, a trigger on said rocking member, a second rocking member mounted in said casing and normally restrained against movement by said spring-loaded rocking member, said second rocking member carrying a follower operable by said connecting member, an escapement wheel pivoted in said casing, means operable by said second rocking member to drive said escapement wheel, an escapement armature rockingly mounted in said casing and cooperative with said escapement wheel, said armature comprising a tip engaged with and normally restrained by said trigger, movement of said spring-loaded rocking member through operation of said actuating member disengaging said second rocking member and freeing said armature tip from said trigger to enable operation of said esCapement wheel by movement of said second rocking member by said switch spring.