Electromagnetic switching apparatus including improved means for mechanically latching a contact bridge carrier

Abstract From the Canadian patent

A remotely-controllable electromagnetic switching apparatus including a housing, a contact bridge carrier disposed within the housing and, means for mechanically latching the contact bridge carrier by locking the contact bridge carrier in an operative switching position by means of a first lever member which is movable into a return-movement region of the contact bridge carrier by means of a spring force and is pivotably coupled to a second lever member. The improvement comprises the lever members comprising toggle levers which are movable into an almost fully-extended beyond dead-, center position for blocking return movement of the contact bridge carrier into the return movement region. …