Switching equipment having electromagnetic trip device e.g. for line safety or motor-circuit switches, has housing, contact point which has fixed and mobile contact part and electromagnetic trip device

摘要

The switching equipment (1) has a housing (2), a contact point (4) which has a fixed and a mobile contact part (8, 6) and an electromagnetic trip device (20, 20a, 20b), having a trip coil (22, 22a, 22b) and a hammer armature (26, 26a, 26b). The electromagnetic trip device has a snap body consisting of a material with magnetic shape memory properties, which interacts with the hammer armature. When a short-circuit occurs, the snap body is switched between two bi-stable positions by the influence of the magnetic field of the trip coil.