CONTACT MECHANISM FOR ELECTRONIC OVERLOAD RELAYS

摘要

Ease of assembly, inexpensive construction and improved reliability may be achieved in a trip mechanism for an overload relay including a housing containing a bistable armature mounted in the housing on a pivot for pivotal movement between two stable positions. Fixed contacts are located within the housing and moveable contacts are carried by leaf springs for movement to a closed position with the fixed contacts for one of the two stable positions and for movement to an open position relative to the fixed contacts for the other of the two stable positions. Projections carried by the armature are operative to move the leaf springs and their associated contacts. A latch arm is carried by the armature and has a latch surface. A spring is mounted on the housing and has a latch finger for engaging the latch surface and retaining the armature in one of the two positions.