Electromagnetic relay

Abstract

An electromagnetic relay, comprising: a case consisting of a terminal base and a cover fitted thereon; a pair of contact units arranged laterally on the terminal base; an electromagnet unit arranged in the case on a longitudinal end of the contact units; an upper longitudinal insulating wall depending from an upper inner wall surface of the cover between different ones of the contact units; a lower longitudinal insulating wall projecting from an inner surface of the terminal base so as to correspond to the upper longitudinal insulating wall; and an actuating member made of electrically insulating material for transmitting a drive force of an armature of the electromagnet unit to the contact units; a guide structure being defined between a lower end of the upper longitudinal insulating wall and an upper end of the lower longitudinal insulating wall so as to guide movement of the card along a longitudinal direction as it is actuated by an armature of the electromagnet unit to actuate the contact units between two different states of contact. Preferably, the guide structure comprises a longitudinal slot provided in the actuating member to receive a free end of one of the longitudinal insulating walls. Thus, a large stroke of the actuating member is made possible for improved reliability of the contact unit operation without reducing the insulating performance of the longitudinal insulating walls.