ELECTRICAL SWITCHING APPARATUS AND RELAY INCLUDING A FERROMAGNETIC OR MAGNETIC ARMATURE HAVING A TAPERED PORTION

摘要

An electrical switching apparatus (2;50;90;100) includes a ferromagnetic frame (8) having first (110) and opposite second (112) portions, a ferromagnetic core (33) disposed therebetween, a permanent magnet (12) disposed on the first portion, a first tapered portion (113) on the opposite second portion; a coil (4) disposed about the core; and a ferromagnetic or magnetic armature (10) including a first portion (114), an opposite second portion (116) and a pivot portion (118) pivotally disposed on the core between the portions of the armature. The armature opposite second portion has a complementary second tapered portion (38) therein. In a first armature position, the armature first portion is magnetically attracted by the permanent magnet and the first and second tapered portions are moved apart with the coil de-energized. In a second armature position, the armature opposite second portion is magnetically attracted by the opposite second portion of the frame and the first tapered portion is moved into the second tapered portion with the coil energized.