GB550026A - Improvements in and relating to electric circuit breakers - Google Patents

Abstract

550,026. Electromagnetic switches; arcrupturing. BRITISH THOMSON-HOUSTON CO., Ltd. July 17, 1941, No. 9052. Convention date, July 17, 1940. [Class 38 (v)] The fixed contact 20 of an electromagnetic contactor or other switch is fixed, as by a screw 22, to a supporting member 21 of copper or like metal which is secured, as by screws 25, to an insulating base 14 and bent round so as to enclose a blow-out coil 27 the ends of which are secured respectively to the member 21 and a terminal 28 also secured to the base ; the polepieces 31, 32 of the blow-out magnet are welded to its core 30 and rest tightly against the edges of the member 21. The movable contact 33 is spring-mounted on a member 37 rotatable about an axis 42 and can itself pivot relatively to the member 37 about a projection 40. Its end 44 also possesses appreciable mass. An arc-chute member 67 with side barrier walls co-operates with the base and with barriers 72 on the member 37 to enclose the contacts &c. The arc is adapted to be driven from the contacts on to the support 21 and an arcing contact 76b and out through holes in the chute 37 which, when there are several pairs of contacts as in a three-phase circuit, may be staggered, Fig. 9 (not shown).