GB1531155A - Switching device - Google Patents

Abstract

1531155 Combined circuit-breaker and contactor I T E IMPERIAL CORP 21 May 1976 [22 July 1975] 21257/76 Heading H1N A motor starter has a common insulating housing 14 for a circuit-breaker and an electromagnetic contactor and pole-units common to both the contactor and circuit-breaker, the pole-units each comprising a series set of circuitbreaker and contactor contacts. As shown three pole-units separated by barriers 22, 23 in the housing 14 each have circuit-breaker contacts 30, 31 and contactor contacts 33, 34 forming part of a current loop which provides for opening of contacts 30, 31 by a blow-out" action render heavy fault conditions before a series trip coil 40 attracts an armature 47 which acts via a link 51 and adjustable screw 53 or a common trip bar 55 which releases the tension spring biased toggle operating mechanism (Fig. 3) in a compartment under a cover 18 through which an operating lever 82 extends. Each armature 47 has a biasing spring 56 coupled to an arm 58 on a common adjustable bar 59 housing an operating lever 61. Each contactor movable contact assembly 34, 35, 36 is mounted on a respective member 90 by being spring biased about a pin 89 thereon and the members 90 are mounted on a common shaft 91 rotatable on energization of an electromagnet (Fig. 4, not shown) under a cover 17 on the housing 14. Since part of the contact assembly is longer than part 35 thereof heavy current electro-dynamic forces tend to urge contacts 34 against contact 33. Overload relays 11, 12, 13 may be mounted on the load side of the starter.