GB641255A - Improvements in or relating to electric switch gear - Google Patents

Abstract

641,255. Switchgear structures; electromagnetic switches; controllers. EGA ELECTRIC, Ltd., and KILMINSTER, G. Aug. 2, 1947, No. 21138. [Classes 38(iii) and 38(v)] An electromagnetic contactor 56 for controlling a motor or other device is mounted on a support 47 on the lid of a casing together with isolating contacts 48, 49, fuses, an overloading device, and '' stop" and " start" push button switches, the support being movable relative to the lid and the lid and support being readily removable so as to be replaced by a similar unit while repair is being effected. A three-phase arrangement is described and current after entering by three contacts 44 passes to contacts 48, through the fuses and overload device to the three pairs of contactor contacts 57, 58 and thence through contacts 49 and 54 to the motor. The support 47 is movable by means of a handle 72 along tubes 46 fixed to the lid so that when the lid is in position and the tubes pass over rods 40 fixed to the casing 35, operation of the handle 72 brings the isolating contacts into engagement. Rotation of the handle then brings a pin 76 out of alignment with a slot in the lid to hold the contacts in engagement. The rods 40 project through the lid and receive nuts to hold the lid in place. As shown, some of the contacts are laminated and the arrangement is such that engagement with the co-operating contact causes the laminations to splay out thereby cooling the contact. A single coil 63 operates the three contactors 61. Specification 641,269 is referred to.