SELECTABLE AUXILIARY AND TRIP ALARM CONTACT FOR MODULAR PROTECTION DEVICES

摘要

The present disclosure relates to architecture of a selectable contact device for modular protection devices that besides being used as a selectable contact device can also be used as an auxiliary contact or trip alarm contact after minor modifications. The disclosure provides an architecture wherein moving contacts are configured between a pair of arms of a bridge such that the movement of the moving contacts is delayed due to a gap between the moving contact and the pair of arms. Therefore in the event of welding of contacts of the modular protection device, the selectable contact device reflects the true position of the contacts. Further the moving contacts toggle between two stable ON and OFF positions. Therefore the moving contacts achieve a speed that is independent of the speed of the bridge thus preventing the erosion of the contacts due to extended arcing on account of slow manual changeover speed of the modular protection device.