Circuit interrupter with improved electro-mechanical undervoltage release mechanism

摘要

A multiple pole circuit breaker comprises stationary and movable contacts in each pole, with a cross bar extending between the poles and causing concerted movement of the movable contacts. An operating mechanism effects movement of the movable contacts between open and closed positions, and a resettable undervoltage release mechanism cooperates with the operating mechanism to effect movement of the movable contacts. The undervoltage release mechanism operates to move the movable contacts from the closed to open position upon the occurrence of voltage levels less than a predetermined value, with the undervoltage release mechanism being reset by physical contact with the cross bar as the cross bar moves with the movable contacts from the closed to open positions.