Abstract: A switch which is opened and closed by successively depressing a manual operating handle is provided with one spring for separating the switch contacts and a separate spring for closing the switch contacts. Interrupting capacity is improved without increasing overall size by utilizing a J-shaped movable contact arm mounted on a pivot located a substantial distance from the movable contact. The closing spring is located adjacent to the arcing or interrupter area. A metal shield is positioned to protect the closing spring from hot arcing gases as they exit from the interrupter area. The speed of instantaneous or magnetic tripping is improved by providing the magnet coil with at least one complete current carrying loop.