1. A CIRCUIT INTERRUPTER INCLUDING A CASING HAVING A BASE LYING IN A GIVEN PLANE AND UNPSTANDING WALLS DEFINING A PLURALITY OF POLE SPACES, A PAIR OF STATIONARY CONTACTS MOUNTED ON SAID BASE IN EACH OF SAID POLE SPACES, MOVABLE CONTACTS IN EACH OF SAID POLE SPACES, SAID MOVABLE CONTACTS BEING MOVABLE IN A DIRECTION PERPENDICULAR TO THE PLANE OF SAID BASE FROM A POSITION ENGAGING SAID STATIONARY CONTACTS TO A REMOTE POSITION, OPERATING MECHANISM FOR SAID INTERRUPTER MOUNTED ON SAID CASING, SAID OPERATING MECHANISM INCLUDING OVERCENTERING SPRING MEANS, SAID OVERCENTERING SPRING MEANS BEING OPERABLE IN A PLANE PARALLEL TO THE PLANE OF SAID BASE, AND MEANS INTERCONNECTING SAID MOVABLE CONTACTS AND SAID OPERATING MECHANISM FORT SNAP ACTING CONJOINT RECIPROCATING MOVEMENT OF SAID MOVABLE CONTACTS BETWEEN SAID ENGAGED AND REMOTE POSITIONS.