1. IN AN ELECTRICAL SNAP-ACTION SWITCH HAVING A CONTACT ARM MOVABLE BETWEEN SWITCH-ON AND SWITCH-OFF POSITIONS, A SHIFT LEVER OPERATIVELY CONNECTED TO THE CONTACT ARM AND MOVABLE ACROSS A CENTER POSITION FOR OVER-THE-CENTER ACTUATION OF THE CONTACT ARM, A MOVING MEMBER CONTACTING THE SHIFT LEVER FOR POSITIVE ACTION TO THE SWITCH-ON POSITION AND MOVABLE BETWEEN SWITCH-ON AND SWITCH-OFF POSITIONS THROUGH A POINT CORRESPONDING TO THE CENTER POSITION OF THE SHIFT LEVER, AND MEANS URGING THE SHIFT LEVER TOWARDS THE SWITCH-OFF POSITION, THE IMPROVEMENT COMPRISING: A RELEASABLE LATCH ENGAGING THE SHIFT LEVER IN THE SWITCH-ON POSITION; AND ACTUATING MEANS CONNECTED TO THE MOVING MEMBER TO RELEASE THE LATCH AFTER THE MOVING MEMBER HAS MOVED FROM THE SWITCH-ON POSITION TO BEYOND SAID POINT.