1. A REMOTE CONTROL SWITCH COMPRISING A HOUSING OF INSULATING MATERIAL, A FIRST AND A SECOND CHAMBER IN SAID HOUSING, SAID FIRST CHAMBER HAVING A GREATER VOLUME THAN SAID SECOND CHAMBER, A QUANTITY OF GAS IN EACH OF SAID CHAMBERS, SAID GAS BEING FILLED AT A PRESSURE GREATER THAN ATMOSPHERIC PRESSURE, A SUBSTANTIALLY STRAIGHT, NARROW CAPILLARY BORE COMMUNICATING WITH SAID CHAMBERS, AN ELECTRIC HEATING DEVICE IN SAID FIRST CHAMBER, AT LEAST TWO ELECTRICAL CONTACTS EXTENDING INTO SAID BORE, A SWITCHING MERCURY COLUMN FOR THE CONTACTS IN SAID BORE NORMALLY POSITIONED IN SUSPENDED STATE AND SERVING AS A BRIDGE FOR THE CONTACTS, GAS PRESSURE OF THE SECOND CHAMBER SERVING AS A CUSHION FOR THE MERCURY AND SERVING RAPIDLY TO RETURN THE MERCURY TO ITS NORMAL POSITION AFTER THE HEATING DEVICE IS DE-ENERGIZED.