positive side of capacitor 108 whereas the negative voltage output terminal 107d of the bridge is interconnected with the negative side of the capacitor 108 in normal operation there is applied a 120 vac line voltage across terminals 2 and 3 of the terminal block tb 101 the relay k1 will be energized and the arm c of the relay k1 will be in contact with the normally opened contact no thus the 120 vac line voltage on tb 101 3 will be able to pass through to the normally opened relay contact no to the 34 hot 34 side 104a of the electrically operated gas solenoid valve 104 connected to tb 102 3 consequently the valve 104 connected generally at the inlet of the main gas line will be opened thereby allowing gas to flow downstream of the line to gas operated equipment such as gas stoves ovens and the like utilized in manufacturing facilities industrial plants food preparation facilities restaurants and the like these gas operated devices are conventionally provided with gas consuming elements which control the operation thereof when there is a power failure momentary fluctuation or surge the capacitor 108 which has been previously fully charged will begin to discharge through the coil of the relay k1 however the relay will remain energized and connection between the arm c and the normally opened contact no will be maintained until the capacitor is completely discharged consequently if sufficient power is again restored before the capacitor 108 has completely discharged the solenoid valve.