TIME SWITCH FOR NIGHT POWER SUPPLY

PURPOSE:To enable the ensuring of a specified energization time with respect to a load, by supplementing a power failure time to make an actual energization time for the load equal to a set energization time while a power failure supplement time is displayed. CONSTITUTION:When occurring during the energization, a power failure is detected 21 and a power failure detection signal is inputted into a computing means 22, which 22 counts 25 the time of the power failure. Then, the means 22 discriminates the restoration of power by the stoppage of inputting the power failure signal to end the counting of the power failure time and the power failure time thus counted 25 is stored 35. Then, upon the end of the energization time, the power failure time stored 36 is read to be set on an internal register of the means 22 as power failure time. Moreover, the means 22 displays 31 the current time and the power failure supplement time alternately while the power failure supplement time is subjected to a subtraction processing as time passes to continue the ON state of an output relay 38 until the power failure time is down to zero. When the end of the power failure supplement time is discriminated, the current time alone is displayed 31 and the relay 38 is turned off thereby ensuring a power supply to a load.