The utility model provides a quick -break is from opening device for it starts the consumer through UPS to have no progeny at municipality's lighting, includes from opening relay, quick -break relay, transformer, bridge type rectifier circuit, electric capacity and can starting the starter of consumer. UPS's first live wire links to each other with transformer primary coil's one end, and transformer primary coil's the other end links to each other with the 2nd normally closed contact of quick -break relay, the 2nd change -over contact of quick -break relay links to each other with UPS's first zero line. The second coil of quick -break relay is by mains power supply. Transformer secondary coil is connected with bridge type rectifier circuit's input, bridge type rectifier circuit's output and capacitance parallel connection. From first coil and the capacitance parallel connection who opens the relay, second zero line with the commercial power behind the normally open contact polyphone starter that opens the relay links to each other, change -over contact from opening the relay is continuous with the second live wire of commercial power. Quick -break is from opening device has avoided because short -time power off causes the cooler air -conditioner system to stop the operation, prevents therefore causes UPS room temperature degree to rise, makes the stable work of the indoor important equipment of UPS, can not burn out because of high temperature.