Series since the double over-voltage under-voltage protection device is the company based on the current status of development of a new generation of electricity appliance protection. Control circuit assembly of imported components used, the product with a modular standards, excellent performance and reliability. Able to work under abnormal voltage conditions. When the mains voltage exceeds the action voltage protector, the protector can be quickly and reliably cut off the circuit to achieve the protection of electrical and personal safety. When the mains voltage is restored, the protection can be automatically connected to the power, restore power, all the automatic implementation of all functions, no personnel to operate. Two-color LED on the front panel can indicate the protection status of work. Normal power supply light was green hair, red hair cut off power supply when the protection function is activated.