Product Description: Fire shutter doors, and other single-phase small power motors Emergency power supply: The Series emergency power supply specifically for the fire shutter doors, smoke curtain doors, small pumps, a small power motor load design, full consideration of such load starting current large and continuous working time is short features for 11KW and below, single, three phase motors, can be 5 times the rated current of anti-start impact, ensure the motor's normal start, with its reasonable price.