... , JB/T9661-1999 Rated voltage: AC400V XL-21 low voltage power distribution box XL-21 power distribution box is suitable for the ... power plant, petroleum, chemical, metallurgical, textile and skyscraper. XL-21 power distribution box is as the power, power distribution, motor ... conversion, distribution and control. There is two types of XL-21 power distribution box. The height is 1700mm and 1800mm for ...