XL-21 series low-voltage power distribution cabinet for AC 50Hz, rated voltage below 660V, 1000KVA transformer below the three-phase four-wire power system as hotels, hospitals, ports, and factories and mining enterprises distribution, power lighting, voltage 380V, capacity of 0.52-75kW motor electronic control device and lighting. It can also be used for other symbols of the power distribution box. The product has the characteristics of flexible circuit scheme, convenient combination, strong application, novel structure, etc. The shell protection grade can reach IP30.