XL-21 series low-voltage power distribution cabinet is used for three-phase four-wire power system with AC 50Hz, rated voltage below 660V, below 1000KVA transformer as hotel, hospital, port, and factory and mining enterprise power distribution, power lighting, voltage 380V, capacity 0.52-75kv electric control device of motor and lighting. For other occasions in line with the power distribution box can also be used. The product has the characteristics of live line scheme, combination, strong application, novel structure, etc. The shell protection level can reach IP30, and the product meets the requirements of IEC60439.1-1999 "Low-voltage complete switchgear and control equipment" and GB7251.1-2005 "Low-voltage complete switchgear and control equipment" related standards.