It is suitable for metallurgy, petroleum, chemical industry, industrial and mining enterprises and infrastructure fields, as a three-phase AC frequency of 50 (60) Hz, working rated voltage 380V (400) V, (690V), rated current below 6300A in the power distribution, control. It is suitable for metallurgy, petroleum, chemical industry, industrial and mining enterprises and infrastructure fields, as a three-phase AC frequency of 50 (60) Hz, working rated voltage 380V (400) V, (690V), rated current below 6300A in the power distribution, control. XL-21 power box is widely used in power plants and industrial and mining enterprises. It is used for power or lighting distribution in three-phase three-wire, three-phase four-wire, three-phase five-wire and other distribution systems with three-phase AC below 500V. These cabinets house the equipment and wiring that control the flow of electricity. The mining and petrochemical industries have complex operating environments and extremely high requirements for production continuity. In the mining industry, reliable power supply is required for underground mining, ore transportation, and other processes. 5 armored removable AC metal enclosed switchboard is three-phase AC 50Hz and rated voltage 40. PRODUCT OVERVIEW Model KYN28-12 AC metal.