xl(f)-21 power distribution cabinet is applicable for ac power systems up to and including 500v of three-phase three-wire, three-phase four-wire and three-phase five-wire system, used for power lighting and distribution.
xl(f)-21 power distribution cabinet is an indoor device, shall be installed against the wall and maintained on the panel.
● ambient temperature: -5℃～ 40℃, average temperature in 24h should not exceed 36℃.
● altitude should not exceed 2000m.
● relative humidity: air relative humidity should not exceed 50% at 40℃, higher relative humidity is permissible at lower temperature condition (for instance, 90% at 20℃). temperature change may product some dew.
● installation obliquity to vertical plane should not exceed 5°. the installation site should be free of strenuous vibration or impact, no corrosion affecting the electric components.
xl (f) -21 low-voltage power distribution cabinet is a distribution unit installed against the inner wall with single front door. its basic structure uses steel plate and angle iron welded together. front right side of it can install knife switch operating handle which is used for turning on and off the power, the door can be equipped with operating buttons, indicating lights and display instruments; after open the cabinet, all the inner devices are exposed which is easy for repair and maintenance; the distribution box is equipped with air circuit breakers and fuse as short-circuit protection, it is also equipped with contactor and thermal relay. the door and the shell are welded with ground screws to make sure reliable grounding connection.
rated voltage of main circuit
rated voltage of auxiliary circuit
rated insulation voltage