XL-21 Low-voltage power distribution cabinet

Overview

The Xl-21 low-voltage power distribution cabinet is suitable for use in power plants and industrial and mining enterprises for power distribution inthree-phase four-wire systems with an AC voltage of 500 volts or less.

The XL-21 low-voltage power distribution box is an indoor device that is installed against a wal and maintained from the front of the screen.

Model Meaning

Structural Features

The XL-21 low-voltage power distribution cabinet is a closed-type design, with the outer shel made of stel plates. The knife switch operatinghandle is mounted on the upper part of the front right column and can be used for switching power sources.A volmeter is instaled on the front olthe distribution box to indicate the busbar voltage. The distribution box has a door on the front; when the door is opened, all interal equipmentis exposed, faciiltating maintenance and repair. This distribution cabinet uses domesticaly designed components, featuring a compact structureconvenient maintenance, and fexible combination of circuit confiqurations., in addition to air circuit breakers and fuses for short-circuit protectionthe cabinet is also equipped with contactors and thermal relays. The front door can be fitted with operation butons and indicator lights.

Main Equipment Technical Data

Knife-blade combination switch

Model	Rated current(A)	Fuse rated current(A)	Note
HR3-400/34	400	150、200、250、300、350、400	No melt when installing isolation blades

Air circuit breaker

Model	Rated current(A)	Tripping device setting current(A)
MLM5-40/300	20	7、10、15、20、30、40
MLM1-100/300	100	15、20、25、30、40、50、60、80、100
MLM1-250/300	250	100、120、140、170、200、225、250

Current transformer

Model	Primary current(A)	Initial current(A)	Note
LM-0.5	75、100、150、200、300、600	5

Current transformer

Model	Fuse	Fuse rated current(A)	Note
RL1-15	15	2、4、5、6、10、15
RL1-60	60	20、25、30、35、40、50、60
RL1-100	100	30、40、50、60、80、100
RL1-200	200	80、100、120、150、200
RL1-400	400	150、200、250、300、350、400