Overview
The XL-21 low-voltage power distribution cabinet is suitable for use in power plants, industrial and mining enterprises, for power distribution in three-phase four-wire systems with AC voltage of 500 V and below.
The XL-21 low-voltage power distribution cabinet is an indoor wall-mounted installation with front-panel maintenance access.
Structural Features
The XL-21 low-voltage power distribution cabinet is of enclosed type, with the shell made of welded steel plates. The knife switch operating handle is mounted on the upper part of the front right column and can be used for switching the power supply. A voltmeter is mounted on the front of the distribution cabinet to indicate the busbar voltage. The front of the distribution cabinet has a door; when opened, all equipment inside the cabinet is exposed for easy inspection and maintenance. This distribution cabinet adopts domestically designed modular components, featuring compact structure, convenient maintenance, and flexible combination of circuit schemes. In addition to air circuit breakers and fuses for short-circuit protection, the distribution cabinet is also equipped with contactors and thermal relays. Operating buttons and indicator lights can be mounted on the front door.
Fuse-Switch Combination
| Model | Rated Current (A) | Fuse Link Rated Current (A) | Remarks |
| HR3-400/34 | 400 | 150, 200, 250, 300, 350, 400 | No fuse link when isolating blade is installed |
Air Circuit Breaker
| Model | Rated Current (A) | Tripping Device Setting Current (A) | Remarks |
| MLM5-40/390 | 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) | Primary Current (A) | Remarks |
| LM-0.5 | 75, 100, 150, 200, 300, 600 | 5 |
Fuse
| Model | Fuse | Fuse Link Rated Current (A) | Remarks |
| 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 |
AC Contactor
| Model | Rated Current (A) | Attraction Coil Voltage (V) | Remarks |
| MLC3-10 | 10 | AC 110 220 380 |
|
| MLC3-20 | 20 | ||
| MLC3-40 | 40 | ||
| MLC3-80 | 80 | ||
| MLC3-150 | 150 |
