The XL-21 type low-voltage power distribution cabinet is suitable for use in power plants and industrial and mining enterprises for power distribution in three-phase four-wire systems with AC voltage up to 500V.
The XL-21 type low-voltage power distribution cabinet is an indoor unit designed for wall-mounted installation and front-side maintenance.
This distribution cabinet adopts domestically designed modular components, featuring compact structure, easy maintenance, and flexible combination of circuit schemes. In addition to being equipped with 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 installed on the front door of the cabinet.
Main Equipment Technical Data
| Switch-Disconnector Fuse Unit | |||
| Type | Rated Current (A) | Fuse Element Rated Current (A) | Remarks |
| HR3-400/34 | 400 | 150, 200, 250, 300, 350, 400 | No fuse element when isolating blade is installed |
| Air Circuit Breaker | |||
| Type | Rated Current (A) | Trip 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 | |||
| Type | Primary Current (A) | Secondary Current (A) | Remarks |
| LM-0.5 | 75, 100, 150, 200, 300, 600 | 5 | |
| Fuse | |||
| Type | Fuse Rated Current (A) | Fuse Element 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 Contactors | ||
| Type | Rated Current (A) | Coil Voltage (V) |
| MLC3-10 | 10 | 110 / 380 AC |
| MLC3-20 | 20 | 110 / 380 AC |
| MLC3-40 | 40 | 110 / 380 AC |
| MLC3-80 | 80 | 110 / 380 AC |
| MLC3-150 | 150 | 110 / 380 AC |
