XL-21 Power Distribution Cabinet
XL(F)-21 power distribution cabinet is suitable for power plants, industrial and mining enterprises, and commercial facilities with three-phase three-wire, three-phase four-wire, and three-phase five-wire systems at AC voltage up to 500V and rated frequency of 50Hz/60Hz, used for power and lighting distribution in industrial and commercial environments.
The XL-21 series is a floor-standing, front-access power distribution cabinet designed for indoor installation. It integrates incoming main switches, outgoing feeder circuit breakers, metering and monitoring devices, and control circuitry within a standardized metal-enclosed frame. The cabinet adopts a fixed-mounting configuration with all components permanently installed on mounting plates or DIN rails within the enclosure, providing a robust and cost-effective distribution solution for medium to large-scale low voltage power distribution applications.
Technical Specifications
| Item | Specification |
|---|---|
| Rated Voltage | AC 380V / 400V / 415V (500V max.) |
| Rated Frequency | 50Hz / 60Hz |
| Rated Current (Main Busbar) | 100A / 200A / 400A / 630A / 1000A (selectable by model) |
| Rated Short-time Withstand Current (Icw) | 10kA / 15kA / 25kA (1s) |
| Rated Peak Withstand Current (Ipk) | 25kA / 37.5kA / 52.5kA |
| System Configuration | Three-phase three-wire / Three-phase four-wire / Three-phase five-wire (TN-S, TN-C, TN-C-S, TT) |
| Number of Outgoing Circuits | 4–24 circuits (configurable) |
| Protection Functions | Short-circuit, overload, earth leakage (selectable per circuit) |
| Main Switch Type | Moulded case circuit breaker (MCCB) or isolating switch |
| Outgoing Device Type | MCCB / MCB / RCBO (selectable by specification) |
| Installation Type | Indoor, floor-standing |
| Degree of Protection | IP30 / IP40 (indoor) |
| Enclosure Material | Cold-rolled steel with epoxy powder coating |
| Enclosure Thickness | 1.5mm – 2.0mm (sheet metal) |
| Cable Entry | Bottom cable entry (standard) / Top entry (optional) |
| Door Type | Front single-door or double-door with lockable handle |
| Standards | GB/T 7251, IEC 61439 |
Key Features
- Versatile Low Voltage Distribution Platform: Designed for a wide range of power and lighting distribution applications in industrial plants, commercial buildings, and infrastructure facilities — supporting incoming currents from 100A to 1000A with configurable outgoing circuit arrangements from 4 to 24 individual feeder circuits
- Multiple System Compatibility: Fully compatible with three-phase three-wire, three-phase four-wire, and three-phase five-wire systems including TN-S, TN-C, TN-C-S, and TT earthing configurations — suitable for international low voltage distribution network standards
- Floor-Standing Robust Construction: Heavy-gauge cold-rolled steel enclosure (1.5–2.0mm thickness) with epoxy powder coating provides excellent mechanical protection for internal components — the floor-standing design accommodates larger component layouts and higher current ratings than wall-mounted alternatives
- Flexible Internal Configuration: Internal mounting plates, DIN rails, and cable management channels can be configured to accommodate a wide variety of component layouts — main incoming switches, busbar systems, outgoing MCCBs/MCBs, contactors, relays, timers, metering devices, and terminal blocks can all be arranged within a single cabinet to meet specific project requirements
- Easy Front Access and Maintenance: Full front access via lockable hinged doors provides convenient access to all components for routine inspection, maintenance, and circuit modifications without requiring rear or side clearance — reducing installation footprint and simplifying placement in space-constrained distribution rooms
- Comprehensive Circuit Protection: Each outgoing circuit is individually protected by MCCB or MCB with thermal-magnetic or electronic trip units providing short-circuit and overload protection — optional RCBO (residual current circuit breaker with overcurrent protection) provides integrated earth leakage protection for circuits serving wet areas or sensitive equipment
- Clear Circuit Identification: Each outgoing circuit is clearly numbered and labeled on the inside of the door with corresponding circuit identification charts, simplifying operation, fault-finding, and maintenance by facility electrical staff
- Cost-Effective Power Distribution: Simple fixed-mounting construction without draw-out mechanisms or complex interlocking systems provides a cost-effective distribution solution for standard power and lighting applications where the operational flexibility of withdrawable switchgear is not required
Applications
- Power plants — auxiliary power and lighting distribution
- Industrial and mining enterprises — machine power and workshop lighting
- Commercial buildings — main and sub-main distribution boards
- Infrastructure — water treatment plants, pumping stations, and ventilation systems
- Office buildings and shopping centers — power and lighting distribution
- Educational and healthcare facilities — general power distribution
- Light industrial and manufacturing facilities — equipment power supply