The XL-21 distribution box is a low-voltage, modular power distribution cabinet designed for industrial, commercial, and residential applications, with rated voltages up to 660V and currents up to 800A.

General Overview

The XL-21 series is a versatile low-voltage power distribution box used for power distribution, conversion, transmission, and control in low-voltage systems. It is widely applied in power plants, substations, industrial enterprises, commercial buildings, and high-rise structures. The series supports three-phase three-wire, four-wire, and five-wire configurations and is suitable for both power and lighting distribution systems .

Electrical Ratings

• Rated Voltage: 400V or 660V AC, 50Hz
• Rated Current: 630A to 800A depending on model
• Protection Level: IP54 for dust and water splash protection
• Short-Circuit Testing: Passed internal short-circuit tests ensuring safety and reliability
• Compliance: IEC60439-1:1992, GB7251.1-2013, GB7251.12-2013, GB7251.3-2006

Construction and Materials

• Cabinet Frame: 8FM open-profile or C-profile steel sections
• Panel Surface: Cold-rolled steel with electrostatic spray or epoxy resin coating
• Door Design: Beveled doors with patented latches for pressure release and safety
• Hinges: Precision-cast adjustable hinges allowing doors to open beyond 135°
• Dimensions: Width 400–1000mm, Height 1600–2200mm, Depth 400–800mm
• Mounting: Floor-standing or wall-mounted, with top and bottom entry/exit options for cables

Features and Modularity

• Internal Components: Supports circuit breakers, contactors, relays, measurement instruments, and rotary load isolation switches
• Motor Control: Can control squirrel-cage and wound-type motors in low-voltage systems
• Auxiliary Circuits: Supports local/remote control with automatic switching between modes
• Modular Design: Allows flexible combinations and easy integration into larger systems
• Maintenance: Top and bottom doors for easy access; wiring channels designed for convenience

Environmental and Safety Considerations

• Operating Temperature: -5°C to +45°C
• Ingress Protection: Sealed joints and gaskets prevent dust and moisture ingress
• Applications: Suitable for factories, construction sites, marine installations, hospitals, data centers, and residential complexes
• Safety Features: Overload, short-circuit, under-voltage, phase-failure, and optional earth leakage protection

Summary

The XL-21 distribution box is a robust, standardized, and modular solution for low-voltage power distribution. Its combination of high-quality materials, safety features, modularity, and compliance with international standards makes it suitable for a wide range of industrial, commercial, and residential applications. When selecting an XL-21 box, it is important to verify the IP rating, NEMA classification, and current/voltage requirements to ensure compatibility with the intended environment .