XL-21 Power Distribution Cabinet
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Henan GNEE Electric Co., Ltd. is one of the most reliable manufacturers and suppliers of xl-21 power distribution cabinet in China. If you're going to buy customized xl-21 power distribution cabinet made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.
The XL-21 power distribution cabinet is a floor-type low voltage switchgear designed for three-phase AC systems up to 500V. It is widely used in power plants, industrial and mining enterprises, and high-rise buildings for power and lighting distribution in three-wire, four-wire, and five-wire configurations.
The cabinet shell is constructed from cold-rolled steel plate through bending and partial welding processes, ensuring rigidity and load-bearing capacity for mounting electrical components. It features a modular internal layout with configurable circuit breakers, fuses, contactors, and thermal relays to meet specific project requirements.
The XL-21 distribution cabinet is designed for indoor wall-mounted installation with front-panel operation, inspection, and maintenance access. A knife switch operation handle is mounted on the upper right front column for power isolation.
Need a custom XL-21 configuration for your project?
Model Designation: XL-21 Power Distribution Cabinet
Specify the exact model string for your order or tender document
The model designation helps identify the cabinet type, function, and configuration:
Note: Confirm the required scheme number in the final position after approving the power distribution configuration. Contact our engineering team for scheme selection assistance.
Key Features of XL-21 Low Voltage Distribution Cabinet
Engineered for reliability, safety, and easy maintenance in demanding industrial environments
Robust Steel Construction
Cabinet made from high-quality cold-rolled steel plate with powder-coated finish, ensuring high resistance to corrosion and mechanical damage in harsh industrial environments.
Modular Internal Layout
Modular design facilitates easy assembly, maintenance, and scalability. Multiple connection schemes available to meet varying power distribution needs and project specifications.
Front-Panel Maintenance
Designed for indoor wall-mounted installation with front-panel operation, inspection, and repair access. Doors can open 180 degrees for maximum accessibility.
Comprehensive Protection
Equipped with air circuit breakers, fuses, contactors, and thermal relays as short-circuit and overload protection. Door and shell are welded with ground screws for electrical safety.
Configurable Box Size
The cabinet box size can be customized to suit project demands. The separately removable mounting plate allows flexible component arrangement for different scheme numbers.
Compact & Space-Efficient
Space-efficient design allows easy integration into different environments while providing ample room for wiring and components. Standardized design combines compact structure with strong versatility.
mounting dimension and installation
Technical Specifications of XL-21 Distribution Cabinet
Complete electrical and mechanical parameters for tender documents and project specifications
| No. | Parameter | Unit | Value |
|---|---|---|---|
| 1 | Rated operating voltage (main circuit) | V | AC 380 |
| 2 | Rated operating voltage (auxiliary circuit) | V | AC 220 / AC 380 |
| 3 | Rated insulation voltage | V | 660 |
| 4 | Rated frequency | Hz | 50 / 60 |
| 5 | Rated current | A | ≤ 630 |
| 6 | Main bus rated current | A | 400 |
| 7 | Short-time withstand current | kA | 10 |
| 8 | Peak withstand current | kA | 17 |
| 9 | Rated impulse withstand voltage | kV | 8 |
| 10 | Power frequency withstand voltage (1 min, auxiliary control loop) | kV | 1.89 |
| 11 | Protection degree | - | IP30 |
| 12 | Electrical clearance | mm | ≥ 10 |
| 13 | Creepage distance | mm | ≥ 12.5 |
| 14 | Applicable system | - | 3-phase 3-wire / 4-wire / 5-wire AC ≤ 500V |
| 15 | Compliance standard | - | IEC 61439-1 / IEC 60439-1 |
| 16 | Installation type | - | Indoor wall-mounted, floor-standing |
Main Circuit Plan
Components and Configuration of XL-21 Cabinet
Main equipment installed inside the XL-21 power distribution cabinet
Combination Switch of Knife & Fuse
| Model | Rated Current | Melt Rated Current |
|---|---|---|
| HR3-400/34 | 400A | 150A, 200A, 250A, 300A, 350A, 400A |
Air Circuit Breaker
| Model | Rated Current | Tripping Current Range |
|---|---|---|
| MLM5-40/390 | 20A | 7A, 10A, 15A, 20A, 30A, 40A |
| MLM1-100/300 | 100A | 15A - 100A |
| MLM1-250/300 | 250A | 100A - 250A |
Current Transformer
| Model | Primary Current | Secondary Current |
|---|---|---|
| LM-0.5 | 75A - 600A | 5A |
Fuse
| Model | Fuse Rating | Rated Current of Fuse Link |
|---|---|---|
| RL1-15 | 15 | 2A, 4A, 5A, 6A, 10A, 15A |
| RL1-60 | 60 | 20A - 60A |
| RL1-100 | 100 | 30A - 100A |
| RL1-200 | 200 | 80A - 200A |
| RL1-400 | 400 | 150A - 400A |
Installation & Operating Conditions for XL-21 Power Cabinet
Confirm site conditions before specifying. All parameters must be within limits.
Ambient Temperature
Operating range: -25°C to +40°C. 24-hour average not exceeding +35°C.
Altitude
Installation altitude must not exceed 2,000 meters above sea level. Earthquake intensity not exceeding 8 degrees.
Relative Humidity
Average daily relative humidity ≤ 90% at +25°C. Average monthly ≤ 90%.
Installation Location
Indoor wall-mounted. Avoid fire/explosion hazards, serious pollution, chemical corrosion, and violent vibration.
Not sure if your site meets these conditions? Our engineers can help evaluate.
Applications of XL-21 Power Distribution Cabinet
Trusted across industries for reliable low voltage power distribution
Power Plants
Used for auxiliary power and lighting distribution in power generation facilities, supporting three-phase four-wire and five-wire AC systems up to 500V.
Industrial & Mining Enterprises
Provides reliable power distribution for factories, workshops, and mining operations. Robust steel construction withstands demanding industrial environments.
High-Rise Buildings
Installed in commercial and residential high-rise buildings for power and lighting distribution, with compact design fitting into electrical rooms.
Manufacturing Facilities
Supports motor control centers and power distribution for production lines. Configurable with circuit breakers and contactors for machine protection.
Infrastructure Projects
Used in transportation hubs, water treatment plants, and utility infrastructure for reliable low voltage power distribution and control.
Commercial Complexes
Power distribution for shopping malls, office buildings, and hotels. Front-panel maintenance access ideal for space-constrained electrical rooms.
Why Choose Our XL-21 Power Distribution Cabinet
Direct Factory Pricing:As a manufacturer, we eliminate middleman markups. Get competitive factory-direct quotes for your XL-21 cabinet projects.
Custom Configurations:We offer all scheme numbers and can customize component selections, cabinet dimensions, and busbar ratings to match your tender specifications.
Full Compliance Documentation:Each XL-21 cabinet ships with complete test reports, type test certificates, wiring diagrams, and IEC 61439 compliance documentation.
Engineering Support:Our technical team assists with scheme selection, component matching, and installation guidance throughout your project lifecycle.
FAQ
The XL-21 power distribution cabinet has a rated operating voltage of AC 380V (main circuit) and AC 220V/380V (auxiliary circuit). The rated insulation voltage is 660V. It is designed for three-phase AC systems up to 500V, including three-wire, four-wire, and five-wire configurations.
What is the maximum rated current of the XL-21 distribution cabinet?
The XL-21 power distribution cabinet supports a rated current of up to 630A. The main bus rated current is typically 400A, with a short-time withstand current of 10kA and a peak withstand current of 17kA. Different circuit breaker types and current grades can be selected to meet specific user requirements.
What protection degree does the XL-21 cabinet have?
The XL-21 power distribution cabinet has an IP30 protection degree, making it suitable for indoor environments without excessive dust and moisture. It is designed for indoor wall-mounted installation, avoiding direct exposure to sunlight, rain, and corrosive gases.
What standards does the XL-21 power distribution cabinet comply with?
The XL-21 power distribution cabinet complies with IEC 61439-1 (low voltage switchgear and control assemblies - General rules) and IEC 60439-1 standards. It also meets GB 7251.1 national standards. Full compliance documentation and test reports are provided with each unit.
The XL-21 cabinet includes combination knife-fuse switches (HR3-400/34, 400A), air circuit breakers (MLM5-40, MLM1-100, MLM1-250 series), current transformers (LM-0.5, 75A-600A primary, 5A secondary), fuses (RL1 series from 15A to 400A), contactors, and thermal relays. The cabinet shell is made of cold-rolled steel plate with ground screws on the door and shell for electrical safety.
What are the operating conditions for the XL-21 cabinet?
The XL-21 operates in ambient temperatures from -25°C to +40°C (24-hour average not exceeding +35°C), at altitudes up to 2,000 meters, and relative humidity up to 90% at +25°C. It must be installed indoors, away from fire or explosion hazards, serious pollution, chemical corrosion, or violent vibration. Earthquake intensity must not exceed 8 degrees.
Get Your XL-21 Power Distribution Cabinet Quote Today
Send us your project specifications and receive a custom quote within 24 hours. Free engineering consultation included.
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