XL-21 Power Distribution Box (Cabinet)
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Product Description
Product Overview
The XL-21 Power Distribution Box (Cabinet) is designed for the secondary side of transformers in 50 Hz, 500 V and below three-phase three‑wire and three‑phase four‑wire power systems. It serves as over‑load and short‑circuit protection for power, lighting, distribution, and control circuits, and can be used in industrial and mining enterprises, civil buildings, high‑rise structures, railway stations, hospitals, schools, government offices, and residential buildings for power, lighting, and distribution purposes. This distribution box (cabinet) features high breaking capacity and excellent dynamic and thermal stability. It offers flexible design options, strong adaptability and practicality, a well‑developed series lineup, and high manufacturing precision.
Product Model and Meaning
Operating Environment
1. Ambient air temperature: -5°C to +40°C;
2. Altitude ≤ 2000 m;
3. Relative humidity of air: ≤95% (average for the wettest month);
4. Daily temperature range ≤ 25 K;
5. Seismic intensity ≤ 8 degrees;
Note: For conditions beyond the above-mentioned normal operating environment, please consult with the manufacturer.
Main Features
This product can be fabricated by bending and welding steel plates, resulting in smooth, seamless welds on the enclosure. Alternatively, C‑channel profiles can be used for modular, assembled cabinet construction. Both the welded and assembled structures offer sufficient strength and rigidity to withstand the dynamic and thermal stresses generated during component short circuits. The product features a single left-hand door equipped with measuring instruments and control/indicator devices. When the door is opened, all electrical components are fully exposed, facilitating easy inspection and maintenance. Cable entry/exit is achieved via cable conduits; however, if required by the user, knock-out holes for cable entry can also be provided on the top cover plate of the enclosure.
a. The coating is applied using electrostatic powder spraying with epoxy resin.
b. The busbars and conductive components are all made of high‑conductivity copper.
c. Use copper wires for insulated conductors, and employ multi‑strand copper stranded wire for the insulation of auxiliary circuits.
d. Embossing at the tinned busbar connection points.
Main Technical Parameters
Rated insulation voltage: 660V
Rated frequency: 50 Hz
Rated short-time withstand current: 10 kA
Enclosure protection rating: IP3X
Rated operating voltage: 380V
Rated current: ≤400A
Rated peak withstand current: 17 kA
Ordering Instructions
1. System diagram of a single-line scheme and cabinet arrangement diagram.
2. The wiring principles for secondary circuits shall follow the terminal arrangement diagram; if no terminal arrangement diagram is provided, adhere to the manufacturer’s specifications.
3. Order Quantity;
4. User requirements for electrical appliances, such as the color and material of the enclosure, installation method, and protection rating.
Keywords:
XL-21 Power Distribution Box (Cabinet)
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East of the 22nd Avenue and south of Fengda Road, Zhengzhou Economic and Technological Development Zone
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