The XL-21 Fixed Power Distribution Box Switchgear is a wall-mounted or floor-standing enclosed low-voltage power distribution cabinet, typically rated up to 630A. It features a fixed-type internal mounting structure — meaning all circuit breakers, contactors, meters, and terminals are permanently mounted on internal rails or mounting plates, rather than being withdrawable.
● Receives and distributes electrical power from a main incoming source to multiple outgoing branch circuits
● Provides overcurrent and short-circuit protection for downstream equipment using moulded case circuit breakers (MCCBs) or miniature circuit breakers (MCBs)
● Enables local control of motors, lighting circuits, and other loads via push buttons or selector switches mounted on the door
● Houses metering and monitoring devices such as ammeters, voltmeters, and digital power meters
● Isolates circuits for safe maintenance using a main incoming switch or circuit breaker
| Product Name | XL-21 Fixed Power Distribution Box Switchgear |
| Rated Voltage | AC 380V / 400V / 415V, customized |
| Rated Current | 100A, 250A, 400A, 630A |
| Rated Frequency | 50Hz / 60Hz |
| Short-time Withstand Current | Customized according to project requirements |
| Protection Grade | IP30 / IP40 / IP54 optional |
| Installation Type | Wall-mounted or floor-standing |
| Cabinet Material | Cold-rolled steel plate, powder-coated |
| Busbar Material | Copper or aluminum, customized |
| Cable Entry | Top / bottom / side entry |
| Applicable Standard | IEC 61439, GB/T 7251, or customized standard |
The XL-21 Fixed Power Distribution Box Switchgear can be manufactured according to IEC 61439, GB/T 7251 and project-specific technical requirements. Lugao Power supports factory routine tests before shipment, including insulation resistance test, power-frequency withstand voltage test, wiring inspection, mechanical operation test and visual inspection.
Unlike larger withdrawable switchgear, the XL-21 is designed for applications where circuit changes are infrequent and simplicity is valued over modular flexibility. Its fixed design offers lower initial cost, smaller footprint, and easier installation. In essence, the XL-21 distribution cabinet is the workhorse of small to medium power distribution — dependable, uncomplicated, and economical.
The XL-21 Fixed Power Distribution Box Switchgear offers several compelling advantages that make it the preferred choice for fixed distribution applications.
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Advantage |
Description |
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Lowest initial investment |
No costly draw-out mechanisms, shutter assemblies, or complex interlocks. The fixed mounting design significantly reduces manufacturing and component costs. |
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Compact footprint |
Vertical mounting of components and efficient internal layout allows more circuits per square meter than withdrawable alternatives. Saves valuable electrical room space. |
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Simplified installation |
Pre-punched mounting rails and standardized cutouts eliminate the need for custom drilling on site. Most cabinets ship fully assembled or in minimal knockdown form. |
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Easy component access |
All devices are mounted on internal plates or DIN rails. Replacing a faulty breaker takes minutes — open the door, disconnect wires, unclip the breaker, clip in a new one. No special tools required. |
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Rugged welded construction |
Unlike bolted-frame cabinets, the XL-21 uses continuous welded seams on the main frame and corners. This provides superior rigidity and vibration resistance for harsh industrial environments. |
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Flexible incoming/outgoing options |
Cable entry from top, bottom, or both sides. Main incoming can be a switch-disconnector, MCCB, or ACB depending on current rating. |
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Proven reliability |
Simple designs fail less often. The XL-21 power distribution box has decades of field service history across thousands of installations worldwide. |
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Easy to expand |
Adding a new circuit requires only mounting a new breaker on available DIN rail space and connecting cables. No need to add entire vertical sections. |
The low voltage power distribution panel incorporates the following distinctive features that differentiate it from competing fixed distribution boxes.
Welded frame with dual coating: The main frame is constructed from 1.5mm to 2.0mm cold-rolled steel with continuous CO₂ shielded arc welding at all joints. After welding, the entire enclosure undergoes degreasing, phosphating, and electrostatic powder coating (minimum 70μm) in RAL 7035. This dual-layer protection significantly outperforms riveted or bolt-assembled boxes in corrosive environments.
Hinged door with 130° opening: The front door is fitted with heavy-duty stainless steel hinges allowing 130° opening, plus a three-point locking mechanism (top, middle, bottom) with a DIN standard handle. A transparent instrument window is provided for meter reading without opening the door.
Removable side and rear panels: Both side panels and the rear panel are removable using a standard hex key. This allows 360° access to internal components during installation or maintenance — a feature rarely found in low-cost distribution boxes.
Universal mounting rails: Internally, the cabinet is fitted with both perforated mounting plates (for screw-mounted devices) and top-hat DIN rails (for snap-on devices). This dual-system design accommodates any brand of MCCB, MCB, contactor, or terminal block.
Integrated neutral and earth busbars: Factory-installed copper neutral bar (full capacity) and earth bar (half capacity) run the full height of the enclosure, with pre-drilled connection points every 50mm. No need to add separate busbars on site.
Cable management system: Vertical cable troughs on both left and right sides, each with removable covers. Cable entry/exit knockouts are provided on top, bottom, and both side walls. A separate control wiring duct separates low-voltage wiring from power cables.
Incoming isolation switch with door interlock: The main incoming switch handle is mechanically interlocked with the front door — the door cannot be opened unless the main switch is in the OFF position. This safety feature prevents accidental contact with live parts.
Silk-screened circuit labeling: Every circuit position is clearly labeled on the inner mounting plate using wear-resistant silk-screened printing. Labels do not fade or peel off like adhesive stickers.
The XL-21 Fixed Power Distribution Box Switchgear is widely used across the following sectors:
● Industrial plants – Machine shops, assembly lines, material handling equipment, welding stations (typically 100A–630A feeders)
● Commercial buildings – Shopping malls, office floors, retail stores, restaurants (lighting and general power distribution)
● Residential complexes – Apartment building floor distribution, community facilities, parking lot lighting
● Infrastructure – Tunnel lighting, toll station power, street lighting control cabinets
● HVAC systems – Main distribution for chiller plants, air handling units, pump rooms
● Temporary site power – Construction trailers, event power distribution, film production sets
In all these scenarios, the electrical distribution cabinet provides a balance of cost, reliability, and ease of maintenance that more complex switchgear cannot match.
The XL-21 fixed power distribution box can usually be configured from 100A to 630A according to the project load and circuit design.
Yes. We can customize the layout of MCCBs, MCBs, contactors, meters, terminals, busbars and cable entry positions according to your single-line diagram.
Please provide rated voltage, rated current, number of incoming and outgoing circuits, breaker specifications, protection grade, installation type, quantity and destination port.
Yes. Lugao can provide layout drawings, wiring diagrams and technical confirmation documents before production for customer approval.
Standard XL-21 cabinets are mainly used indoors. For outdoor applications, we can customize higher IP protection, rainproof structure and anti-corrosion coating.
Individual packaging: Each cabinet is wrapped in VCI anti-rust paper, then bubble wrap, then stretch film, and finally placed in a 10mm plywood crate with steel edge protectors.
Shipping terms: FOB Ningbo, CIF major ports, or Ex-works.
Lead time: 15 working days for standard configurations (up to 10 units).
● Warranty period: 12 months from commissioning or 18 months from shipment, whichever comes first.
● Coverage: Manufacturing defects including frame weld cracking, coating failure (non-abrasive), faulty door interlock, and wiring errors.
● Exclusions: Damage from improper installation, overloading beyond rated current, physical impact, corrosion from chemicals not specified, or force majeure.
Address
No. 19, Keaisi Road, Xiangyang Industrial Zone, Liushi Town, Yueqing City, China
Tel
Share your specs: Voltage level (e.g., 11kV, 33kV), rated capacity (kVA/MVA), and installation environment (Indoor/Outdoor).
Our engineering review: We analyze your load profile and short-circuit requirements (2-4 hours).
Deliverables: You'll receive a preliminary GA drawing, technical datasheet, and commercial offer within 24 working hours.
