XL-21 power distribution cabinet
- Configuration: isolator or switch-fuse main incoming device plus branch breakers inside, single-front access, wall-mounted
- Main switch: ≤630 A (isolator or switch-fuse, with a visible break)
- Branch circuits: breaker + contactor + thermal overload for motor circuits, or breaker only for feeders
- Enclosure: 600/800 mm wide × 350/400 mm deep × 1700/1800 mm high, flexible module sizes
- Components: Schneider / ABB / Siemens / Chint; brand can be specified, or customer-supplied components shipped to our plant
Specifications
The table below covers 80% of factory distribution room cases. Anything outside it we can still build — those are engineered items, quoted separately, with an indicative price the same day.
| Type | XL-21 floor-standing power distribution cabinet, wall-mounted, single-front access |
|---|---|
| Standard sizes (W×D×H) | 600×350×1700 / 800×400×1800 mm, custom sizes available |
| Enclosure construction | 2.0 mm cold-rolled sheet steel, bent and welded, front door plus fixed mounting plate |
| IP rating | IP30 / IP54 (dusty workshops) |
| Door layout | Operating handles, pushbuttons, indicator lights and ammeters arranged by circuit |
| Cable entry | Cable entry from top or bottom, optional busbar at the cabinet top |
| Rated voltage | AC 380V / 400V, 50 Hz |
|---|---|
| main breaker | Isolator / switch-fuse ≤630 A, with a visible break |
| Branch feeder | Molded case / miniature circuit breakers, 4–12 circuits |
| Motor circuits | Breaker + contactor + thermal overload relay, local / remote start-stop |
| Metering and indication | Voltmeter / ammeter / three-phase indication, fitted per cabinet |
| Top-mounted busbar | Top-mounted busbar runs through when multiple cabinets are lined up (same module assembly) |
| Component brands | Schneider / ABB / Siemens / Chint; customer-supplied components accepted for factory installation |
| Production line type | One cabinet per production line — a fault is serviced without crossing lines |
|---|---|
| Pump room power type | Pump group branch circuits + automatic level control loop |
| AHU room type | Local control for AHU and fan branch circuits |
| Dedicated equipment cabinet type | Dedicated cabinet for a single large equipment item (air compressor / refrigerated dryer / line body) |
| Lined-up assembly type | Same-module cabinets with top-mounted busbar running through — shop floor distribution row |
| Assembly standard | GB/T 7251.1 / IEC 61439-1 |
|---|---|
| Routine tests (every unit) | Insulation resistance, dielectric withstand and circuit-by-circuit energization and operation tests |
| Temperature rise | Terminal and busbar connections ≤70 K |
| Isolation verification | Main disconnect open position and door interlock verified cabinet by cabinet |
| Documents with shipment | System diagram, terminal schedule, BOM, test report |
Five steps to specify your run
A configuration summary is generated as you go. It travels with your inquiry, saving a round of confirmation.
Build details
Systems have been in service for decades, and the failure points are always the same few: poor busbar contact, water ingress at the door seal, high temperature rise in the correction cabinet, and mis-phased outgoing feeders. The six hard rules below are written for exactly these points — every cabinet can be traced to them.
Visible disconnect
Main incoming uses a disconnect switch or switch-fuse: after opening, the break is visible and lockout/tagout is straightforward — a traditional XL-21 advantage, and we do not cut this component.
Wall-mounted to save space
All internal components are front-mounted for single-side maintenance when installed against a wall: saves one meter of space versus a double-side maintenance cabinet where shop aisles are tight.
Operate without opening the cabinet
Pushbuttons, indicator lights and ammeters are all door-mounted: daily operation needs no cabinet door to be opened, cutting live-open risk to zero.
Pre-fabricated parallel busbar
When multiple cabinets are lined up, the top-mounted busbar is factory pre-fabricated to run through with a constant cross-section — on site, align and bolt up, then power on.
Energized operation checked one by one
Every circuit gets an energized operation test, with contactors and protection settings verified at the same time — the XL-21 is inexpensive, but factory testing is not where we cut corners.
Off-the-shelf parts, repairable anywhere
Every component inside the cabinet is a standard commercial part — the kind of model number you can buy at a small-town hardware store. Full drawings and BOM included, so repairs are never blocked by proprietary parts.
Photos & enclosure construction
Below are photos taken in our own shop — from the complete unit down to the internal busbars and secondary wiring. Every build detail can be checked item by item.
Image key: 01–05 are shop photos (the numbers match the shot list). The line drawing shows the front elevation of the enclosure; dimensions match the specification table above.
Where these cabinets go
These are the routine applications — we can talk scheme and configuration directly. For the industry view, see the industry pages.
Workshop production line distribution
One cabinet per line, distributing and controlling power right where it is needed.
Pump rooms and water treatment
Branch circuits for pump groups with automatic liquid level control.
Air compressor rooms
Local distribution for air compressors and downstream treatment equipment.
HVAC and boiler rooms
Branch circuit control for unit fans.
Warehouses and logistics
Power distribution for conveying and lifting equipment.
Old workshop retrofit
Replace old cabinets using standard XL-21 module sizes — mounting positions stay unchanged.
Commercial terms
Specification dated September 2026; quotations follow this.
| Drawings & design | Free |
| MOQ | 1 unit (5 or more recommended for production) |
| Production lead time | 15-25 days after drawing approval |
| on-time delivery | 98% |
| Warranty | 12 months |
| Loading port | Ningbo / Shanghai, China |
| Component brands | Schneider / ABB / Siemens / Chint |
| Factory visit & dispatch confirmation | Factory visits welcome; finished-cabinet photos and video before dispatch |
| Capacity | 5,800+ units / year |
Documents for your engineering team
Selection manual, outline dimensions and RFQ checklist — for the customer's electrical engineer. All three documents are being organized by product line; download links go live once complete.
Six questions procurement and electrical engineers ask most
How do the XL-21 and GGD divide the work?
Position and role: the GGD sits in the electrical room handling the main incoming line, metering and power factor correction (larger cabinet, heavier busbar, can be coupled into sections); the XL-21 sits on the workshop floor handling local distribution (smaller cabinet, lower cost, single-front access against a wall). Typical architecture: electrical room GGD → workshop XL-21 → equipment.
Why insist on an isolator switch as the main switch?
A visible break point: after isolation for maintenance, you can see the open contacts, and lockout/tagout has a physical anchor. A breaker gives no visible indication of its internal state. The isolator's visible break is an XL-21 safety tradition — that is not where you save money.
How many circuits can one cabinet carry?
An 800 mm wide cabinet typically handles 4–8 circuits (including motor circuits) or 10–12 pure feeder circuits; beyond that, either move to a double-front cabinet or split into multiple cabinets. Heat dissipation and operating space are hard constraints — we lay out circuits according to your circuit list.
Can automatic control be added?
Yes: automatic start/stop circuits for liquid level, pressure or temperature, or a small PLC for simple interlocking — the XL-21 door face and internal space both leave room for it. Send your control requirements along with the circuit list.
Is the cabinet dust-tight?
Standard is IP30 (adequate for a normal workshop). For high-dust environments (woodworking, foundries, cement), upgrade to IP54: gasketed door seals, cable glands on all entries, and filtered fans. For washdown environments, choose a stainless steel outdoor box.
How long is the shutdown for a cabinet replacement in an old workshop?
For a cabinet replicated 1:1 from your circuit list, on-site changeover and wiring typically takes half a day to one day per cabinet: incoming and outgoing positions and terminal numbers are drawn to match the old cabinet, and cables reconnect in place. Schedule the retrofit window in advance — we will align our delivery schedule with it.
Other cabinet types in the same main circuit
Related products use color-block placeholders for now (product photos not yet complete; they will be replaced together). Internal links will be filled in once live URLs are confirmed.
Send us your circuit list and the internal layout will follow it
Send us your circuit list (equipment / capacity / control requirements) and we will provide a free XL-21 layout proposal · quotation within 24 hours. Direct from the source factory, MOQ 1 unit, 15–25 day delivery, 1-year warranty.
ISO 9001:2015 · CE(LVD+EMC) · CQC · IP65
When you write, include: single-line diagram or primary scheme, switch room layout, load list, and component brand requirements. You do not need complete drawings — capacity and cabinet type are enough to start.