Maintenance power boxes
- Sockets: CEE industrial sockets (3P+E / 2P+E), keyed against mismating, mechanically retained, IP54 cover
- Protection: independent ground fault (30 mA) + circuit breaker per circuit; a fault trips only that circuit
- Mixed output: 380V (16/32 A) and 220V (16 A) arranged as required
- Configuration: wall-mount / portable (wheels and handle)
- Enclosure: cold-rolled steel or stainless steel, IP54 / IP65 (washdown areas)
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.
| Enclosure type | Wall-mount / portable (wheels + handle, optional cable reel) |
|---|---|
| Standard dimensions (W×H×D) | 400×500×200 to 600×800×250 mm, custom builds available |
| Enclosure construction | 1.5 mm cold-rolled steel or 304 stainless steel (corrosive environments) |
| IP rating | IP54 standard / IP65 (washdown areas), sockets with splash covers |
| Door and lock | Top-hinged door (rain-shedding); no need to open it fully to plug in |
| Cable entry | Bottom cable gland entry; portable units supplied with rubber-sheathed cable |
| Rated voltage | AC 380V / 220V, 50 Hz |
|---|---|
| main breaker | Isolator + circuit breaker (≤63 A) |
| Socket specifications | CEE 380V 16/32 A (3P+E), CEE 220V 16 A (2P+E) |
| Branch circuit protection | Dedicated breaker + 30 mA residual current module per circuit; trips that circuit only |
| Indication | Power indicator; optional run indicator per circuit |
| Equipotential bonding | Enclosure grounding terminal clearly marked; PE bonded reliably to the enclosure |
| Component brands | Chint / Schneider / ABB sockets and breakers; customer-supplied components accepted for factory fit |
| Workshop maintenance type | Wall-mounted along the wall; one unit every 15–20 m in the mechanical repair area |
|---|---|
| Warehouse and logistics type | Power takeoff for charging and packaging equipment, mainly 220V |
| Outdoor site type | Portable with rubber-sheathed cable, IP65 |
| Production line workstation type | Fixed installation beside the workstation; power takeoff for power tools and test instruments |
| Dock and wharf type | Stainless steel enclosure with salt-spray protection; fully protected CEE |
| Assembly standard | GB/T 7251.1 / IEC 61439-1; sockets to GB/T 3828 / IEC 60309 |
|---|---|
| Ground fault verification | Verify residual current tripping circuit by circuit with the test button and record results |
| Routine tests (every unit) | Insulation resistance, dielectric withstand, circuit-by-circuit energization and residual current tripping |
| Temperature rise | Socket terminals and breaker connections ≤70 K |
| 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.
One-to-one ground fault protection
Independent ground fault module per circuit: a fault on one circuit trips only that circuit, the rest keep running. A single main ground fault device costs less, but one trip shuts everything down — the last thing you want on a maintenance site.
No exposed sockets
Every socket gets a splash guard, so rain and dust stay out through the plug-in gap. Interlocked guard-and-socket designs are preferred, with no reduction in mis-insertion protection.
Water stays out
Outdoor doors use top hinges: rain runs off the door instead of into the box; the door gasket seals to IP54 or better.
PE first
Enclosure grounding terminals are labeled and placed up front, and the PE-to-enclosure bond is continuity-tested on every unit — on temporary power, the worst case is an energized enclosure nobody knows about.
Ground fault test button pressed on every unit
Every ground fault module is factory-tested by pressing the test button, one by one, verified to trip at 30 mA with no compromise; both trip and no-trip results are recorded.
Rubber cable + reel
Mobile units come with rubber-sheathed cable and a reel, so cable stays organized and off wet ground; the reel has a brake and locks as soon as it is pulled out.
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 maintenance bay
Power for power tools and test instruments, distributed along the wall.
Warehouse and packing area
Packaging machines and charging tools, mostly 220V.
Outdoor job site
Mobile power take-off, IP65 rain and dust protection.
Shipyard and dock
Stainless steel + salt-fog protection, fully guarded CEE.
Production line workstation
Fixed power take-off at the workstation — plug tools in and go.
Washdown bay
Food processing and livestock washdown environments — IP65, 30 mA ground fault protection on every circuit.
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 is a CEE socket different from a standard socket?
CEE industrial sockets have keyed slots that prevent mismating (different voltages use different pin configurations, so you can't plug into the wrong supply), mechanical retention (they don't work loose under vibration), and a high splash rating. Their plug/cycle life is an order of magnitude higher than residential sockets. This is the long-standing standard for industrial environments — don't use residential power strips on the shop floor.
What does 30 mA ground fault protection actually mean?
30 mA is the threshold for human safety: a ground fault above 30 mA trips in milliseconds, cutting power before a person is electrocuted. Each circuit on the maintenance box has its own 30 mA protection, so a fault on one circuit only shuts down that circuit — other workstations keep running.
How do I choose between portable and wall-mounted?
If the power take-off point is fixed, go wall-mounted (workshops, warehouses). If the work area moves (construction sites, shipyards, large-scale maintenance), go portable with wheels and rubber-sheathed cable. For portable units, add a cable reel — cables dragged on the ground and sitting in water are the number one cause of electrical shock on job sites.
Can I use it with a welding machine?
Manual welding machines can draw power from it without issue (size the socket and protection to the welder's input current). But the welder's own high inrush current can nuisance-trip the ground fault module — for welder circuits, specify a high-immunity ground fault device or a dedicated circuit, and state the application when ordering.
Can I add metering?
Yes: total metering (for billing) or branch-circuit metering (for internal cost allocation). The meter is supplied to the owner's or utility's specification; we provide the meter position and wiring.
Will condensation form outdoors in winter?
Yes — the day-night temperature swing is the main cause. For outdoor and cold-chain environments, specify an anti-condensation heater with thermostat control. No condensation inside the enclosure means no corrosion on components. The heater draws very little power and does not compromise the overall ingress protection.
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 the power take-off points and we'll configure the sockets to match
Send us your points and tool list (voltage / number of circuits / environment) and we'll provide a free socket box plan · quote within 24 hours. Direct from the source factory, MOQ 1 unit, 15–25 day lead time, 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.