Stainless steel distribution boxes
- Material: 304 / 316L stainless steel available; 316L offers better salt and acid resistance, suited to coastal and chemical environments
- Welding: TIG welding + pickling and passivation — welds do not rust, no weld scars on the surface
- Sealing: door gasket + cable glands, IP65 protection optional
- Surface: brushed / 2B mill finish, easy to clean, suitable for direct washdown in food and pharma workshops
- Customization: dimensions, cutouts, and mounting method built to drawing
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.
| Material | 304 / 316L stainless steel, sheet thickness 1.2–2.0 mm selected according to enclosure size |
|---|---|
| Installation | Wall-mounted / Floor-standing / Flush-mounted; wall-mounted units come with mounting holes or a back plate |
| Standard dimensions | Wall-mounted: 300×400×200 to 800×1000×300 mm; floor-standing: up to 1000×800×2000 mm, custom sizes available |
| Welding Process | TIG welding + pickling and passivation; no weld scars, no rust points |
| Surface treatment | Brushed / 2B mill finish, protective film optional; no powder coating (natural stainless finish retained) |
| IP rating | IP54 / IP65 (door gasket + cable glands + hinge sealing) |
| Door and lock | Single door / double door, multi-point lock or flush lock, transparent viewing window optional |
| Cable entry | Bottom cable glands / side cutouts, sealed; quantity and position built to drawing |
| Application | Power distribution / control / metering / combined; internal components configured to drawing |
|---|---|
| Rated voltage | AC 380V / 400V or DC, depending on application |
| Component configuration | Circuit breakers, contactors, relays, PLC, VFD, terminal blocks, etc., assembled to drawing |
| Mounting plate | Galvanized or stainless steel mounting plate, adjustable position, components arranged in separate rows |
| Grounding | Stainless steel enclosure grounding terminal, grounding continuity tested |
| Component brands | Schneider / ABB / Siemens / Chint, or as specified on the drawing |
| Outdoor power distribution box | Power distribution for outdoor motors, pumps and fans — 304 stainless steel + IP65 |
|---|---|
| Food & pharma plant enclosure | 316L stainless steel, washdown-friendly, power distribution and control for hygienic environments |
| Chemical corrosive environment enclosure | 316L or added anti-corrosion treatment, resistant to acid and alkaline gases |
| Coastal & port enclosure | 316L salt-spray resistant, power distribution for dockside and offshore equipment |
| Meter Box | Stainless steel meter box, outdoor tamper-resistant and rainproof |
| Control box | Local control box, pushbuttons and indicator lights mounted on the door |
| Reference standards | GB/T 7251.1 / IEC 61439-1 (assemblies); GB/T 7251.3 (distribution boxes) |
|---|---|
| Material standard | 304 meets GB/T 20878 / ASTM standards; 316L contains molybdenum for salt and acid resistance |
| IP rating | GB 4208 / IEC 60529, IP65 optional |
| Insulation resistance | ≥1 MΩ (500V megohmmeter) |
| Power frequency withstand voltage | Main circuit 2500V / 1 min, control circuit 1500V / 1 min |
| Factory tests | Circuit check, dielectric withstand, grounding continuity, seal inspection, powered functional test |
| Documents with shipment | Electrical schematic, component list, BOM with brand and model, test report, factory photos |
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.
Molybdenum for salt and acid resistance
316L adds molybdenum to 304, giving noticeably better salt-spray and acid/alkali resistance. In coastal, chemical and food environments, the extra material cost pays for itself within a few years.
Post-weld pickling and passivation
Pickling and passivation after TIG welding keeps welds rust-free and the surface uniform. Poor weld treatment means the weld spots rust first and the whole enclosure is wasted.
Retains natural stainless steel finish
Stainless steel enclosures are not powder coated — the brushed or 2B natural finish is retained, easy to clean and washable. That is exactly what food and pharma plants need.
Fully sealed door seams and cable glands
Door gasket + cable entry glands + hinge seals — that is what makes IP65 real. A nominal IP rating without sealing detail means nothing.
Cutouts and dimensions to drawing
Dimensions, cutouts and mounting are all built to drawing. Stainless steel enclosures are mostly custom builds for a specific environment; standard units often do not fit.
No dead corners, easy washdown
Bends and welds are ground smooth with no dirt-trapping corners. Hygienic environments can be hosed down directly — no bacteria, no rust.
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.
Outdoor & open-air
Outdoor power distribution and control for rain and sun exposure.
Food & Pharma
Washdown and hygienic power distribution and control for production areas.
Chemical & Corrosive
Power distribution for acid, alkali and corrosive environments.
Coastal & Port
Power distribution for dockside and offshore equipment in salt-fog environments.
Water & Wastewater Plants
Power distribution for pumps and treatment equipment in wet, corrosive environments.
Metering & Tamper Resistance
Outdoor meter box, theft-resistant and rainproof.
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 I choose between 304 and 316L?
For ordinary outdoor and damp environments, 304 is sufficient. For coastal salt fog, chemical acid and alkali, or aggressive food-plant cleaning agents, choose 316L. The test is one question: will salt, acid, alkali or strong cleaning agents be acting on it long term? If yes, go with 316L.
Will a stainless steel enclosure rust?
Under normal conditions, 304/316L will not rust. But rust spots can appear if the welds were not pickled and passivated, if the surface was scratched and contaminated by iron tools, or if non-stainless fasteners were used. We TIG weld plus pickle and passivate, and we use stainless steel fasteners, which eliminates these man-made rust spots.
Can it be hosed down directly?
IP65 rated units can. The door seams and cable entry points are sealed, so washdown water cannot get in. But tell us whether washing is a daily routine or occasional, and we will reinforce the sealing and select a more suitable enclosure type accordingly.
Can you build it to my dimensions and cutouts?
Yes. Stainless steel enclosures are essentially all custom builds. Send us the dimensions, cutout positions, mounting method and cable entry requirements, and we will produce after issuing drawings for your confirmation.
Can a PLC or VFD be installed inside?
Yes. A stainless steel enclosure can serve as pure power distribution, or house a PLC, VFD and contactors for control. Note that VFD heat must be managed; we can provide a thermal solution or use a larger enclosure.
What do you need for a quote?
Material (304/316L), dimensions or bill of materials, mounting method, ingress protection (IP) rating, cutout and cable entry requirements, and operating environment. Drawings are best; if you do not have them, we will develop a solution from your bill of materials.
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.
Water, salt, acid or alkali in the environment? The right material is what holds up.
Send us your operating environment and bill of materials for a free stainless steel enclosure solution and material recommendation · 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.