As a full-service sheet metal enclosure manufacturer, we fabricate precision sheet metal electrical enclosures and parts for almost every industry — from electronics and automotive to machinery and construction.
As a leading electrical enclosure manufacturer, we specialize in custom electrical enclosures and cabinets — IP66-sealed, salt-spray 1000h+, thermal-optimized, and UL/CE/IEC compliant.
From free CAD design to mass production, fully in-house — as a control panel enclosure manufacturer, we serve OEM and ODM projects worldwide.
Overseas buyers of custom electrical enclosures and control panel enclosures lose money to the same six failures — water ingress, corrosion, EMI leaks, overheating, impact damage, and compliance rejection. Here's exactly how our engineering eliminates each one.
Overseas buyers of custom electrical enclosures and control panel enclosures lose money to the same six failures — water ingress, corrosion, EMI leaks, overheating, impact damage, and compliance rejection. Here's exactly how our engineering eliminates each one.
Custom sheet metal enclosures for outdoor power distribution, low/high-voltage switchgear, substation control cabinets, and utility junction boxes. Built for decades of service in sun, rain, salt air, and public-access exposure — with gland-plate cable entry, EMC shielding, and IK-rated impact resistance. Fabricated from 1.5–2.0mm SPCC/SGCC or 304/316 stainless with a UV-stable RAL 7035 polyester powder coat, every cabinet ships with MTRs, REACH declarations, and complete first-article documentation. Optional thermal management — louvres, breather drains, filter-fan mounts, or sun-shield roofs — keeps internal temperatures within your component ratings.
From raw steel coil to finished cabinet, every critical process stays under our roof. No outsourced cutting, no third-party welding shops — just controlled quality, repeatable tolerances, and full material traceability.
Clean, dross-free edges on steel, stainless, and aluminum sheets — the first step to repeatable enclosure geometry.
Tight-radius forming for door frames, mounting rails, and sealed gland channels — ±0.1° angle control.
Consistent penetration on cabinet frames and cabinet seams, with post-weld grinding for paint adhesion.
Zinc-phosphate pre-treatment + UV-stable polyester powder coat for 1000h+ salt-spray protection outdoors.
Digital calipers, height gauges, and go/no-go fixtures at every stage — so spec sheets match reality.
15,000m² under one roof: laser, bending, welding, coating, assembly — and full lot traceability.
Curated real-world outdoor power project examples manufactured via our in-house laser cutting, bending, welding and coating workflows. Each case highlights our delivered engineering advantages, rather than standard catalog part numbers.










Every enclosure is engineered against the standards your market demands — with drawing packages, material certs, and test reports ready for your inspector. No surprises at the certification stage.
Overseas buyers of custom electrical enclosures and control panel enclosures lose money to the same six failures — water ingress, corrosion, EMI leaks, overheating, impact damage, and compliance rejection. Here's exactly how our engineering eliminates each one.
Sealed IP66 boxes don't have to overheat. Our engineers simulate convection, place louvres, breather drains, and filter fans against your power-dissipation budget — before any steel is cut. Validated against field operating temperatures.
Every prototype cabinet undergoes water-jet and immersion validation per EN 60529. Gasket groove geometry, door flatness, and compression set are engineered for 10-year sealing integrity — not just a passing lab test.
For marine and chemical environments, we offer 316/316L stainless with electropolished or passivated finishes — verified at 1000h+ neutral salt spray. Your cabinets survive where 304 pits and fails.
All processes from blanking to IP validation are performed in-house at our 5,000m² facility. AMADA equipment, ISO quality system, and 50+ skilled workers — so your enclosures never leave our control until they're fully finished and packed.
In-house engineers convert your concept to production-ready CAD — with thermal, structural, and sealing analysis. DFM optimization and unlimited revisions, all free. No drawing needed from you.
AMADA CNC laser and turret punch for cabinet panels, doors, and precision sheet-metal blanks. Minimal HAZ, clean edges, ready for bending — including pre-cut gasket grooves and gland-plate cutouts.
CNC press brakes for door flatness, enclosure rigidity, and double-bend gasket-seating profiles. Back-gauge repeatability ensures every cabinet door seats identically — critical for sealing.
AWS D1.1 full-penetration welds for structural cabinet frames and equipment racks. Continuous fillet welds for EMI-tight seams. Robotic + manual cells.
UV-stable powder coat (RAL/Pantone matched), zinc-nickel plating on hardware, electropolish/passivation for 316SS, and electrophoresis — all rated for 1000h+ salt spray on outdoor enclosures.
Precision-cut EPDM/silicone gaskets, EMI finger-stock and conductive elastomers, cable glands, locks, hinges, multi-point latches — all installed and validated for IP66/IK10 performance.
Louvre forming, heat-sink bonding, breather-drain installation, and filter-fan mounting — based on CFD-validated airflow design matched to your component heat load. Sealed without overheating.
IP water-jet testing, salt-spray chambers, CMM measurement, and FAI. Full documentation: MTR, REACH, DIR, FAI reports — plus third-party SGS/TÜV inspection on request.
Every material is chosen for its corrosion, thermal, or electrical role in outdoor power enclosures. Mill Test Reports and REACH declarations included with every batch — full traceability, always.
These figures are based on actual factory records from 2010 to present.
No design drawings? No problem. We handle the full workflow — from your spec to a fully finished, documented, export-packed enclosure.
Upload 3D CAD (STEP/IGES/DWG/DXF) or describe: enclosure function, dimensions, IP/IK rating, material, quantity, climate, and the standards it must meet. No drawing? We design it.
Engineers perform free DFM plus thermal and sealing analysis, then return a detailed quotation with pricing, lead time, and a compliance checklist for your target standards.
Upon approval, laser cutting, bending, welding, sealing, surface treatment, and assembly all happen in our factory — with photo updates at every stage. Zero sub-contracting.
IP/salt-spray testing, CMM FAI, and full documentation (MTR, REACH, DIR) included. Export-standard sea-freight packaging. DDP/FOB/CIF/EXW Incoterms — door-to-door available.
Overseas buyers of custom electrical enclosures and control panel enclosures lose money to the same six failures — water ingress, corrosion, EMI leaks, overheating, impact damage, and compliance rejection. Here's exactly how our engineering eliminates each one.
We needed 300 outdoor distribution cabinets for a coastal substation project. SanJun specified 316L stainless and passed 1000h salt spray on the first sample. Three years in, zero corrosion complaints from the field. Their gasket groove engineering is genuinely better than our previous EU supplier.
UL 508A documentation was the bottleneck with our last two vendors. SanJun delivered a complete compliance package — drawings, BOM, material certs, creepage calculations — with the first article. Our panel-builder certified the enclosures in days, not weeks. On-time delivery was 100%.
The deflagration venting design was the deciding factor. Their engineers reworked our battery box geometry to add directional relief paths and compartmentalized bays — our safety reviewer signed off without a single change request. The V-0 compatible structure passed UL review first try.
Share your spec, sketch, or target standard. Our engineering team responds with a DFM review, thermal/sealing analysis, and detailed quotation — guaranteed within 24 business hours.
The questions overseas enclosure buyers ask us most — answered honestly. If yours isn't here, message us directly.
💬 Still have questions?
WhatsApp our engineer directly: +86 135 3082 6471 Email: liameranne@gmail.comYes — our outdoor power cabinets are designed to UL 508A, IEC 61439, and EN 62208. We provide a complete documentation package: production drawings, BOM, material certificates, creepage/clearance calculations, and IP/IK test data — ready for your certifier's review. We do not issue the UL/CE mark ourselves, but we engineer to the standard and supply everything your inspector needs to certify.
Every prototype enclosure undergoes EN 60529 water-jet (IPX5/IPX6) and immersion (IPX7) testing in-house. We verify gasket groove geometry, door flatness, and compression set. For production batches, we conduct leak testing on a sampling basis and can perform 100% leak testing on request. Test reports are included with the shipment.
Our engineers use CFD simulation to model convection inside the enclosure against your component power-dissipation budget. We then specify louvre placement, breather drains, filter fans, heat-sink bonding, or finned profiles — before any steel is cut. The goal: IP66 sealed against water, but thermally managed so components don't derate or fail. You receive the thermal analysis with the design package.
Yes. We run neutral salt-spray testing in our in-house chamber — 316/316L stainless with passivated or electropolished finish routinely exceeds 1000h with no red rust. 304 stainless typically passes 500h+. Mill Test Reports (MTR) confirming the alloy grade and REACH declarations are included with every material batch, so your QA team can verify traceability end-to-end.
We sign a mutual NDA before any technical exchange. Your drawings, specs, and project details are confidential — never shared with third parties or used as portfolio material without written consent. All design files remain your property. We also isolate project data internally: only the assigned engineering and production teams access your files. Many of our long-term clients trust us precisely because we protect their IP.
First order: T/T 30% deposit, balance against BL copy. Established clients: T/T 30 days, L/C at sight, or L/C 60 days. PayPal accepted for samples. Trade Assurance via Alibaba available for new clients. Shipping: DDP, FOB, CIF, or EXW — we use trusted freight forwarders for sea and air, with export-standard wooden-crate packaging and moisture barriers. Door-to-door delivery is available on request.