Explosion-proof control cabinets
- Protection type: Ex d flameproof / Ex e increased safety / Ex p pressurized, selected by hazardous zone and gas group
- Control functions: equipment start/stop, interlocking, PLC logic, variable frequency speed control can be integrated
- Explosion-proof operation: explosion-proof operating handles, indicator lights and pushbuttons configured to explosion-proof requirements
- Qualification: produced in joint supply with an Ex-qualified manufacturer; Ex certificates available for verification
- Heat dissipation balance: heat dissipation and explosion protection balance design for heat-generating PLC/VFD components
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 of protection | Ex d flameproof / Ex e increased safety / Ex p pressurized, selected by hazardous zone and gas group |
|---|---|
| Hazardous area | Zone 1 / Zone 2 gas, Zone 21 / 22 dust (configured by classification) |
| Material | Cast aluminum / steel plate / stainless steel, selected by protection type and environment |
| Standard dimensions | Customized by number of circuits, control functions and protection type |
| Surface treatment | Explosion-proof surface treatment; weather-resistant and anti-corrosion for outdoor models |
| IP rating | IP65 / IP66 (in combination with the protection type) |
| Operating elements | Explosion-proof operating handles, indicator lights and pushbuttons configured to explosion-proof requirements |
| Qualifications | Manufactured and supplied in joint supply with an Ex-qualified manufacturer; Ex certificate available for verification |
| Control function | Equipment start/stop, interlocking, PLC logic, variable frequency speed control can be integrated |
|---|---|
| PLC integration | PLC control in an explosion-proof environment, laid out to explosion-proof requirements |
| VFD integration | Variable frequency speed control in an explosion-proof environment, with heat dissipation and explosion protection balance design |
| Explosion-proof rating | Ex d / Ex e / Ex p, gas group IIA / IIB / IIC, temperature class T1–T6 |
| Circuit configuration | Control circuits, components and cable entries customized to project and explosion-proof requirements |
| Grounding | Explosion-proof grounding requirements, grounding continuity testing |
| Equipment start/stop control | Local / remote start/stop control of equipment in hazardous areas |
|---|---|
| Interlock control | Safety interlocking control of equipment in hazardous areas |
| PLC control | PLC logic control for hazardous-area processes |
| VFD speed control | Variable frequency drive control of hazardous-area motors |
| Pressurized control cabinet | Ex p pressurized, high-capacity control in hazardous areas |
| Build to drawing | Control scheme custom-built to project and explosion-proof requirements |
| Reference standards | GB/T 3836.1–.4 (explosive atmospheres) series / IEC 60079 series |
|---|---|
| Type of protection | Ex d flameproof / Ex e increased safety / Ex p pressurized, per the relevant type standard |
| Gas group | IIA / IIB / IIC, temperature class T1–T6 |
| IP rating | GB 4208 / IEC 60529, IP65 / IP66 |
| Certification verification | Ex certificate available for verification; certification documents shipped with the goods |
| Factory tests | Explosion-proof construction inspection, control function, circuit check, dielectric withstand, grounding continuity |
| Documents with shipment | Electrical schematic, control logic description, explosion-proof certificate (for verification), BOM, 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.
Control functions inside explosion-proof construction
Start/stop, interlock, PLC and VFD functions go inside an explosion-proof enclosure, with explosion-proof operating elements. Control functions and explosion-proof requirements are engineered together — not a flameproof box with components stuffed in.
Heat balance for heat-generating components
PLCs and VFDs generate significant heat, so heat dissipation and explosion-proof integrity must be balanced in the design. If heat-generating components are not handled properly, excessive temperature inside the explosion-proof enclosure is itself a hazard.
Joint supply with a specialized manufacturer
Explosion-proof products are manufactured and supplied in joint supply with a specialized manufacturer holding Ex qualifications. Ex certificates are available for verification, and qualification documents ship with the order.
Explosion-proof operating elements
Handles, pushbuttons and indicator lights are all explosion-proof types. For operation in hazardous areas, ordinary components are an ignition source.
Cable entry via explosion-proof glands
Explosion-proof cable glands / sealing fittings are used for incoming and outgoing cables. With many control circuits, explosion-proof sealing at cable entries matters even more.
Custom-built to explosion-proof requirements
Control scheme, circuits, components and cable entries are all custom-built to project and explosion-proof requirements.
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.
Oil & Gas / Petrochemical
Control of equipment in hazardous areas of refining and storage facilities.
Pharma & Fine Chemicals
Process control in flammable solvent environments.
Gas & Energy
Equipment control for gas stations and LNG facilities.
Dust environment
Equipment control in dust hazardous areas.
Mining
Control in underground and surface hazardous areas.
Coatings & Spray Finishing
Equipment control in paint shops.
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
What is the difference between an explosion-proof control cabinet and an explosion-proof distribution box?
An explosion-proof distribution box is mainly for power distribution. An explosion-proof control cabinet adds control functions on top of distribution — start/stop, interlock, PLC and variable frequency drive control. The control cabinet must also address explosion-proof operating elements and heat balance for heat-generating components, so the technical requirements are higher.
Can PLC and VFD be integrated?
Yes. PLC logic and variable frequency speed control can be integrated in explosion-proof environments, but the heat dissipation versus explosion-proof balance has to be solved. Heat-generating components need dedicated design, and we handle that as part of the solution.
Do you hold explosion-proof certification yourselves?
Our explosion-proof products are manufactured and supplied in joint supply with an Ex-qualified manufacturer. We can provide the explosion-proof certificate for verification, and qualification documents ship with the goods. We will not pass off a cabinet without the proper certification as an explosion-proof cabinet.
How are operator components made explosion-proof?
Handles, pushbuttons and indicator lights are all explosion-proof types, and cable entries use explosion-proof cable glands. For operation in a hazardous area, ordinary components are a potential ignition source and cannot be used.
What applications suit pressurized (Ex p) protection?
Pressurized protection maintains positive pressure by supplying air to isolate hazardous gas, making it suitable for control cabinets with high capacity and many internal components. It is commonly used for high-capacity control and for locations requiring frequent maintenance.
What do you need for a quote?
Hazardous area classification, gas group, temperature class, control functions (start/stop, interlock, PLC, variable frequency drive), number of circuits and component requirements, installation environment. A hazardous area classification drawing is preferred.
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.
Need control in a hazardous environment? Confirm the explosion-proof type and certification first
Send us your hazardous area classification, gas group and control functions, and we will provide a free explosion-proof control cabinet solution · 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.