BHD51 Series Explosion-proof Junction...

◆ Constructed with a high-strength copper-free aluminum alloy, this explosion-proof junction boxes features robustness, corrosion resistance and a high protection level (IP66).
◆ The flameproof junction box treated with anti-static coating and all fasteners are anti-loosening.
◆ Use flameproof junction enclosure and sealed structure to contain and isolate any potential electric sparks or high-temperature faults that may occur at cable connections within the enclosure.
◆The IP66 rating prevents internal component of the ex junction boxes aging and corrosion, which extends system life and lowers maintenance costs.

TECHNICAL DATA

Standards: CENELEC, IEC, NEC.
Zones: Zone 1 and Zone 2; Zone 21 and Zone 22; Class I, Zone 1 and Zone 2; Class I, Division 1, Groups A, B, C, D.
Explosion Protection Ratings:
- IECEx (Gas and dust): Ex db IIC T6 Gb; Ex tb IIIC T80°C Db.
- ATEX (Gas and dust): II 2 G Ex db IIC T6 Gb; II 2 D Ex tb IIIC T80°C Db.

Product Type: BHD51.
Material:
- Enclosure: Copper-free Aluminium Alloy, powder coated surface.
- Exposed fastener: Stainless steel.
Enclosure Color: Yellow (RAL1021).
Terminal Data: Number 6 terminals (Type A~E), 4 terminals (Type F); Cross section of cable 0.2-2.5mm².
Electrical:
- Rated voltage: Max. 690V AC 50/60Hz; Max. 500V DC.
- Rated current: 20A.
Protection:
- Degree of protection: IP66.
- Ambient temperature: -60°C ~ +60°C.
Earthing: Internal & external earthing: M5.
Cable Entries: Standard M☐ x 1.5 plugs; NPT☐ plugs on request.
Cable Glands: Optional, DQM-II (Ex d) or DQM-III (Ex d) is recommended.

Explosion-Proof Junction Boxes are engineered for hazardous environments including petrochemical, natural gas, coal, metallurgy, military, nuclear power, aerospace, firefighting, and more.
Safety Role: They act as a critical link in modern industrial safety frameworks, providing physical isolation and energy control for electrical connections.
Durability: Built with a robust explosion-proof structure to deliver long-lasting, corrosion-resistant performance in harsh conditions with high temperatures, heavy dust, and corrosive gases.

Certifications: Certified to ATEX, IECEx, EAC, and other stringent global standards.
Performance: Features a T5~T6 temperature rating and IP66 protection.
Support: Warom offers a seamless, end-to-end service from initial design assessment to final certification and global logistics.

Q1: What are the principles of explosion-proof junction boxes?
- A: They are based on two main types: Flameproof (Ex d), which uses precision gaps to cool flames, and Increased Safety (Ex e), which prevents arcs and sparks through enhanced insulation.
Q2: Are the terminal boxes in need of regular maintenance?
- A: Yes; critical checks include inspecting flameproof surfaces for damage, ensuring tight fasteners, and replacing damaged parts with original factory spare parts to restore protection grades.
Q3: Can internal wiring be conducted carelessly after installing the ex-terminal boxes?
- A: Absolutely not; the box only provides “containment,” and internal electrical connections must strictly comply with electrical standards and other equipment must also be explosion-proof.
Q4: Is it fully waterproof/dustproof?
- A: This depends on the IP rating; typical hazardous location junction boxes (IP66/67) resist powerful water jets or temporary immersion.

Description	Document Type	Language	Download
BHD51 Series Explosion-proof Junction Boxes	PDF
BHD51 selection table	PDF
W7-02.BHD51_IECEx CQM 11.0022X Issue No.2	PDF