LD-FBJX Series Explosion-Proof Junction Box (Ex d IIB / DIP)

Product Features

The explosion-proof junction box is designed and manufactured in strict accordance with GB/T 3836.1 Explosive Atmospheres Part 1：Equipment – General Requirements, GB/T 3836.2 Explosive Atmospheres – Part 2： Equipment Protection by Flameproof Enclosure “d”, and additionally references GB/T 3836.31 Explosive Atmospheres – Part 31：Equipment Dust Ignition Protection by Enclosure “t”.

Material：Carbon steel or stainless steel, precision-formed by argon-shielded welding.

Surface treatment：Coating (powder coating) or chemical treatment. Cable entry/exit：Equipped with certified explosion-proof cable glands.

The direction and specifications of cable entries and exits can be designed in accordance with customer requirements.

Special instructions for use：Cable glands or stopping plugs installed with this product shall be suitable for the corresponding explosion protection type and shall hold a valid CCC certificate.

The flameproof joints are not intended to be repaired.

Product Advantages

01

Superior Flameproof Safety and Reliability

Flameproof Protection Type (Ex d):
Utilizes a high-strength enclosure to contain any internal explosion. Even if ignition occurs inside, it will not ignite the surrounding hazardous atmosphere. Suitable for use in Zone 1 areas.

Dual Certification for IIB Gas and Dust (IIB + Dust):
Certified for both IIB gases (such as propane and ethylene) and combustible dust environments, offering broad applicability across multiple hazardous conditions.

Precision-Machined Flameproof Joints:
Incorporates accurately machined flat and spigot (flamepath) joint structures. Explosion-proof gaps strictly comply with standards, providing enhanced safety margins and reliability.
02

Robust Protection and Durability

IP66 Protection Rating:
Ensures stable performance in outdoor, humid, and dusty environments. Provides excellent resistance to water ingress, dust, and aging.

Optional Materials:
Available in aluminum alloy, 304 stainless steel, or 316 stainless steel. Supports WF1/WF2 anti-corrosion ratings, offering strong resistance to acids, alkalis, and salt spray.

Reliable Sealing Structure:
Features silicone rubber sealing combined with a labyrinth (flamepath) structure, ensuring dependable sealing performance. Resistant to impact and vibration, with a long service life.
03

Excellent Electrical Performance

High Current Capacity:
Rated for currents up to ≤600A, meeting the requirements of industrial power distribution circuits.

Dedicated High-Current Terminals:
Designed with low contact resistance and minimal heat generation, ensuring secure connections and facilitating easy maintenance.

Compliant Clearance and Creepage Distances:
Electrical clearances and creepage distances comply with relevant standards, providing strong insulation performance and effectively preventing risks of short circuits and leakage.
04

Convenient Installation and Operation

Modular Design:
The number of circuits, cable entries/exits, and mounting methods (wall-mounted or floor-mounted) can be customized to meet project requirements.

Cable Entry Threads:
Available in G1/2 to G2 threads (metric, BSP, or NPT), compatible with explosion-proof cable glands.

Easy Access and Efficient Wiring:
Quick-opening cover and well-organized internal layout ensure efficient on-site installation, maintenance, and future expansion.
05

High Customization and Versatility

Flexible Customization Options:
Supports non-standard customization of dimensions, circuit configurations, terminals, materials, and protection ratings to meet specific project requirements.

Broad Wiring Compatibility:
Compatible with steel conduit, cables, and explosion-proof flexible conduits, making it adaptable to various industrial power distribution systems.

Multi-Functional Integration:
Can be equipped with additional components such as circuit breakers, surge protection devices, instruments, and switches to meet diverse functional requirements.
06

Brand and Quality Assurance

Trusted Manufacturer:
LD Electric is a high-tech enterprise with complete explosion-proof certifications and ISO quality management system certification.

Strict Quality Control:
Full-process quality inspection ensures suitability for demanding applications such as chemical plants, oil depots, and military-grade environments.

Proven Project Experience:
Extensive experience in flameproof and explosion-proof projects ensures reliable performance, long-term stability, and high safety standards.

Normal Operating Conditions

Hazardous Area Classification: Suitable for Zone 1 and Zone 2 explosive gas atmospheres of Group IIA and IIB, and/or Zone 20, Zone 21, and Zone 22 combustible dust environments.

Temperature Class: T1 to T4 (up to T6 available upon request).

Installation Environment: Suitable for both indoor and outdoor use (IP66).

Applications: Widely used in hazardous locations such as chemical plants, refineries, oil and gas extraction sites, offshore oil platforms, oil tankers, and military industries for the connection and branching of lighting, power, and control circuits.

Ingredients & Materials

Material: Carbon steel or stainless steel.

Technical Parameter

Enclosure Protection Rating: IP66.

Rated Voltage: ≤ 35 kV.

Ambient Temperature and Explosion-Proof Marking: When the ambient temperature range is -30°C < Ta < +40°C, the explosion-proof marking is Ex db IIB T6 Gb. When the ambient temperature range is -20°C < Ta < +40°C, the explosion-proof marking is Ex db IIB T6 Gb / Ex tb IIIC T80°C Db.

Enclosure Overall Dimensions and Related Parameters

Design No.	Enclosure Overall Dimensions （mm）	Rated voltage（kV）
Ⅰ	1400×1350×885	≤35
Ⅱ	1200×1400×700	≤20
Ⅲ	1050×1400×700	≤15
Ⅳ	950×1350×650	≤10
Ⅴ	850×1300×650	≤6
Ⅵ	750×1300×650	≤3

LD-FBJX Series Explosion-Proof Junction Box (Ex d IIB / DIP) – Flameproof Type