LD-FBJX Series Intrinsically Safe Explosion-Proof Junction Box (Ex ia IIC)

Product Features

Ambient Conditions and Hazardous Area Classification: With an ambient temperature of ≥ -5°C, the LD-FBJX series explosion-proof junction box is suitable for Zone 1 and Zone 2 explosive gas atmospheres of Group IIA and IIB, with temperature classes T1 to T6, or Zone 21 and Zone 22 combustible dust environments.

Standards Compliance: The junction box is designed and manufactured in strict accordance with GB/T 3836.1 “Explosive Atmospheres – Part 1: Equipment – General Requirements” and GB/T 3836.2 “Explosive Atmospheres – Part 2: Equipment Protection by Flameproof Enclosure ‘d’”. It also references GB/T 3836.31 “Explosive Atmospheres – Part 31: Equipment Dust Ignition Protection by Enclosure ‘t’”.

Applications: Widely used in industries such as petroleum, chemical processing, terminals, ports, mining, aerospace, aviation, military, and grain processing.

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

Surface Treatment: Coating (painting) or chemical surface treatment.

Cable Entry/Exit Method: Equipped with IP66-rated cable glands.

Cable Entry/Exit Configuration: The direction and specifications of cable entries/exits can be customized according to user requirements.

Product Advantages

• 01

  Intrinsic Safety – Maximum Explosion Protection

  Ex ia Intrinsic Safety (Highest Level):
  Ensures no risk of ignition under normal operation and even with two independent fault conditions. Suitable for use in Zone 1 hazardous areas, representing the highest level of intrinsic safety protection.

   

  IIC Certification – Highest Gas Group:
  Suitable for the most hazardous gases such as hydrogen and acetylene, providing an exceptionally high safety margin.

   

  Intrinsic Safety Principle:
  Explosion protection is achieved by limiting electrical energy (voltage, current, and overall energy), eliminating sparks and high temperatures. This makes it especially suitable for instrumentation and signal systems.

• 02

  Protection, Corrosion Resistance, and Durability

  IP66 Protection Rating:
  Ensures stable performance in outdoor, humid, and dusty environments, with 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, providing strong resistance to acids, alkalis, and salt spray.

   

  Reliable Sealing Structure:
  Combines silicone rubber sealing with a labyrinth structure, ensuring dependable sealing performance and long service life.

• 03

  Dedicated Design for Intrinsically Safe Circuits

  Intrinsically Safe Terminals:
  Designed specifically for Ex ia applications, ensuring reliable isolation, prevention of miswiring, and clear, organized cabling.

   

  Strict Intrinsic Safety Parameters:
  Electrical clearances, creepage distances, capacitance, and inductance are fully compliant with intrinsic safety requirements, effectively eliminating potential hazards.

   

  System Compatibility:
  Supports integration with intrinsically safe associated apparatus (such as safety barriers and isolators), ensuring strong system compatibility.

• 04

  Convenient Installation and Maintenance

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

   

  Cable Entry Threads:
  Available in G1/2 to G2 (metric, BSP, or NPT), equipped with intrinsically safe cable glands.

   

  Easy Access and Wiring:
  Quick-opening cover and simplified wiring layout ensure high efficiency for on-site 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 intrinsically safe cables and steel conduit wiring, making it suitable for various industrial automation systems.

   

  Enhanced Functional Options:
  Can be equipped with additional features such as surge protection, grounding, and labeling to meet complex on-site requirements.

• 06

  Brand and Quality Assurance

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

   

  Rigorous Quality Control:
  Full-process quality inspection ensures suitability for demanding environments such as chemical, gas, and military applications.

   

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

Normal Operating Conditions

Ingredients & Materials

Technical Parameter

Enclosure Overall Dimensions and Related Parameters