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High voltage junction box zone 1, 21

  • Stainless steel
  • Zone 1, 21
  • High voltage
  • Up to 45 kV in Zone 1
  • DTS-01 anti-flood tested case
  • 40 kA rated error for 1 second
  • Available with an additional fiber optic ender compartment

The 4TJB junction case is designed to house high voltage connections in Atex areas. It can connect power or multi-purpose cables up to 45 kV. The 4TJB can accept up to three single-phase connections (one driver per phase) in a lower input configuration or through a box. This sturdy SX stainless steel junction box has a proven track play in the field as it has been tested in deluge DTS-01 and been rated at 40 kA for a second.


Case type: high voltage
Penetration protection: IP66 according to EN60529, DTS-01
Shock resistance: > 7Nm (tested above 10 Nm)
Materials: 316L stainless steel 2mm case (EN 1.4404) with orbital finish, silicone seal and captive 316 stainless steel fasteners, 3 mm 316L stainless steel cable plates (EN 1.4404)
Maximum terminations: Up to three connections per phase
Defect assessment: 40kA for a second
Number of sling plates: Depending on the configuration
Crimps: 6 mm2 to 1000 mm2
Grounding: By studs on the case, door and cable plates
Editing: Via sturdy external straps 3 mm thick
Classification of the area: Zone 1 and 21, gas and dust
Device coding:
– High voltage box: Ex sb IIC T4 Gb or Ex sb IIB T4 Gb
– Optical signal box: Ex -op is IIC T4 Gb or Ex -op is IIB T4 Gb and/or Ex op is IIIC T70 – C / T80 – C Db

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