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Nelson™ Heat Trace EXCJB21-M25 Terminal Enclosure
Nelson™ Heat Trace™ EXCJB21-M25 Terminal Enclosure
Nelson™ Heat Trace EXCJB21-M25 Series carbon loaded glass reinforced polyester enclosure is suitable for use in Zone 1 and Zone 2 hazardous areas, offering protection to IP67.
It is designed for use as a power connection, powered splice or standard splice, the EXCJB21 can be either pipe or wall mounted.
Nelson™ Heat Trace EXCJB21-M25 Terminal Enclosure


Certifications and Compliances
ATEX Certified: Hazardous (Classified) Locations
Ex II 2 GD; EEx e II T6
122 mm x 120 mm x 90 mm (4.8 in x 4.7 in x 3.5 in)
3 x M25, 1 x M25 blanking plugs
Minimum Ambient Temperature
-40 °C (+40 °F)
Klemsan AVK 6 Series; 2 Ex terminal block, 1 Ex ground terminal block
Maximum Conductor Size
10 mm² solid, 6 mm² stranded (0.016 in² solid, 0.009 in² stranded)
Maximum Operating Voltage
630 Vac
Maximum Current Rating
41 A
Heating cable connection kits, insulation entry kits, heater cable gland, power cable gland and support brackets are available. See catalog pages for details


  • Entry pattern: (1) M25 threaded opening on side and (2) M25 threaded openings on bottom with (1) blanking plug
  • Factory installed increased safety "e" terminals, (2) power and (1) ground to cover standard connection configurations
  • Connection kits, insulation entry kits and mounting brackets are ordered separately