Terminal boxes

Terminal boxes

Backer always stocks a wide range of terminal boxes for use with standard immersion heaters and customer designed constructions. The terminal boxes are designed for mounting on immersion heaters with R 1 ¼" - R2" screw-plugs. The terminal boxes can be turned to any suitable position with respect to the cable inlet. The covers are made of carbonate plastic or die-cast aluminum. The terminal boxes are designed to meet the requirements for protection class IP55 or better.


The terminal boxes are available in many different models and can be equipped to meet most requirements regarding thermostats and thermal cut-offs. The product range, also includes a terminal box in carbonate plastic for use with our standard defrosting elements. This terminal box meet the requirements for protection class IP65.

Technical data




See product information below


For installation on our standard immersion heaters with R32/40 and R50 threads; the boxes are assembled with the enclosed screws.


Without thermostat and thermal cut-off
With thermostat 1-, 2-, or 3-pole
With thermal cut-off 1- or 3-pole
With thermostat and thermal cut-off

Protection class

IP54, IP65

Example applications

  • Industrial baths
  • Immersion heater with box
  • Domestic water heater
Immersion heater with box

Product examples

BACKER AB · FABRIKSGATAN 11 · SE-282 71 SÖSDALA · TEL: +46 (0)451-66100 · [email protected] · Corp. reg: 5560530569

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