Resistors design

Spiral resistors (RT)

Rezystory serii RT

RT Spiral Resistors are the old and proven solution for applications with continuous currents starting at 30A.


RT Spiral Resistors consist of a spirally wound resistance band installed on an insulated core. The component packages are mounted on a common frame to form ready resistors.

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Dimensions of RT resistors

Depending on resistor power (available on request)

Operating conditions of RT Spiral Resistors 

  • operating conditions Continuous, cycle or pulse operation Indoors or outdoors
  • operation in atmospheres being free from gases, explosive mixtures and corrosive vapours
  • relative humidity: up to 95% at +22 C (293 K)
  • mounting height: maximum 1000m above sea level

Compliance with standards

  • PN-EN 60947-1: Low-voltage switchgear and control gear, Part 1: General rules
  • PN-EN 60071-1: Insulation co-ordination, Part 1: Definitions, principles and rules
  • PN-EN 60529: Degrees of protection provided by enclosures (IP Code)

Parameters / operating conditions of RT Spiral Resistors

Continuous power range:   from 2kW up to any power depending on the application requirements.
Continuous current range:  from 25A up to any current value by parallel connection
Resistance range: Depending on power and operating current
Resistance tolerance:  ±10%, lower on request
Operating voltage: Up to 1000V They can also be used for medium-voltage applications
Insulation withstand voltage: 3500VAC / 1min. (standard design)
Temp. of resistance steel for continuous operation:  350°C ±50°C
Min. / max. ambient temperature:  -40°C / 50°C
Installation conditions: Indoors or outdoors (for built-in resistors)
Protection class:  IP00 – IP23

SIMPAX sp. z o.o.

Grabonóg 76
63-820 Piaski
(k. Gostynia)

+48 65 571 20 60

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