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