VISHAY SFERNICE RT, RTE Wirewound Rheostats and Potentiometers Specifications Data Sheet User Manual
Summary
Explore Vishay Sfernice wirewound rheostats and potentiometers, designed for heavy-duty variable resistance control applications across industrial environments. The product line includes high-wattage RT vitreous series resistors and precision RTE lacquered units for high ohmic values. This manual provides comprehensive technical documentation, including detailed power rating charts, temperature rise curves, various winding configurations, and ordering guides to ensure optimal performance selection. Ideal for engineers and technicians requiring reliable resistive solutions capable of handling repeated overloads and extreme operating conditions.
Page 1 Text Content
RT, RTE
IN TO IN
Vishay Sfernice
Wirewound Rheostats and Potentiometers
Characteristics
RHEOSTAT MODE
FEATURES • 12W to 500W at 25°C • CCTU 05-03B
The performance of RT-RTE rheostats exceeds the require- ments of specifi cation CCTU 05-03B. They have been designed for heavy duty applications such as repeated overloads, transients, shock and vibration con- ditions. RT VITREOUS SERIES Six sizes are available capable of dissipating 12, 25, 55, 100, 250 or 500 watts at 25°C. The resistive wire is protected by a proprietary Vishay Sfernice enamel fi red at high temperature and free from any compound that could cause corrosion of the wire. The maximum operating temperature of the RT series is 320°C.
POTENTIOMETER MODE
RTE LACQUERED SERIES The RTE series covers high ohmic values but with a maximum operating temperature of 220°C. The RTE versions have reduced power ratings except the RTE 12 series.
GANGED UNITS Ganged units are available with different combinations of power and ohmic values (see data-sheet).
GRADED WINDINGS
I max. > 2
These are recommended when the ratio is I min.
MAXIMUM OVERLOAD
In rheostat use, the winding current decreases in relation to the number of turns being used.
When part of the winding is used the current can be increased 1.16 in accordance with the graph on the left. Substantially heavier overloads can be applied in short
impulses and we would be pleased to advise on this type of application, on receipt of the following information :
– proposed rheostat usage
– current level – operating cycles specifying duration of overload “ON”,
”OFF” periods.
% WINDING IN SERVICE
www.vishay.com For technical questions, contact [email protected] Document Number: 50024
Revision 30-Jan-02
Page Summary Contents For VISHAY SFERNICE RT, RTE Wirewound Rheostats and Potentiometers Specifications Data Sheet User Manual
Manual Details
| Brand | Vishay |
|---|---|
| Pages | 4 |
| File Size | 144.91 KB |
| Published | June 15, 2026 |
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Frequently Asked Questions
What are the maximum operating temperature limits for the RT and RTE series?
The RT series has a maximum operating temperature of 320°C, while the RTE series is limited to 220°C.
How can I order ganged units or specific configurations?
Ganged units are available with various combinations; consult the datasheet or contact Vishay Sfernice for details.
Are these rheostats suitable for harsh industrial environments?
Yes, they are designed for heavy-duty applications such as repeated overloads, transients, shock, and vibration conditions.
Is there a difference in winding current usage?
In rheostat use, the winding current decreases as more turns are used. However, the current can be increased if only part of the winding is utilized.