Klockner Moeller Electric Parts from KlocknerMoeller.net
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Call Toll Free!
1-877-595-9616
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Largest Authorized Stocking USA Distributor
Representing
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All about Motors
Motor protection |
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| Thermistor relay for machine
protection relays |
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Thermistor overload relays are used in conjunction with
temperature-dependent semiconductor resistors (thermistors) for
monitoring the temperature of motors, transformers, heaters, gases,
oils, bearings etc.
Depending on the application, thermistors have positive (PTC thermistors)
or negative (NTC thermistors) temperature coefficients. With PTC
thermistors the resistance at low temperature is small. From a certain
temperature it rises steeply. On the other hand, NTC thermistors have a
falling resistance-temperature characteristic, which does not exhibit
the pronounced change behavior of the PTC thermistor characteristic.
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