Description
4.5 Area of application
SIRIUS 3RN2 thermistor motor protection relay
26 Manual, 10/2016, A5E34244868002A/RS-AA/001
Direct motor protection through temperature monitoring of the motor winding offers 100 %
motor protection even under the most difficult ambient conditions, without the need to make
adjustments on the SIRIUS thermistor motor protection relay. Versions with hard gold-plated
contacts additionally ensure a switching reliability that is higher than that of an electronic
control.
Direct motor protection:
● At increased ambient temperatures
● When switching frequency is too high
● When starting and braking operations are too long
● Used together with frequency converters (low speeds)
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