Description
4.2 Device description
SIRIUS 3RN2 thermistor motor protection relay
22 Manual, 10/2016, A5E34244868002A/RS-AA/001
Type A PTC temperature sensor
If a type A temperature sensor is connected to a thermistor motor protection relay,
compliance with the operating temperatures is assured (on pick-up and reset) according to
IEC 60947-8.
The characteristic curves of the Type A temperature sensors are described in the standards
IEC 60947-8, EN 44081, and EN 44082.
Figure 4-1 Typical characteristic curve of a type A sensor (logarithmic scale)
Depending on the number of sensors connected in series, the following tripping and restart
temperatures will result based on the TNF (rated response temperature of the sensor):
(The specified temperatures are limit values.)
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