Due to their characteristics, the thermistor motor protection relays can also be used with PTC temperature sensors of other manufacturers which comply with DIN 44 081 and DIN 44 082 6 sensors. A 14 V varistor can be connected in parallel to protect the sensors from overvoltage. Pole-changing motors with two windings, however, require The sensors are suitable for embedding in motor windings with rated operating voltages of up to 600 V AC. For pole-changing motors with one winding (Dahlander connection), 3 sensors are also sufficient. For instance, in case of three-phase squirrel cage motors, three sensors are embedded in the stator windings. One temperature sensor must be embedded in each phase winding.
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