German KRIWAN INT389R compressor motor protector, according to the DIN 44081/082 standard, do more in the measurement circuit input serial connection of 9 PTC type temperature sensor (with different rated response temperature). Once the temperature of a monitoring area exceeds the rated temperature of the corresponding PTC sensor, the THP motor protection module will be activated to turn on the relay. When the protector is activated, a timer is started; only after 30 minutes, when the PTC signal (the resistance of the sensor) falls back below the reset threshold, the protection mechanism can be removed.
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