EPHYMESS PTC thermistors are predominantly motor protection PTC thermistors as per DIN 44081/44082 that are used in the winding of electric motors, generators and transformers. Combining a motor protection PTC thermistor with a trigger device provides am effective, good-value and fast-reacting solution for protecting electrical machines against overheating. They are available as single, double or triplet PTC thermistors. PTCs with different NATs can be connected in series in a measuring circuit to monitor different temperature ranges of a machine. When two measuring circuits are used, for example, a combination of pre-warning and shutdown is possible.