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Description
Thermal motor protection prevents the motor from overheating and consequently from
being damaged. The two higher thermal classes 155 (F) and 180 (H) are monitored. The
TH has a triplet design, which means that each motor phase contains a thermostat NC
contact. These are connected in series.
The TH consists of a bimetallic switch that trips when a certain temperature is reached
and opens the contact. Connection to a controller or feedback system ensures that the
motor will be switched off. When the motor cools down, it does not immediately switch
back to the rated switching temperature (NST) but only after approx. 40 K below the
rated switching temperature (reset temperature RST).
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