Space (Standstill) heaters
Electric motors that are not continuously running (S1 duty), are usually provided with a standstill or space heater coils (SHC). The heaters switch on when the electric motor is not running and ensure that a constant temperature inside the motor housing is maintained. Sudden differences in temperature inside the electric motors cause water condensation, which is harmful and can shorten the service life of electric motors. The heaters keep constant temperature in motors after they have been switched off and prevent forming condensation.