SPACE HEATERS FOR MOTORS

These are provided over the windings of the motor .The main function of heaters, is to heat the windings when motor is in idle condition or kept in storage , in order to prevent moisture or dew settling over the windings and thereby reducing the insulation resistance CAUTION-Supply to the heaters must be switched off before switching on the motor. The motors are provided with space heaters of ratings 25w, 40w, 50w, or 60w 240 V single phase depending on the frame size. Like thermistors the space heater leads are also brought in the main terminal box or in a separate auxiliary terminal box.