Motor Protection (MPD) is a device or group of devices that serves to govern in some predetermined manner the performance of an electric motor. A motor controller might include a manual or automatic means for starting and stopping the motor, selecting forward or reverse rotation, selecting and regulating the speed, regulating or limiting the torque, and protecting against overloads and faults.
Single phase preventer’s (SPP) are used for automatic control of three phase motor starters. These are capable of restarting the motor automatically once the power in all the three phases resumes back in healthy condition. SPP equipped with Timer System operates the motor starter with a startup time delay of few seconds which prevents sparking at contact points of contactors and increase the life of motor starter.