Motor protection

Motor protection is the collective term used for all measures designed to protect electric motors and includes overload, short circuit, undervoltage and phase failure protection.

Motor protection protects electric motors from thermal overloading due to mechanical overloading or failure of individual phases.

An electric motor can be protected from an overload by monitoring its current requirement via motor protection switches or motor protection relays and by monitoring the temperature in the motor windings via bimetal switches and PTC resistors.