A motor protection relay is an electrical safety device. That monitors a motor’s operational conditions and disconnects power if it detects dangerous conditions. Like overloads, short circuits, or over-temperature, preventing motor damage and system downtime. These smart, microcontroller-based relays continuously observe current, voltage, and temperature to identify faults. Such as phase failure, ground faults, and locked rotors, ensuring the safe and efficient operation of electric motors in various industrial applications.
The motor protection relay is connected to the motor’s control circuit and the power supply.
It constantly monitors electrical parameters like current, voltage, and sometimes temperature.
If any parameter exceeds pre-set thresholds for too long, the relay identifies it as a dangerous condition.
Monitors current to detect when a motor draws too much power, which can cause overheating and damage.
Identifies sudden, excessive current flow or contact between a winding and the ground, which can lead to catastrophic failure.
Detects if one or more phases of the power supply are lost or if there’s an imbalance in the phases, which can damage the motor.
Monitors the motor’s supply voltage to ensure it stays within a safe operating range.