ABB REM610 Motor Protection Relay – Key Functions
1. Core Motor Protection
Thermal Overload Protection (49)
Motor thermal model with cooling time constants
RTD (PTC/NTC) input for direct winding temperature monitoring
Stall Protection (14)
Locked rotor detection with adjustable timer
Short-Circuit Protection (50/51)
Instantaneous & time-delayed overcurrent
2. Advanced Fault Detection
Unbalance & Negative Sequence (46)
Phase asymmetry protection (≥5% imbalance)
Earth Fault Protection (50N/51N)
Residual current detection (core balance CT or neutral CT)
3. Start & Operational Control
Start Supervision:
Sequential restart blocking (anti-jogging)
Starts-per-hour counter
Undercurrent (37) & Underpower
Loss-of-load detection for pumps/fans
4. Mechanical Design
Compact Form Factor:
1/2 19″ rack width (4U height)
Robust Construction:
-25°C to +55°C operating range
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