ABB REM620 Motor Protection & Control Relay – Key Functions
1. Comprehensive Motor Protection
Thermal Overload Protection (49)
Dual thermal models for motor and cable protection with adjustable cooling time constants
Supports RTD (Pt100/PTC) inputs for direct winding/bearing temperature monitoring
Stall/Locked Rotor Protection (14)
Detects motor stalling during startup or operation with configurable timers
Phase Unbalance & Negative Sequence (46)
Protects against phase asymmetry (≥5% imbalance)
2. Electrical Fault Protection
Short-Circuit Protection (50/51)
Instantaneous and time-delayed overcurrent protection
Earth Fault Protection (50N/51N/50G/51G)
Residual current detection via core balance or neutral CTs
3. Advanced Control & Automation
Start Management:
Anti-jogging logic to prevent sequential restarts
Starts-per-hour counter with thermal memory
Underload (37) & Underpower Protection
Detects loss-of-load conditions (e.g., pump run-dry)
4. Mechanical & Environmental
Modular Design:
Plug-in I/O modules (e.g., NAMBBABA33E5BNN1XF variant) for flexible expansion
Robust Construction:
Operates in -40°C to +70°C environments (conformal coating option)
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