GE SR489-P5-LO-A20-E Intelligent Motor Protector

Description

The SR489-P5-LO-A20-E intelligent motor protector from General Electric (GE) is a multifunctional protection and control device designed specifically for industrial motors. It integrates functions such as overload protection, short circuit protection, and ground fault detection, and is suitable for motor protection of key equipment such as pumps, fans, and compressors.
Core functions and technical parameters
Protection function
Overload protection: Based on the thermal model (IEC 60947-4-1), the trip curve supports Class 10/20/30.
Short circuit protection: instantaneous tripping (short delay<100ms).
Phase loss/imbalance protection: detects voltage or current imbalance (sensitivity adjustable).
Locked rotor protection: Monitor the locked rotor current during motor start-up.
Ground fault protection: detects ground leakage current (requires zero sequence CT configuration).
Electrical parameters
Rated current: 20A (represented by A20 in the model).
Voltage range: 208-600V AC (3-phase), compatible with 50/60Hz.
Accuracy: Current ± 1%, voltage ± 1.5%.
Communication interface:
2 x Modbus RTU (RS-485, default address 1).
Optional EtherNet/IP and Profinet (module required).
mechanical properties
Installation method: rail installation (compliant with DIN EN 50022).
Protection level: IP20 (indoor use), optional IP54 protective cover.
Dimensions: Approximately 72mm (width) x 90mm (height) x 65mm (depth).
Typical application scenarios
Pump and fan control: protect the motor from overload, dry operation, or blockage damage.
Compressor system: Monitor extended parameters such as bearing temperature and vibration (sensors need to be selected).
HVAC system: integrated into building automation, supporting remote status monitoring.
Water treatment equipment: protect the safe operation of motors in humid or corrosive environments.
User core focus points
Configuration and Debugging
Set local parameters (such as trip threshold and delay time) through the LCD display screen and knob.
Support remote configuration using GE Multilin Tool software (requires USB or communication interface).
Communication integration
Compatible with mainstream SCADA systems such as Wonderware and WinCC, supporting Modbus TCP/IP gateway extension.
Optional Ethernet/IP module, directly connected to Rockwell automation network.
Scalability
Support thermal relay replacement: directly replace traditional thermal relays without the need for additional contactors.
Optional I/O expansion module: increases digital input/output for alarm or control signals.
compliance
Compliant with UL 508, IEC 60947-2, ATEX Zone 2 and other standards (specific configuration required).
Provide Event Recording (SOE) functionality to meet industrial audit requirements.
Alternative and upgrade suggestions
Discontinued model replacement: If an upgrade is needed, the GE SR489-P6 series (supporting higher precision ground fault detection) can be considered.
Function extension: Add SR489-COM-EIP module to achieve EtherNet/IP communication.
Cloud monitoring: Integrated through GE Digital platform to achieve remote warning and data analysis.