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GE 239 Motor Protection Relay
GE 239 Motor Protection Relay
DESCRIPTION
The GE Multilin 239 relay is designed to fully protect three phase AC motors against conditions which can cause damage. In addition to motor protection, the relay has features that can protect associated mechanical equipment, give an alarm before damage results from a process malfunction, diagnose problems after a fault and allow verification of correct relay operation during routine maintenance. Using the ModBus serial communications interface, motor starters throughout a plant can be connected to a central control/monitoring system for continuous monitoring and fast fault diagnosis of a complete process.
PROTECTION
• Overload (15 selectable curves)
• Short circuit
• Locked rotor
• Stall / mechanical jam
• Repeated starts (Mod 505)
• Single phase / unbalance
• Ground fault
• Overtemperature (Thermistor & 3 RTDs)
• Undercurrent
• Overload warning
• Breaker failure
FEATURES
• Status/current/temperature display
• Fault diagnosis
• Trip record
• Memory lockout
• Thermal capacity / load% / RTD analog output
• Trip / alarm / auxiliary / service relay outputs
• Motor Running Hours
• Motor maximum current on last start
• Simulation mode for field testing
• Clear LCD display
• RS485 Modbus communications interface
• AC/DC control power
• Compact size, fits most starters
• Update options and/or MODs in field
• CSA/UL Approved
• Conformal coating for harsh environment
Typical Applications
Versatile features and simple programming controls make the 239 an ideal choice for motor and equipment protection in a wide range of applications. In addition to basic electrical protection for motors, the 239 can protect against common faults due to process problems, such as:
1. Mechanical protection of pumps using the undercurrent feature to detect loss of suction or a closed discharge valve.
2. Personnel safety and mechanical protection of fans against loss of air flow in mines or flow in steam generating boilers using the undercurrent feature.
3. Electrical protection of compressor motors from excessive run up time caused by an open outlet using the start timer.
4. Mechanical protection of gears, pumps, fans, saw mill cutters, and compressors against mechanical jam using the mechanical jam trip feature.
5. Safety to personnel from shock hazard using the ground fault feature to detect winding shorts or leakage currents from moisture in mines.
6. Protection of motors and equipment from operator abuse using the thermal memory lockout
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