The 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. It is also available with a Harsh Environment Conformal Coating option.
Features & Benefits
Save on installation cost - Compact design
Enhanced protection - incorporates thermal models
Setting flexibility - Multiple setpoint groups
Simplify testing - Built in simulation features
Asset Monitoring - Temperature monitoring via optional
RTD inputs
Access information - via Modbus RTU™
Follow technology evolution - Flash memory for product field upgrade
Applications
Complete protection of small to medium sized motors
Pumps, conveyors, compressors, fans, sawmills, mines
Protection & Control
Thermal Overload (15 selectable curves) - Trip and alarm, immediate current overload alarm
Phase short circuit
Mechanical jam
Thermal memory lockout
Single-Phasing / Current unbalance
Ground fault - trip and alarm
Overtemperature: via thermistor or optional RTD inputs
Undercurrent
Breaker Failure
Trip/alarm/auxiliary/service outputs
Multi-speed motor protection
Motor start supervision