Relay Features - GE 239 Instruction Manual

GE Consumer & Industrial
Multilin
239
Motor Protection Relay
CAUSE OF LAST TRIP:
MECHANICAL JAM
TRIP AUXILIARY PICKUP
ALARM SERVICE COMMUNICATE
ACTUAL
MESSAGE
SETPOINT
STORE
VALUE
RESET
1.1 Overview
1.1.1

239 Relay Features

239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
239 Motor Protection Relay
Chapter 1: Overview
Overview
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.
One relay is required per motor. Since phase current is monitored through current
transformers, motors of any line voltage can be protected. The relay is used as a pilot
device to cause a contactor or breaker to open under fault conditions; that is, it does not
carry the primary motor current. When the over temperature option is ordered, up to 3
1–1