GE Multilin UR9EV Digital I/O Expansion Module

The GE Multilin UR9EV is a hot‑swappable plug‑in digital I/O expansion module for GE Multilin UR‑series universal protection relays. It collects contact status signals from circuit breakers, disconnectors and field auxiliary equipment, and outputs relay dry‑contact control signals for trip, alarm and interlock logic, expanding input‑output channel capacity for substation protection‑control applications.

This module directly plugs into the UR relay chassis backplane bus, provides galvanic isolation for field signals and supports per‑channel hardware self‑diagnosis with LED status indicators. Original production has been discontinued. It is widely supplied as aftermarket spare parts for utility substation, petrochemical power‑room protection cabinet maintenance and automation‑system retrofitting projects.

Main Specifications

1. Brand:GE; Model:UR9EV; Type:Multilin UR‑Series Digital I/O Expansion Module
2. I/O Configuration:Multiple galvanic‑isolated digital inputs and Form‑C relay output contacts
3. Bus Interface:Direct plug‑in connection to UR‑series relay internal backplane bus
4. Isolation Performance:High‑voltage galvanic isolation between field wiring and relay internal circuits
5. Diagnostic Feature:Per‑channel self‑diagnosis, LED indicators for input‑output channel working status
6. Operating Temperature:‑40℃ ~ +85℃, suitable for harsh substation cabinet environments
7. Supply Status:Original production discontinued, available as tested surplus or refurbished spare parts

Core Functions

1. Acquire contact status signals from circuit breakers, disconnectors and field auxiliary devices and transmit status data to UR main relay CPU.
2. Receive logic commands from main protection relay and output Form‑C dry‑contact signals for tripping, alarm annunciation and external interlock control.
3. Deliver galvanic isolation to suppress surge and electromagnetic interference from field circuits and protect main relay internal hardware.
4. Support hot‑swap installation within compatible UR chassis to shorten equipment downtime during module maintenance and replacement.
5. Detect channel hardware faults, upload diagnostic information to main relay and display channel operating states via on‑board LED indicators.
6. Serve as critical signal‑expansion hardware for GE Multilin UR‑series protection and control relays inside substation automation cabinets.

Application Scenarios

1. Power‑utility substations, petrochemical plants, metallurgical enterprises and other power‑system automation sites equipped with UR‑series protection relays.
2. Spare I/O expansion module replacement and routine maintenance of existing GE Multilin UR‑family protection‑control cabinets.
3. Technical renovation and I/O channel capacity upgrade of aging substation protection‑control automation systems.
4. On‑site troubleshooting and replacement of faulty expansion modules on continuously operating power‑supply protection units.
5. Spare‑parts stocking for system integrators and power‑system professional maintenance contractors.
6. Global aftermarket spare supply for technicians maintaining obsolete GE Multilin UR‑series legacy protection hardware.

FAQ

1. Q:Can UR9EV work as a standalone device?
   A:It is an expansion accessory module, must be installed inside matched Multilin UR relay chassis and cannot operate independently.
2. Q:What failures will occur when UR9EV module is damaged?
   A:Loss of corresponding input‑output channels, missing breaker status feedback and failure to execute interlock or trip commands may appear.

3. Q:What software is used for UR9EV configuration?
   A:Configuration and diagnostic operations are completed together with host relay through GE EnerVista UR setup software.