GE Multilin UR Series Modules: UR9GH UR 9GH CPU Module —

Technical Dossier

Product Details And Specifications

GE Multilin UR Series: Comprehensive Module Range and Technical Overview

The GE Multilin Universal Relay (UR) Series represents one of the most widely deployed protection and control platforms in global heavy industry. Installed across high-voltage substations, chemical processing plants, nuclear generating stations, offshore oil platforms, and petroleum refineries, the UR platform provides integrated protection, control, metering, and communications in a single modular chassis. Its architecture supports IEC 61850, DNP3, Modbus, and GOOSE messaging, making it a backbone component in both legacy SCADA environments and modern digital substation deployments. The UR9GH (UR 9GH) is a CPU/communications module within this platform, responsible for coordinating inter-module data exchange across the UR backplane and managing primary relay logic execution.

The Evolution of UR Series Architecture

The UR platform was introduced by GE Multilin in the late 1990s as a successor to discrete electromechanical and early digital relay designs. The first-generation UR chassis used a parallel backplane with proprietary inter-module communication. By the mid-2000s, GE introduced the UR 7.x and 8.x firmware generations, adding IEC 61850 Edition 1 compliance and expanded I/O slot counts. The UR 9.x generation — to which the UR9GH belongs — introduced enhanced CPU processing speed, IEC 61850 Edition 2 support, IEEE 1588 precision time protocol (PTP) synchronization, and expanded cybersecurity features aligned with NERC CIP standards.

Compatibility across UR generations is slot-dependent: UR 7.x and 8.x modules are generally not interchangeable with UR 9.x CPU and communications modules due to backplane protocol differences. Field engineers replacing a UR9GH must verify chassis generation, firmware revision, and slot assignment before substitution. GE Multilin has issued multiple product change notices (PCNs) affecting component-level availability for UR 9.x modules, and several sub-variants have transitioned to limited-availability or end-of-active-production status.

UR Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the GE Multilin UR platform. Each entry reflects a distinct hardware function within the UR chassis architecture.

CPU & Communications Modules

• UR9GH: 9th-gen CPU module with dual Ethernet, IEC 61850 Ed.2, IEEE 1588 PTP support
• UR9FH: CPU module variant with single fiber-optic Ethernet port configuration
• UR9EH: CPU module with RS-485 serial and single copper Ethernet interface
• UR8GH: 8th-gen CPU module, IEC 61850 Ed.1, dual Ethernet, predecessor to UR9GH
• UR8FH: 8th-gen CPU with fiber Ethernet, compatible with UR 8.x chassis backplane
• UR7GH: 7th-gen CPU module, DNP3/Modbus primary, limited IEC 61850 support
• URTXM: Communications module, RS-232/RS-485 multi-protocol serial interface card
• URCM: Inter-chassis communications module for UR multi-chassis configurations

Digital Input (DI) Modules

• UR6DH: 24-channel digital input module, 24–250 VDC/VAC wet contact sensing
• UR6DL: 24-channel digital input module, low-voltage 5–24 VDC logic input variant
• UR6DJ: 16-channel digital input with enhanced surge withstand per IEC 61000-4-5

Digital Output (DO) / Relay Output Modules

• UR6KH: 16-channel form-A relay output module, 30 VDC / 250 VAC, 8A continuous
• UR6KF: 8-channel form-C relay output module with high-speed trip output capability
• UR6KG: Mixed output module, 8 form-A + 4 form-C relay contacts, general protection use

Analog Input (AI) Modules

• UR6AH: 8-channel analog input module, CT/VT inputs, 1A/5A CT and 120/240 VAC VT rated
• UR6AF: 4-channel analog input, transducer-type 4–20 mA / 0–10 V process input variant

Power Supply Modules

• URPSH: UR chassis power supply, 125/250 VDC or 120/240 VAC input, redundancy-capable
• URPSL: Low-voltage power supply variant, 24–48 VDC station battery input

Sourcing Hard-to-Find & Obsolete UR Series Parts

GE Multilin has progressively transitioned UR 7.x and select UR 8.x modules to end-of-active-production status. For installed base operators — particularly nuclear licensees and refinery operators with 10–20 year asset lifecycles — this creates a sourcing gap that OEM channels cannot reliably fill. DriveKNMS maintains a dedicated inventory of tested UR Series modules including UR9GH, UR8GH, UR7GH, and associated I/O cards sourced from decommissioned substation equipment and controlled surplus channels.

All units are subject to pre-sale functional verification. DriveKNMS provides documentation of test results upon request and can cross-reference GE Multilin catalog numbers against superseded part numbers to confirm compatibility. For operators requiring long-term maintenance agreements or consignment stock arrangements for UR Series spares, contact the procurement team directly.

Quality Control for the UR Series Range

The UR platform's backplane uses a high-speed serial bus for inter-module communication. Standard bench testing is insufficient to validate CPU and communications modules such as the UR9GH without a live UR chassis environment. DriveKNMS employs the following verification protocol for UR Series modules:

• Chassis-level power-on test using a reference UR frame with known-good power supply
• Firmware version readback and comparison against GE Multilin release matrix
• Backplane communication integrity check: CPU-to-I/O module handshake verification across all populated slots
• Ethernet port link negotiation test (10/100/1000 Mbps auto-negotiation confirmation)
• IEC 61850 MMS server response test using a reference client (where applicable to module type)
• Visual inspection: capacitor condition, connector pin integrity, conformal coating status
• Burn-in cycle: 48-hour powered operation at ambient temperature prior to shipment