GE UR Series Modules UR-9HH CPU Module - UR9HH UR 9HH

Technical Dossier

Product Details And Specifications

GE UR Series Technical Notes

The GE UR (Universal Relay) Series, developed by GE Grid Solutions (formerly GE Multilin), is one of the most widely deployed protection relay platforms in global heavy industry. Installed across petrochemical complexes, nuclear power stations, oil refineries, offshore platforms, and high-voltage transmission substations, the UR Series provides a unified hardware architecture for feeder, transformer, motor, generator, bus, and line protection applications. Its modular slot-based chassis design allows end users to configure protection IEDs (Intelligent Electronic Devices) to exact application requirements without replacing the entire relay unit. The platform's longevity — spanning from the late 1990s to the present — has made it a de facto standard in utility and industrial protection engineering, with millions of installed units across North America, Europe, the Middle East, and Asia-Pacific.

The Evolution of UR Series Architecture

The UR Series was introduced by GE Multilin in the late 1990s as a successor to earlier discrete relay technologies, consolidating protection, control, metering, and communications into a single IED platform. The first-generation UR chassis used a 19-slot modular backplane with a proprietary high-speed inter-module bus. Early CPU modules (Type 9E, 9F) provided basic ANSI protection functions with RS-232/RS-485 serial communications. The second generation introduced Ethernet-capable CPU modules (Type 9G, 9H) supporting IEC 61850 GOOSE messaging, DNP3, and Modbus TCP — enabling integration into modern SCADA and substation automation systems.

The UR-9HH represents the high-performance tier of the current UR CPU generation, featuring dual Ethernet ports, enhanced processing capacity for complex protection schemes, and full IEC 61850 Edition 2 compliance. Compatibility across UR chassis generations (UR, URplus, UR-D) requires careful firmware and hardware revision matching. Modules from early-generation chassis (pre-2005) are not directly interchangeable with URplus-era hardware without backplane and firmware validation. As the UR Series has entered its mature/end-of-active-production phase for several sub-models, long-term maintenance support and lifecycle extension sourcing have become critical operational requirements for asset owners.

UR Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed modules within the GE UR Series platform, classified by functional category:

CPU / Processing Modules

• UR-9HH: Dual-Ethernet high-performance CPU module, IEC 61850 Ed.2, DNP3, Modbus TCP
• UR-9H: Single-Ethernet CPU module, IEC 61850, standard processing capacity
• UR-9G: Ethernet CPU module, IEC 61850 Ed.1, legacy GOOSE support
• UR-9F: Serial communications CPU, RS-232/RS-485, Modbus RTU, DNP3 serial
• UR-9E: Base CPU module, serial only, early-generation UR chassis compatible

AC/DC Analog Input Modules

• UR-4A: 4-channel AC current input module, 1A/5A selectable CT input
• UR-4B: 8-channel AC current input module, high-density CT termination
• UR-4C: AC voltage input module, 4-channel VT input, 100–240 VAC range
• UR-4D: Combined AC current and voltage input module, mixed CT/VT termination
• UR-4L: Low-level analog input module, 0–1 mA / 0–10 V transducer inputs

Digital Input / Output Modules

• UR-8D: 16-channel digital input module, optically isolated, 24–250 VDC/VAC
• UR-8E: 8-channel form-C relay output module, 8A contact rating
• UR-8F: 16-channel high-density digital input module, wet/dry contact selectable
• UR-8G: Fast output module, 4-channel solid-state output, <1 ms operate time

Communications / Interface Modules

• UR-7H: IEEE C37.94 fiber optic communications module, multiplexed teleprotection
• UR-7SS: Direct transfer trip (DTT) communications module, pilot protection interface
• UR-7SR: Serial communications module, RS-232/RS-485 dual-port, protocol-agnostic

Power Supply Modules

• UR-0A: DC power supply module, 24–48 VDC input range, internal chassis power
• UR-0B: DC power supply module, 110–250 VDC / 100–240 VAC universal input

Sourcing Hard-to-Find & Obsolete UR Series Parts

Several UR Series modules — particularly early-generation CPU types (9E, 9F) and first-revision I/O modules — have been discontinued by GE Grid Solutions and are no longer available through standard distribution channels. For asset owners operating UR-based protection systems in substations and industrial facilities with 15–30 year design lifespans, replacement sourcing from the open market is the primary maintenance strategy.

Quality Control for the UR Series Range

UR Series modules incorporate a high-speed proprietary inter-module backplane bus operating at rates that require specialized test equipment for validation. DriveKNMS applies the following test protocol to all UR Series modules prior to shipment:

• Backplane bus integrity test: Verification of inter-slot communication between CPU and I/O modules using a reference UR chassis under live firmware.
• CT/VT input calibration: AC input modules are tested against calibrated current and voltage sources at rated burden to verify metering accuracy within ±0.2%.
• Digital I/O functional test: All input channels verified for threshold response; all output contacts tested for operate time, contact resistance (<0.5 Ω), and rated current carry.
• CPU communications validation: Ethernet CPU modules (9G, 9H, 9HH) are tested for IEC 61850 GOOSE publish/subscribe, DNP3 polling response, and Modbus TCP register read/write under simulated SCADA load.
• Firmware revision audit: CPU module firmware is read and documented. Customers are advised of available upgrade paths or compatibility constraints relative to their installed chassis revision.
• Thermal burn-in: Modules are operated at rated voltage for a minimum of 24 hours in a controlled thermal environment prior to final inspection.