GE UR Series Modules: UR6DH UR 6DH Digital Input/Output —

Technical Dossier

Product Details And Specifications

GE UR Series: Comprehensive Module Range and Technical Overview

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 chemical processing plants, nuclear power stations, oil refineries, offshore platforms, and high-voltage transmission substations, the UR platform provides a standardized, modular architecture for feeder, transformer, motor, generator, and bus protection. Its distributed I/O design and IEC 61850 compatibility have made it a reference standard in utility-grade protection engineering since the late 1990s. The UR6DH / UR 6DH is a Digital Input/Output module within this platform, providing hardwired contact sensing and output relay control for UR chassis-based relay systems.

The Evolution of UR Series Architecture

The UR platform was introduced in the late 1990s as a successor to GE's earlier SR (System Relay) and DFP (Digital Feeder Protection) product lines. The first-generation UR chassis used a 19-inch rack form factor with a passive backplane and modular plug-in cards, allowing field engineers to configure relay functions by populating specific module slots. Early firmware revisions (pre-v3.x) supported DNP3 and Modbus RTU communications only. From firmware v4.x onward, IEC 61850 GOOSE messaging and IEEE 1588 precision time protocol were introduced, enabling the UR platform to integrate into modern digital substation architectures. The transition from copper-based I/O wiring to fiber-optic inter-relay communication (via the UR's built-in IRIG-B and IEEE C37.94 ports) marked a significant architectural shift. Current production UR relays (UR-series 7xx and 8xx firmware) maintain backward compatibility with legacy 6xx-series I/O modules such as the UR6DH, making long-term mixed-generation installations viable. However, GE has progressively moved end-of-active-production on many 6xx-series modules, placing them in the sustained engineering / lifecycle support phase.

UR Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the GE UR Series platform. Modules are categorized by functional type:

Digital Input / Output Modules

• UR6DH: 24-channel digital input/output module for UR chassis hardwired contact I/O
• UR6AH: 8-channel high-speed digital input module, 24 Vdc wet contact sensing
• UR6BH: 16-channel digital input module with configurable threshold voltage
• UR6CH: 8-output digital relay output module, Form-C contacts, 10 A rated
• UR6EH: 4-channel fast output module for high-speed trip applications (<4 ms)
• UR6FH: Mixed I/O module, 8 digital inputs + 4 relay outputs, general-purpose

Analog Input Modules

• UR6GH: 4-channel analog input module, 4–20 mA / 0–10 V configurable
• UR6JH: CT/VT analog input module, 4 current + 4 voltage channels, 1 A / 5 A CT
• UR6KH: 8-channel analog input module for RTD and thermocouple inputs

Communications & Processor Modules

• UR6PH: Main processor module, dual-core DSP, hosts relay firmware and settings database
• UR6QH: Redundant processor module for hot-standby CPU configurations
• UR6RH: Ethernet communications module, dual RJ-45 / fiber SFP, IEC 61850 Ed.2
• UR6SH: Serial communications module, RS-485 / RS-232, DNP3 & Modbus RTU
• UR6TH: IEEE 1588 / IRIG-B time synchronization module

Power Supply Modules

• UR6LH: DC power supply module, 24–250 Vdc input, 5 W internal bus output
• UR6MH: AC/DC universal power supply module, 100–240 Vac / 88–300 Vdc
• UR6NH: Redundant power supply module for high-availability chassis configurations

Sourcing Hard-to-Find & Obsolete UR Series Parts

GE Grid Solutions has transitioned a significant portion of the 6xx-series UR module range to end-of-active-production status. For operators of existing UR-based protection schemes — particularly in nuclear, petrochemical, and long-lifecycle utility installations — replacement sourcing is a critical operational requirement. DriveKNMS maintains a dedicated inventory of new-surplus, refurbished, and tested UR Series modules including the UR6DH, UR6AH, UR6JH, and UR6PH. All units are sourced from decommissioned substation equipment, OEM overstock, and authorized distributor closeouts. DriveKNMS provides full traceability documentation, original packaging where available, and a minimum 12-month warranty on all UR Series modules. For long-term maintenance contracts covering multi-year spare parts supply agreements, contact the DriveKNMS technical sales team directly.

Quality Control for the UR Series Range

UR Series modules — particularly backplane-connected I/O and communications cards — require specialized test procedures that replicate the UR chassis bus environment. DriveKNMS employs a dedicated UR test bench comprising a populated UR chassis with active processor and firmware, allowing each module to be functionally verified under live relay conditions. Test procedures for the UR6DH and similar digital I/O modules include: contact input threshold verification across the full rated voltage range (17–300 Vdc), output relay coil resistance and contact resistance measurement, backplane connector pin integrity inspection, and firmware recognition confirmation via the UR settings software (EnerVista UR Setup). Analog modules (UR6JH, UR6GH) undergo additional calibration verification against traceable reference standards. All tested units are issued a DriveKNMS inspection certificate prior to shipment.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.