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

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 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

Q: How is condition confirmed before quotation?
A: Available condition, photos, test records and documentation are checked according to the requested model and sourcing channel before a formal RFQ response.

Quality Control for the UR Series Range

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.