The GE Multilin UR6GH digital control I/O module is a dedicated pluggable digital input/output daughter card for the UR universal protection relay series. Manufactured in Canada, it is designed to expand binary signal acquisition and breaker closing/tripping control channels for integrated protection equipment in substations and power plants.
As standard, it is equipped with 8 channels of isolated digital inputs and 4 Form-A trip relay outputs. Adopting plug-and-play connection via the modular backplane of the UR series, it supports channel logic configuration through EnerVista software.
It caters to capacity expansion requirements of complete protection, measurement and control devices for high/low voltage power transmission & distribution systems, generator sets and transformers, and complies with industry compliance standards including IEC 61850 and NERC CIP.
It maintains stable long-term signal communication under harsh industrial environments with strong electromagnetic interference and wide temperature ranges. Serving as core supporting hardware for UR main units, it facilitates external control of circuit breakers, disconnectors, alarm contacts and trip coils.
Product Advantages
- Standardized pluggable module structure. No complete unit disassembly required; on-site replacement and maintenance can be finished within 5 minutes, greatly cutting substation outage maintenance time.
- Full-channel electrical isolation design with independent opto-isolation for inputs and outputs, preventing false signal triggering caused by grid transient surges and electromagnetic interference from variable frequency drives.
- Dedicated Form-A trip output contacts that meet the rated breaking capacity for power closing and tripping operations. Capable of directly driving circuit breaker trip coils without intermediate relays.
- Wide environmental adaptability with an operating temperature range of -40℃ to 70℃, delivering stable performance in indoor control rooms, outdoor pad-mounted transformers and offshore wind power platforms.
- Fully compatible with backplanes of all UR protection main units. Multiple modules can be stacked in the same rack for capacity expansion; a single UR device supports installation of several UR6GH modules to expand binary signal points.
- FlexLogic programmable logic embedded in underlying firmware. Interlock, alarm and sequence control logic can be programmed without additional PLC hardware.
- Supports encrypted firmware verification and upgrades, equipped with CyberSentry cybersecurity mechanism to satisfy power grid classified protection requirements and industrial cybersecurity standards.
- Managed uniformly via EnerVista configuration software. Visible parameter configuration is available for input channel debounce, output pulse duration and contact self-test functions, lowering commissioning difficulty.
Model Breakdown
The full model UR6GH follows fixed factory coding rules, split segment by segment as below:
- UR: Unified prefix for Multilin Universal Relay series
- 6: I/O function module category code, representing digital control binary expansion card
- G: Channel specification code, defining hardware configuration of 8 isolated digital inputs plus 4 Form-A trip outputs
- H: Hardware revision batch code, differentiating backplane gold finger pin definitions, insulation protection grades and contact load capacities. The H revision of this series is universally compatible with all UR main units.
Product Features
- Channel Hardware Specifications: 8-channel isolated DC digital inputs supporting passive contact acquisition at 24/48/125/250 VDC; 4 Form-A normally open trip relay outputs, each contact rated for standard power tripping loads.
- Mechanical Mounting: Horizontal slot installation for standard UR racks with metal shielded housing and IP20 ingress protection rating, compatible with 19-inch standard control cabinet racks.
- Communication Interface: Binary data is transmitted at high speed via the parallel backplane bus of the UR main unit, enabling cross-device signal sharing in coordination with the main unit’s GOOSE and IEC 61850 process bus.
- Self-Test & Diagnostics: Automatic full scan of all input and output channels upon power-up. Real-time alarm reporting of contact welding, open-circuit and short-circuit faults to the main unit HMI and supervisory background system.
- Configuration Storage: Non-volatile local memory retains all channel parameters. Settings are preserved after module removal, eliminating reconfiguration upon reinstallation.
- Anti-Interference Performance: Compliant with ANSI C37.90 EMC standard, capable of withstanding lightning surges and switching overvoltage transients common in power systems.
- Power Consumption Control: No-load power draw of a single module is less than 10 W; stacked multiple modules will not overload the main unit power supply.
Application Industries
- Power Transmission & Distribution Substations: Feeder protection, busbar protection and capacitor switching devices for expanded circuit breaker and earthing switch position monitoring plus trip control.
- Thermal / Hydro / PV / Wind Power Plants: Generator protection and auxiliary transformer protection for unit safety shutdown circuits and auxiliary contact acquisition of excitation systems.
- Rail Transit Traction Power Supply: Binary point expansion for traction transformer protection devices, interlock control of disconnectors and collection/output of fault alarm signals.
- Oil & Gas Extraction and Refining Plants: Expansion of binary measurement and control for on-site high-voltage distribution protection and ESD emergency shutdown systems.
- Large Industrial & Metallurgical Enterprises: Point expansion for self-owned power plants and integrated high-voltage motor protection devices within the plant.
- Water Conservancy Pumping Stations: Status monitoring of external valves and circuit breakers for pump station transformer and high-voltage pump protection systems.
Product Comparison
The mainstream digital I/O modules of the same series, UR6CH and UR6UH, are selected as comparison targets, with only core differences outlined below:
- UR6GH: 8 digital inputs + 4 Form‑A trip outputs. Designed for protection circuits requiring direct drive of trip coils. Its contact breaking capacity matches tripping loads with a moderate number of points, serving as the standard configuration for substation feeder protection.
- UR6CH: 8 digital inputs + 8 Form‑C changeover contact outputs. SPDT contacts provide both normally open and normally closed signal paths. Primarily used for alarms, indicator lights and intermediate relay control, and not suitable for high‑power tripping circuits.
- UR6UH: 16 digital inputs + 16 general signal outputs. High‑density point expansion for centralized acquisition of massive disconnector and auxiliary contacts. No dedicated trip contacts available; cannot directly drive circuit breaker coils.
Supporting Products
- UR Series Protection Main UnitsFull lineup including F60 Feeder Protection Relay, T60 Transformer Protection Relay, G60 Generator Protection Relay, L90 Line Differential Protection Relay and C30 Universal Controller.
- Supporting Configuration SoftwareEnerVista Launchpad: Dedicated software for device parameter setting, logic programming, firmware upgrading and fault diagnosis.
- Communication Expansion Daughter CardsUR81H process bus module; UR9EH / UR9GH CPU main control modules.
- Auxiliary Electrical Accessories24 VDC operating power supply, isolated terminal blocks, secondary trip intermediate relays, cabinet signal indicator lamps.
- Maintenance & Test ToolsGE original relay protection test set, EnerVista offline simulation software.
Frequently Asked Questions
Q: Is the UR6GH compatible with the first-generation legacy UR protection devices?A: The pin layout of the backplane for hardware revision H is universal. It is fully compatible with all first-generation UR and second-generation UR Plus main units. Direct plug-and-play operation is supported without replacing the complete unit backplane.
Q: What is the maximum number of UR6GH modules that can be installed on a single F60 feeder relay?A: The standard F60 rack is equipped with 4 reserved I/O expansion slots, allowing up to 4 UR6GH modules to be installed simultaneously. It can expand a maximum of 32 digital input channels and 16 trip output channels.
Q: How to troubleshoot persistent open-circuit alarms on the input channels of UR6GH?A: Power off the unit first and check the tightness of wiring terminals for external contacts, then measure the DC voltage of the circuit. If no voltage is detected, inspect the on-site auxiliary switches. If voltage reading is normal, the module’s input circuit is damaged and module replacement is required.
Q: Why are Form‑A output contacts unable to drive trip coils?A: Verify the operating voltage of the coil and the contact load specifications of the module. If the load current exceeds the rated breaking capacity of the contacts, an intermediate relay shall be added for signal transfer.
Q: Do the original logic configurations need to be reprogrammed after replacing the UR6GH module?A: The module only stores basic channel parameters, while interlock logic is stored in the main unit CPU module. No FlexLogic reprogramming is required when replacing with an identical model module.
Q: How to resolve frequent communication disconnections of UR6GH installed in low‑temperature outdoor cabinets?A: Confirm the cabinet temperature control heater functions properly. The minimum stable operating temperature of the module is -40℃. A constant-temperature thermal insulation cabinet must be installed if the ambient temperature falls below this limit.
Q: What should I do if EnerVista software fails to detect the newly inserted UR6GH module?A: Power off and reinsert the module to ensure the buckle is fully locked. Upgrade the main unit CPU firmware to Version V7.6 or higher, then refresh the hardware list for identification.
Related Product Models
- UR6CH Digital I/O Module
- UR6UH Digital I/O Module
- UR9EH CPU Control Module
- UR9GH CPU Processing Module
- UR9HH Main CPU Module
- UR9JH Advanced Logic CPU Module
- UR9KH High Speed CPU Module
- UR81H Process Bus Communication Module
- UR7AH RTD Analog Input Module
- UR5AH DC mA Transducer Module
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