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UR8AH

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The GE UR8AH is a CT/VT module for Multilin UR relays, providing 6 CT inputs (3 phase + 3 ground) and 4 VT inputs for power system monitoring and protection.
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Technical specifications for UR8AH

  • Manufacturer:
    General Electric
  • Part Number:
    UR8AH
  • Product Family:
    GE Multilin
  • Product Type:
    CT/VT Module
  • Stock:
    4
  • CT Inputs:
    6 total (3 phase + 3 ground), 1A/5A selectable
  • VT Inputs:
    4, compatible with 115/230/460/575V
  • Configuration:
    Standard 4CT/4VT
  • Compatible CPU Modules:
    UR-9A, UR-9C, UR-9D (for firmware 3.5x or earlier)
  • Firmware Compatibility:
    3.5x or earlier
  • Communication Protocols:
    Modbus RTU, Modbus TCP/IP
  • Physical Interfaces:
    RS232, RS485, Ethernet
  • Power Supply:
    24-48 VDC (module power)
  • Operating Temperature:
    -40°C to +70°C
  • Storage Temperature:
    -40°C to +85°C
  • Weight:
    1.2 kg
  • Estimated shipping dimensions:
    4x18.5x17.2cm
  • Tariff Code:
    8517795000
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Application Performance & Efficiency Operational Scenarios

Features:

  • Provides comprehensive current and voltage signal acquisition for power system monitoring
  • Supports multiple CT secondary ratings with dedicated ground CTs for high-resistance grounded systems
  • Designed for older UR systems with firmware 3.5x or earlier and compatible CPU modules
The UR8AH is a high-density CT/VT input module that provides 6 current transformer inputs (3 phase CTs and 3 dedicated ground CTs) and 4 voltage transformer inputs . This 6CT+4VT configuration ensures comprehensive signal acquisition for power system protection, making it particularly valuable for detecting ground faults in high-resistance grounded systems where standard 4CT modules cannot provide accurate detection . The module scales down primary current and voltage values to levels that the UR relay can process, enabling precise measurement of voltage, current, power, energy, frequency, and demand.

The UR8AH supports both 1A and 5A CT secondary ratings, providing flexibility to match various field-installed current transformers . The VT inputs are compatible with multiple primary voltage levels including 115V, 230V, 460V, and 575V, accommodating different power system voltage classes . This flexibility allows the UR8AH to be deployed across a wide range of applications, from low-voltage industrial distribution to high-voltage transmission systems.

The UR8AH is an older generation CT/VT module that accepts firmware version 3.5x or earlier and is compatible with CPU modules such as the UR-9A, UR-9C, and UR-9D . It is configured and monitored using GE's EnerVista UR software, which provides a user-friendly interface for adjusting CT/VT settings, trending data, and exporting measurements . The module supports Modbus RTU and Modbus TCP/IP protocols, enabling integration with SCADA systems, PLCs, and RTUs for remote monitoring and control.

The UR8AH GE CT/VT Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).

GE UR8AH CT/VT Module Manuals, Datasheets, Drivers, Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
GE UR8AH CT/VT Module Specs

General

  • Manufacturer GE
  • Model UR8AH
  • Condition New Original ready stock
  • Product Family UR8FH,UR8HH,UR8CH,UR8NH,UR8LH,UR8GH
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Power Transmission & Substation Automation: Integrated into central grid networks to drive distance, differential, and overcurrent line-protection schemes.
  • Large Machinery & Generator Infrastructure: Feeds high-accuracy electrical signals to host relays handling synchronous generator monitoring, stator ground-fault tracking, and heavy industrial motor management.
  • Industrial Plants & Power Distribution: Monitored within high-demand heavy manufacturing facilities (such as steel mills, chemical plants, and refineries) to govern incoming transformer feeds and capacitor banks.
  • High-Sampling Accuracy: Delivers high-precision analog-to-digital signal conversion, ensuring that the host UR Digital Signal Processor (DSP) receives pure, uncorrupted wave metrics to execute fault-calculation formulas.
  • Thermal Resilience & Ruggedization: Built to operate seamlessly under wide industrial temperature variations spanning from -40°C to 85°C and 5% to 95% non-condensing humidity.
  • Maintenance Efficiency: Utilizing the UR platform's architecture, the module supports standard field replacement workflows, drastically minimizing substation downtime during hardware expansions or replacements.
  • Three-Phase & Ground Current Tracking: Used to map a comprehensive standard grid node by assigning three channels to Phase currents (A, B, C), one channel to Ground/Neutral current monitoring, and four channels to Phase/Busbar voltages.
  • Digital Fault & Sequence of Events Recording (SOE): Captures precise waveform behavior when a breaker trips. This data is fed back into GE’s EnerVista UR software suite to perform predictive grid analytics and post-fault root-cause analysis.
  • Substation SCADA / DCS Integration: Functions as the analog collection anchor inside UR series bays (e.g., G60, T60, B30 protection relays). This allows real-time current, voltage, and power factor telemetry data to stream upstream via protocols like IEC 61850.
Description
The GE UR8AH is a CT/VT (Current Transformer/Voltage Transformer) input module designed for the GE Multilin Universal Relay (UR) series, serving as the analog signal acquisition front-end for power system protection and monitoring . It provides the critical interface between the power system's instrument transformers and the UR relay's CPU, scaling down high-voltage and high-current signals to levels the relay can process.

The GE UR8AH features a high-density configuration with 6 current transformer (CT) inputs (3 phase CTs + 3 dedicated ground CTs) and 4 voltage transformer (VT) inputs . The CT inputs support both 1A and 5A secondary ratings, while the VT inputs are adaptable to various primary voltage levels including 115V, 230V, 460V, and 575V.

The GE UR8AH is an older generation CT/VT module that accepts firmware versions 3.5x or earlier and should be matched with compatible CPU modules such as the UR-9A, UR-9C, or UR-9D . It is described as having a standard 4CT/4VT configuration, similar to the newer UR-8F module, but with specific compatibility restrictions for older CPU revisions.

The GE UR8AH supports configuration and monitoring via GE's EnerVista UR software, which provides a user-friendly interface for adjusting CT/VT settings, trending system data, and exporting measurement values . The UR family supports multiple communication protocols including Modbus RTU (via RS232/RS485) and Modbus TCP/IP (via Ethernet), allowing integration with SCADA systems, PLCs, and RTUs.
Alternative Names
UR8FH UR8HH UR8CH UR8LV UR8NH UR8FV UR8GH UR6PH
Technical notes
The GE UR8AH is an older CT/VT input module for the Multilin UR series, featuring 6 CT (3 phase + 3 ground, 1A/5A) and 4 VT inputs. It supports firmware 3.5x or earlier and is compatible with UR-9A/9C/9D CPUs. Modbus RTU and TCP/IP are supported for system integration . It is a legacy part for maintaining existing UR installations.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is the primary function of the GE UR8AH?
It is a CT/VT input module that scales down high-voltage and high-current signals for monitoring and protection in GE Multilin UR relays.
How many CT and VT inputs does the UR8AH provide?
It provides 6 CT inputs (3 phase + 3 ground, 1A/5A) and 4 VT inputs compatible with multiple voltage levels.
Which CPU modules are compatible with the UR8AH?
The UR8AH is compatible with UR-9A, UR-9C, and UR-9D modules, and accepts firmware version 3.5x or earlier.
What communication protocols does the UR8AH support?
It supports Modbus RTU via RS232/RS485 and Modbus TCP/IP via Ethernet for SCADA and PLC integration.

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