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        UR4DH

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        The GE UR4DH (one of the Multilin UR series products) is a digital input/output (I/O) module designed to provide high-density contact monitoring and control for power system protection.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for UR4DH

        • Manufacturer:
          General Electric
        • Part Number:
          UR4DH
        • Product Family:
          GE Multilin
        • Product Type:
          Digital I/O module
        • Input Capacity:
          Up to 96 contact inputs
        • Input Voltage Rating:
          24V DC to 250V AC
        • Output Capacity:
          Up to 64 contact outputs
        • Output Types:
          Form-A, Form-C, Latching, Fast Form-C, and Solid State Relay (SSR)
        • Activation Speed:
          < 4ms for Form-A digital outputs
        • Response Time:
          < 10ms for state changes (general digital inputs)
        • Weight:
          0.9 kg
        • Estimated shipping dimensions:
          4x18.5x17.1cm
        • Tariff Code:
          8537101190
        • 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 Use Cases Diagnostics & Protection Installation & Integration

        Features:

        • Interface Between Primary Substation Equipment and Protective Relay Logic Processor
        • High-Density Contact Monitoring with Millisecond Precision Signal Capture
        • Deployment in Busbar Protection and Breaker Management Schemes
        The General Electric UR4DH operates as a high-performance digital Input/Output (I/O) module in the Multilin UR Series, providing high-density contact monitoring and control for power system protection. It continuously processes status signals from primary substation equipment and delivers them to the protective relay's logic processor with millisecond-level accuracy. The UR4DH handles a dense configuration of contact inputs, allowing a single relay to manage multiple circuit breaker positions, disconnect switch statuses, and external alarm contacts without requiring additional external hardware. Seamless signal processing is standard with the UR4DH, and its fast digital inputs effectively resolve contact bounce and electrical noise interference issues.

        The UR4DH provides essential I/O functions critical to the protection scheme, directly affecting the proper operation of the overall relay system. One or more UR4DH modules may be deployed depending on the required input density and monitoring scope. The UR4DH occupies a dedicated slot within the UR Series rack architecture and integrates seamlessly with other Multilin UR Series modules.

        For complex substation automation applications, the UR4DH handles the "a" and "b" auxiliary contacts of high-voltage circuit breakers to confirm their open or closed state. In addition to standard contact monitoring, the UR4DH performs rapid execution of control commands in Remedial Action Schemes (RAS) or Wide Area Monitoring systems. Using this method, the UR4DH ensures that critical output commands are delivered reliably under extreme environmental conditions, including high-electromagnetic interference (EMI) environments. If the system detects signal anomalies or noise interference, the UR4DH filters these disturbances to prevent false trips or failure to operate during genuine electrical faults.

        The UR4DH General Electric Digital I/O Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        General Electric UR4DH Digital I/O Communications Module Manuals,Datasheets,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.
        General Electric UR4DH Digital I/O Communications Module Specs

        General

        • Manufacturer General Electric
        • Model UR4DH
        • Condition New Original ready stock
        • Product Family URRHH,UR9UH,UR8LH,UR6CH
        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.
        • Breaker Control: This UR4DH module is used to monitor "a" and "b" auxiliary contacts and provide trip/close commands to high-voltage circuit breakers.
        • Status Monitoring: It tracks the positions of disconnect switches and earth switches across an entire bay.
        • Load Shedding: In industrial plants, the UR4DH handles the rapid execution of load-shedding commands to prevent total system collapse during a frequency drop.
        • Contact Monitoring: The UR4DH performs continuous supervision of the output circuitry to detect "open" or "short" conditions in the control loop before a command is even sent.
        • Signal Filtering: It utilizes advanced digital filtering to eliminate "contact bounce" and electrical noise, which prevents the relay from processing false status changes during high-EMI events like lightning strikes or switching surges.
        • Sequence of Events (SOE): This UR4DH module timestamps every state change with millisecond precision, allowing engineers to perform post-fault analysis to determine the exact order of operations during a blackout.
        • Plug-and-Play Slot Design: The UR4DH slides into any available universal slot (typically slots F through M) of a UR-series chassis, allowing for field upgrades without replacing the entire protection system.
        • EnerVista Software: Integration is managed via the EnerVista UR Setup tool, which solves the complexity of manual I/O mapping by providing a graphical interface for logic programming and GOOSE messaging (IEC 61850).
        • Terminal Wiring: It features a removable, hinged terminal block that simplifies the wiring process and allows for the module to be replaced without disconnecting individual wires from the field.
        Description
        The General Electric UR4DH (part of the Multilin UR Series) is a high-performance digital Input/Output (I/O) module designed to provide high-density contact monitoring and control for power system protection. This UR4DH module acts as a critical interface between primary substation equipment and the protective relay’s logic processor, ensuring that status signals are captured with millisecond precision.

        The UR4DH is specifically designed to handle the challenge of complex substation automation where a high volume of status points must be monitored simultaneously. It solves the problem of "input scarcity" in large-scale installations by offering a dense configuration of contact inputs, allowing a single relay to manage multiple circuit breaker positions, disconnect switch statuses, and external alarm contacts without requiring additional external hardware.

        In terms of specific application scenarios, the UR4DH is often deployed in Busbar Protection and Breaker Management schemes. For example, this UR4DH module is used to process the "a" and "b" auxiliary contacts of high-voltage circuit breakers to confirm their open or closed state. By providing fast and secure digital inputs, the UR4DH solves the issue of "contact bounce" and electrical noise interference, ensuring the relay does not trigger a false trip or fail to operate during a genuine electrical fault.

        Furthermore, the UR4DH is utilized in Remedial Action Schemes (RAS) or Wide Area Monitoring systems where high-speed communication is vital. In these scenarios, the UR4DH handles the rapid execution of control commands, such as shedding load or tripping generation sources to maintain grid stability. This UR4DH hardware ensures that these critical output commands are delivered reliably under extreme environmental conditions, solving the problem of equipment failure in high-electromagnetic interference (EMI) environments.
        Alternative Names
        UR8FH UR8HH UR1HH UR6PH URRHH UR9GH UR67H UR6EH
        Technical notes
        UR4DH is a Universal Relay module from GE Multilin’s UR series, designed for advanced power system protection, control, and monitoring. It features a modular, field-configurable architecture supporting up to 4 analog inputs and 16 digital I/O points. The UR4DH operates on 125/250 V DC or 120/240 V AC control power and includes a large 128x64 pixel LCD with keypad for local interface.
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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.
        VIEW ALL FAQS
        What is the General Electric UR4DH module?
        The General Electric UR4DH is a high-performance digital Input/Output (I/O) module in the Multilin UR Series. It is designed to provide high-density contact monitoring and control, acting as a key interface between primary substation equipment and a protective relay’s logic processor, ensuring precise signal acquisition within milliseconds.
        What problem does the UR4DH solve in substation automation systems?
        The UR4DH addresses the challenge of monitoring a large number of status points in complex substations. It eliminates “input scarcity” by offering a dense configuration of digital inputs, allowing a single relay to handle multiple circuit breakers, disconnect switches, and alarm signals without requiring additional external hardware.
        How is the UR4DH used in practical power system applications?
        The UR4DH is widely used in busbar protection and breaker management schemes. It processes auxiliary contacts of high-voltage circuit breakers to determine their open or closed status, ensuring accurate and real-time system monitoring.

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