Description
Key Technical Specifications
| Parameter | Details |
|---|---|
| Model | UR9KH |
| Catalog designation | UR-9K-H |
| Manufacturer | GE Multilin |
| Product family | Universal Relay (UR) |
| Product type | CPU / processor module |
| Main function | Relay logic processing and communication coordination |
| Serial communication | RS-485 |
| Fiber-optic interface | Multimode ST fiber |
| Ethernet networking | Redundant 100Base-FX is documented for the UR-9K-H configuration |
| Firmware compatibility | Must be verified against the host relay and installed firmware |
| Protection functions | Determined by the host relay model and its configuration |
| Power requirements | Verify the applicable relay manual; do not infer supply ratings from the CPU module code |
| Installation | Host relay chassis or designated module position, according to the equipment manual |
| Operating temperature | Confirm the applicable GE specification |
| Protection rating | No standalone IP rating established for the module |
| Lifecycle status | Listed as discontinued in secondary catalog information; verify current manufacturer support |
The UR-9K-H catalog description supports the serial and fiber-network identification. Other listings conflict on whether the module has copper Ethernet, so verify the actual front-panel ports and hardware label before designing the network connection.
Major Features and Advantages
Central relay processing: The UR9KH serves as the processor module in a compatible Universal Relay. It executes the relay’s configured logic and coordinates the functions of the associated hardware. The protection functions available to the user depend on the host relay model, installed options, and application settings.
Serial communications: The RS-485 interface supports serial communication with compatible equipment. Integration requires matching the protocol, device address, baud rate, parity, and other communication parameters specified for the installation.
Fiber-optic network connectivity: The UR-9K-H version is listed with multimode ST fiber-optic connectivity and redundant 100Base-FX networking. Fiber can support electrical isolation between connected equipment and reduce susceptibility to electromagnetic interference along the communication path. Verify the port configuration and fiber requirements of the exact module.
Support for power-system protection: The broader GE Multilin UR family serves applications involving generators, transformers, feeders, motors, and other electrical assets. The CPU module must be matched to the specific relay and protection scheme; it does not independently provide all of those functions.
Legacy system maintenance: Where an installed UR relay uses the UR9KH, preserving the correct hardware configuration can help avoid unnecessary changes to protection settings and communications. Firmware and module compatibility still require verification before a replacement is commissioned.
UR9KH
Application Scenarios and Common Maintenance Risks
- Substation protection: Maintain processor hardware in compatible UR-series relays used for electrical protection and control.
- Industrial power distribution: Support relay logic and supervisory communication in plant electrical systems.
- Fiber-networked protection systems: Replace a CPU module where the installed relay requires the documented multimode ST fiber interface.
- Legacy relay servicing: Identify the exact CPU variant and firmware before arranging a replacement during a planned outage.
Field note: A relay communication fault does not automatically indicate CPU failure. Check the fiber transceivers, cable condition, network configuration, serial wiring, and host-relay diagnostics before condemning the module.
Related GE Multilin Products
| Model | General identification |
|---|---|
| UR9KH | Target CPU module, associated with the UR-9K-H designation |
| UR9EH | Related UR-series CPU module; verify hardware and interface differences |
| UR9WH | Another UR-series CPU variant; compatibility requires confirmation |
| UR6AV | UR-series analog I/O module |
| UR6CH | UR-series I/O module; verify its specific function |
| UR8FH | UR-series CT/VT module family |
| UR1HH | UR-series power-supply module |
These are related products within the broader UR protection system family, not confirmed direct substitutes. Confirm the host relay’s supported module list and exact order code before using any alternative.
Engineer’s Guide: Before Ordering or Installation
1. Check the complete module designation. Confirm whether the label reads UR9KH or UR-9K-H, and record any additional hardware or modification identifiers.
2. Verify the communication hardware. Inspect whether the installed module has RS-485 and multimode ST fiber ports. Confirm whether the system requires redundant 100Base-FX connections; do not rely on a generic catalog description alone.
3. Confirm relay and firmware compatibility. Record the host relay model, firmware version, configuration files, and communication settings. Preserve the existing settings before replacement and follow the manufacturer’s procedure for restoring or validating them.
Safety warning: This is part of an electrical protection system. Use the approved maintenance procedure and perform the required protection and communication checks before returning the relay to service.
Frequently Asked Questions
What is the GE Multilin UR9KH used for?
It is a CPU module for compatible GE Multilin Universal Relay systems. It processes relay logic and coordinates communications within the host protection device.
Is the same as UR-9K-H?
The designations are associated in catalog listings. Confirm the physical label and complete module configuration to ensure the offered unit matches the installed hardware.
What communication interfaces does the support?
The UR-9K-H catalog description identifies RS-485 and multimode ST fiber-optic connectivity for redundant 100Base-FX networking. Because secondary listings differ on the exact port arrangement, verify the installed module before making connection plans.
Can the be used in any GE Multilin UR relay?
Do not assume universal compatibility. Check the host relay’s supported CPU modules, firmware requirements, and communication options before ordering or installing a replacement.
What should be checked if the relay does not communicate after replacement?
Check the module identification, firmware and configuration compatibility, RS-485 settings, fiber type and connectors, network topology, and host-relay diagnostic messages. Follow the relay manual before changing protection settings.
Is the discontinued?
A secondary parts catalog lists the UR-9K-H as discontinued by the manufacturer. Current support and availability should be confirmed for the exact module and host relay.
What should buyers verify when sourcing a ?
Confirm the exact module code, hardware condition, port configuration, firmware compatibility, test records, warranty terms, and dispatch lead time. For refurbished units, request documentation of the inspection and functional tests actually performed.
Recommended product listing title: GE Multilin UR-9K-H Universal Relay CPU Module with RS-485 and Fiber-Optic Networking
