GE UR9CH Protective Relay, Control Module

GE Multilin UR-9CH CPU Module

Product Type: CPU Module
Series: Universal Relays (UR Series)
Manufacturer: General Electric Multilin (GE)
Manufacturing Location: Markham, Ontario, Canada

Technical Specifications

• Weight: Approx. 1 lb 10 oz (750 g)

• Dimensions: Approx. 6.5” (L) x 6” (W) x 2.5” (H)

• Communication Ports: RS485, 10Base-F Ethernet

• Compatible Modules: CT/VT, Power Supply, I/O Modules, Transducer I/O, Inter-relay Communications

Product Overview

The UR-9CH is a CPU module designed for GE Multilin's Universal Relays (UR) series. It serves as the primary computing engine of the relay, executing protection algorithms, logic processing, and communication functions. The module directly impacts the relay’s software and communication capabilities, including support for Ethernet, IEEE 1588, and Parallel Redundancy Protocol (PRP), depending on the model variant.

As part of a modular system, the UR-9CH CPU works in conjunction with other modules such as:

• CT/VT Modules

• Contact Input/Output Modules

• Power Supply Modules

• Transducer Input/Output Modules

• Inter-relay Communication Modules

Each module slot within the UR system contributes to the long model numbers characteristic of this series—each segment identifying a specific module type and version.

Functionality

The UR-9CH handles various input/output signals and manages data communications over multiple network interfaces. It also enables specific relay ports like the RS485 port located on the back panel. The CPU ensures the coordination and control of protective and monitoring functions in critical applications such as:

• Feeder Protection (e.g., F60 units)

• Capacitor Bank Protection (e.g., C70 units)

Compatibility and Version Information

The UR-9CH is classified as an older-generation CPU module in the UR series. It is equipped with:

• RS485 communication

• 10Base-F Ethernet

Due to its legacy design, the UR-9CH requires compatibility with older series modules, such as CT/VT models 8A, 8B, 8C, or 8D. For example, if used in an F35 relay, all associated modules must also belong to the earlier generation.

Limitations of Using an Older CPU Module

Using an older CPU like the UR-9CH may pose the following limitations:

• Incompatibility with newer CT/VT or I/O modules

• Limited support for modern high-speed network protocols

• Reduced processing capacity compared to newer CPUs

• Restricted software and firmware upgrade options

For applications requiring higher processing power, advanced network protocols, or newer module compatibility, upgrading to a newer CPU version is strongly recommended.