The UR-9CH is a CPU processor module from GE Multilin's Universal Relay (UR) series, designed to provide the central computing power and communication capabilities for UR platform protection relays . As the "brain" of the relay, this module executes protection algorithms, logic processing, and coordinates communication across the entire system.
GE Multilin UR-9CH CPU Module with 10BaseF Fiber Optic CommunicationOverview
The UR-9CH is a CPU processor module from GE Multilin's Universal Relay (UR) series, designed to provide the central computing power and communication capabilities for UR platform protection relays . As the "brain" of the relay, this module executes protection algorithms, logic processing, and coordinates communication across the entire system.
This specific module variant is equipped with both RS485 serial communication and a 10BaseF fiber optic Ethernet interface, making it suitable for substation automation and industrial environments where electromagnetic interference (EMI) immunity is critica.UR9CH
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Key Features
Fiber Optic Communication (10BaseF)
The UR-9CH's 10BaseF Ethernet port operates at 10 Mbps over fiber optic cable, providing inherent electrical isolation and high immunity to EMI/RFI. This makes it ideal for harsh electrical environments such as substations and industrial plants.
Central Processing Capability
The module serves as the primary computing engine for the UR relay, running protection algorithms, control logic, and system diagnostics in real time . It supports critical functions including fault detection, event recording, and system configuration .
System Coordination
The UR-9CH interfaces directly with other UR series modules — CT/VT input modules, power supply modules, I/O modules, and inter-relay communication modules — automatically establishing voltage and current input parameters without manual intervention.
Technical Specifications
Product Type | CPU Processor Module |
Series | Universal Relays (UR) |
Communication Interfaces | RS485, 10BaseF Ethernet (fiber optic) |
Fiber Type | Multi-mode, 820 nm wavelength |
Fiber Sizes Supported | 50/125 µm, 62.5/125 µm, 100/140 µm |
Connector Type | ST-type (twist-lock) |
Operating Temperature | -40°C to +70°C (-40°F to +158°F) |
Manufacturing Location | Markham, Ontario, Canada |
Weight | Approx. 750 g (1 lb 10 oz) |
Note: The 10BaseF port is designed to maintain consistent response times for fiber cores up to 100 µm in diameter.
Compatibility Notes
The UR-9CH is classified as an older-generation CPU module within the UR series. This has important compatibility implications :
Compatible CT/VT Modules: Must be paired with older series modules — 8A, 8B, 8C, or 8D
Incompatibility: Mixing new CT/VT modules with the UR-9CH may cause display errors, incorrect scaling, or hardware mismatch indicators
Order Code: In complete relay order codes, the UR-9CH corresponds to the CPU designation 9C (e.g., C6M-9UH-00K)
Applications
The UR-9CH CPU module is deployed in:
Substation automation systems requiring fiber optic communication for EMI immunity
Power system protection and monitoring (feeder protection, capacitor bank protection)
Industrial control systems with Ethernet-based communication networks
Mission-critical environments where secure, isolated data transmission is essential
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