Product Core Summary
- Model: F35-CPU-UR-W-03 (GE Part No. 1904-0055 Rev. W03)
- Manufacturer: GE Grid Solutions (formerly GE Multilin)
- Core Function: Latest-generation main CPU module for the Multilin F35 Feeder Management Relay, providing significantly higher processing power, expanded memory, and full support for modern cyber-security features (RBAC, Syslog, secure firmware upgrade)
- System Compatibility: Direct drop-in replacement in all existing Universal Relay F35 enclosures (UR Series hardware version 7.6x and higher)
- Supply Status: In Stock (current production, latest firmware 8.10 baseline)
- Warranty Standard: 12-month functional warranty, fully tested on live F35 relay with 100 % protection element verification
Key Technical Specifications
- Product Model: F35-CPU-UR-W-03
- Manufacturer: GE Grid Solutions
- System Platform: Universal Relay (UR) F35 Feeder Protection
- Processor: 32-bit ARM Cortex-A8 800 MHz + dedicated DSP co-processor
- Memory: 128 MB Flash + 256 MB DDR3 RAM
- Firmware Baseline: 8.10 (supports FlexLogic, IEC 61850 Ed.2, PRP/HSR, IEEE 1588 PTP)
- Communication Ports: 2 × rear 100Base-FX (fiber) or RJ45, 1 × front USB, IRIG-B, RS485
- Cyber Security: Role-Based Access Control, centralized authentication ready, Syslog, secure SSH/FTP
- Event Recorder: 10,000 events with 1 ms resolution
- Oscillography: Up to 64 samples/cycle, 128 records
- Operating Temperature: –40 °C to +85 °C (full performance)
- Certifications: IEC 61850-3, KEMA Type Tested, CE, UL, CSA, IEEE C37.90, IEC 60255
- MTBF: > 850,000 hours
- Hardware Revision: W-03 (latest UR CPU generation, introduced 2021)
Technical Architecture & Functional Positioning
The F35-CPU-UR-W-03 is the current top-tier CPU for the F35 platform. Compared to the older T-03/V-03 modules, it offers approximately 4× processing headroom, enabling simultaneous high-speed GOOSE messaging, complex FlexLogic equations, and full IEEE 1588 Precision Time Protocol synchronisation without performance degradation.
It is the only CPU revision that natively supports the newest cyber-security suite (NERC CIP compliance) and is required for firmware 8.00 and above. In the UR architecture it occupies the central processing slot and directly interfaces with all CT/VT modules, I/O cards, and communication switches.
Typical Application Scenarios
- Retrofit of legacy F35 relays to meet current NERC CIP cyber-security requirements
- New high-density distribution feeder protection with extensive IEC 61850 GOOSE peer-to-peer logic
- Substations requiring PRP/HSR parallel redundancy with zero recovery time
- Critical feeders with advanced fault recording and PMU (synchrophasor) capability
- Integration into modern digital substation architectures with process-bus 9-2LE
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