+86 13313703791
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seren@ymgkplc.com
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GE UR8FH | Multilin UR Series CT/VT Module
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Configuration | Standard 4CT / 4VT |
| Phase CT Inputs | 3 × 1 A / 5 A dual-rated |
| Ground CT Input | 1 × 1 A / 5 A dual-rated |
| Voltage Transformer Terminals | 4 |
| Sensitive Ground Feature | Not included |
| Form Factor | Plug-in module for UR chassis |
| Approximate Dimensions | 15 cm L × 18 cm W × 4 cm H |
| Approximate Weight | 2 lb 9 oz (≈ 1.16 kg) |
| Compatibility | UR family relays (B30, C60, D60, F35, G60, L90, M60, etc.) |
| Manufacturing Origin | Markham, Ontario, Canada |
4. Product Introduction (Anti-Template)
When a main CPU trips and downtime costs thousands per minute, accurate current and voltage data becomes the first line of defense. The UR8FH feeds the Universal Relay processor with scaled signals from three phase CTs, one ground CT, and four voltage terminals so protection elements can operate on clean, usable values.
Unlike modules equipped with sensitive-ground inputs, this standard 4CT/4VT version suits conventional grounded systems. It plugs directly into the UR chassis, converts high-side currents and voltages without extra transducers, and supplies the metering and protection functions that keep generators, transformers, feeders, and motors online. Field wiring lands on the module terminals; the relay does the rest.
5. QC, Procurement & Logistics SOP
- Inbound Verification – Origin is confirmed against Multilin manufacturing records. Module faceplate markings, CT/VT labeling, and physical condition are photographed and logged before any handling.
- Live Rig Testing – Unit is inserted into a compatible UR chassis, powered, and checked for proper channel recognition, CT ratio response, and VT signal integrity against known reference inputs.
- QA & Anti-Static Packaging – After functional pass, contacts are inspected, the module is cleaned, and it is sealed in anti-static shielding with desiccant and humidity indicator.
- Global Logistics & Export Compliance – Classified under the correct HS code for protective-relay accessories. Packaging is rated for air and sea freight vibration; export documentation is prepared to minimize customs delays.
GE UR8FH | Multilin UR Series CT/VT Module
6. Technical Pitfalls & Integration Warnings
Firmware / Hardware Mismatch – Pairing a newer enhanced-diagnostics CT/VT module with an older CPU can trigger hardware mismatch faults. The UR8FH itself is the standard (non-enhanced) version; confirm the host relay firmware supports the installed module generation before energizing.
Wiring / Terminal Errors – Incorrect CT polarity or open secondary circuits can produce false residual current and unwanted trips. Always short CT secondaries before disconnecting and verify polarity against the UR manual drawings.
Sensitive-Ground Confusion – Installing the UR8FH on a high-impedance grounded system that actually needs the sensitive-ground feature (UR-8G/8J/8M/8R) leaves the relay blind to low-level ground faults. Match the module order code to the system grounding method.
ESD or Mechanical Damage During Handling – The analog input channels are sensitive. Dropping the module or handling it without proper grounding can degrade measurement accuracy even if the unit still powers up.
7. Frequently Asked Questions (FAQ)
What is the realistic global lead time for a verified UR8FH?
Stock units typically ship within 1–3 business days after payment clearance. Air freight to major industrial regions usually adds 3–8 days once customs processing is complete.
Does the UR8FH include the sensitive-ground input?
No. It is the standard 4CT/4VT configuration. Sensitive-ground versions carry different order codes (UR-8G, UR-8J, UR-8M, UR-8R).
Can this module be hot-swapped while the relay is powered?
Follow the specific UR chassis guidelines. In most cases power should be removed or the module handled according to the manufacturer’s hot-swap procedure to avoid channel errors or damage.
Which UR relays accept the UR8FH?
It is compatible with the broader Multilin Universal Relay family, including bus, feeder, generator, motor, transformer, and line-protection models that accept CT/VT modules.
What CT ratios does it support?
Phase and ground CTs are dual-rated 1 A / 5 A. Actual primary ratios are set in the relay configuration software.
Is any special firmware required?
Standard UR firmware that supports the basic CT/VT module generation is sufficient. Enhanced-diagnostics modules require firmware 5.20 or later; the UR8FH does not fall into that category.
How should CT secondaries be handled during replacement?
Always short the CT secondaries before disconnecting the module. Open-circuit secondaries can generate hazardous voltages and damage the module or connected equipment.
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