Product Core Brief
- Model: UR8HH
- Brand: GE Multilin (GE Vernova)
- Series: UR / URPlus Universal Relay — CT/VT Option Module
- Core Function: CT/VT input module for GE Multilin UR series relays, providing sensitive ground CT and phase CT inputs for protection and metering.
- Product Type: CT/VT (Current/Voltage Transformer) Input Module
- Key Specs: Sensitive ground CT input | Phase CT inputs (1A/5A) | Hot-swappable into UR relay chassis | Configurable via EnerVista UR software
- Condition: New Original (New Surplus) / Factory Sealed
Product Introduction
A UR relay without the right CT/VT module is just a processor with no eyes. The is the CT/VT input module that feeds current and voltage signals into a GE Multilin UR series relay, enabling differential, overcurrent, ground fault, and metering functions. It sits in the relay’s rear expansion slot and converts raw CT/VT secondary signals into digitized inputs the relay processor can act on.
Why this matters: if your UR relay’s CT/VT module fails or you’re adding sensitive ground protection to an existing installation, you need the right module code. The UR8HH is one of several CT/VT options — not interchangeable with UR8CH, UR8GH, or UR8NH without verifying your relay’s firmware and protection scheme. For plants still running UR relays with this module installed, a verified spare on the shelf means you replace the card during a planned outage, not during an unplanned trip.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Model | |
| Product Type | CT/VT Input Module |
| Compatible Platform | GE Multilin UR / URPlus Series Relays |
| CT Inputs | Phase CT (1A/5A) + Sensitive Ground CT |
| VT Inputs | Model-dependent (verify against relay order code) |
| Installation | Rear expansion slot (hot-swappable with relay powered, per UR manual) |
| Configuration | EnerVista UR / ViewPoint UR Engineer software |
| Diagnostics | CT/VT circuit health monitoring (firmware-dependent) |
| Operating Temperature | -40°C to +60°C (relay system dependent) |
| Mounting | DIN rail / panel mount (via UR relay chassis) |
Note: Exact channel count, accuracy class, and burden ratings depend on the specific UR relay model (G60, T60, F650, etc.) and firmware revision. Confirm against your relay’s order code and the GE Multilin UR manual before ordering.
Key Selling Points & Differentiators
- Correct module for sensitive ground protection. The UR8HH is specifically documented as providing sensitive ground CT capability alongside phase CT inputs — a confi
guration not all UR CT/VT modules support. - Hot-swappable. Can be replaced with the UR relay chassis energized, following proper UR relay procedures. No need to de-energize the entire panel.
- Configurable via EnerVista. Full CT/VT ratio, phase shift, and protection element settings accessible through GE’s EnerVista UR software suite.
- New surplus availability. These modules are legacy parts. We stock verified, unused units — not pulled modules with unknown service history.
- Not recommended for non-UR relay platforms. This module will not fit GE Mark VI/VIe turbine controls, AC800M I/O racks, or any non-UR chassis.
- 12-month warranty with pre-shipment visual inspection and pin verification.
Quality Transparency SOP
- Label & order code audit. Verify “UR8HH” marking on the module faceplate. Cross-check against known GE Multilin UR module labeling formats.
- Visual connector inspection. Check rear DIN 41612 connector pins for bending, corrosion, or missing pins — the most common failure point on pulled modules.
- PCB inspection. Check for burnt components, swollen capacitors, or rework traces under magnification. CT input sections get special attention.
- Pin continuity check. Verify connector pin-to-board continuity with a Fluke multimeter. Confirm no open circuits on critical signal paths.
- ESD packaging. Sealed in anti-static bag, foam-padded box, shipped with a signed inspection report.
Technical Risk Avoidance
- ❗ Verify firmware compatibility before installing. UR CT/VT modules require specific firmware revisions. Newer modules may not work on older relay firmware (and vice versa). Check your relay’s firmware version against GE’s compatibility matrix before swapping.
- ❗ CT secondary circuits must never be opened under load. When removing or inserting the UR8HH, ensure CT secondary circuits are shorted first. An open CT secondary can produce lethal voltages and damage the module.
- ❗ Not all UR CT/VT modules are interchangeable. UR8HH, UR8CH, UR8GH, and UR8NH have different CT/VT configurations. Installing the wrong module code will cause incorrect metering or protection element failures.
- ❗ Reconfigure CT ratios after replacement. Even a like-for-like swap may require verifying CT ratio, phase shift, and ground CT settings in EnerVista. Don’t assume the relay retains the correct settings.
Buyer’s FAQ
Q: Will this work in my G60/T60/F650 relay? A: The UR8HH is compatible with the GE Multilin UR series platform, which includes G60, T60, F650, and other UR/URPlus relays. However, firmware compatibility must be verified — check your relay’s current firmware revision against GE’s module compatibility documentation before ordering.
Q: Is this new or refurbished? A: New original surplus — factory sealed, never installed. We do not sell pulled or refurbished modules as “new.”
Q: Can I substitute UR8CH or UR8GH for UR8HH? A: Not without verifying your protection scheme. UR8CH, UR8GH, and UR8HH have different CT/VT configurations. UR8HH specifically provides sensitive ground CT capability. Swapping module codes may require reprogramming protection elements.
Q: Is this module hot-swappable? A: Yes — the UR series supports hot-swapping of rear modules with the relay chassis energized, following proper GE Multilin procedures. Always short CT secondaries before removal.
Q: What’s the lead time and warranty? A: In-stock units ship within 1–2 business days. 12-month warranty from ship date, covering manufacturing defects and DOA failures.
