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- UR8FH
Product Model: UR8FH (UR-8FH)
Product Brand: GE Multilin
Product Series: UR (Universal Relay) Series
Product Features:
- CT/VT module providing current and voltage scaling inputs to UR relays
- Accommodates three phase CTs, one ground CT, and up to four VT connections
- Integrates seamlessly into the modular UR relay chassis
- Factory-supported, 12-month warranty available
| Specification | Detail |
|---|---|
| Model | GE UR8FH (UR-8FH) |
| Brand / Series | GE Multilin / UR (Universal Relay) Series |
| Module Type | CT/VT Input Module |
| CT Inputs | 3 phase CTs (1A / 5A rating) |
| Ground CT Input | 1 (residual) CT, also 1A / 5A |
| VT (Voltage Transformer) Inputs | 4 voltage inputs / terminals |
| Compatibility | UR-series relay chassis and CPUs |
| Physical Dimensions | ~ 15 cm × 18 cm × 4 cm (approx) |
| Weight | ~2 lb 9 oz (approx) |
| Warranty | 12 months (typical from vendors) |
| Terminations | CT/VT terminal blocks or connectors compatible with UR relay I/O backplane |
| Environmental | Suitable for enclosure ambient conditions; designed for industrial relay environments |
Applications & Industry Context
Modern protection and control systems within substations or heavy industrial plants require accurate and reliable sensing of currents and voltages, feeding derivative logic and protection algorithms. The GE UR8FH module plays a critical role in this architecture, acting as the CT/VT interface card for GE’s Multilin universal relay (UR) family.
This module is often found in relay panels protecting transformers, feeders, generators, or motor circuits. It scales high-current CT and high-voltage signals down to levels the UR relay CPU can safely monitor and act upon. Without this CT/VT module, the relay would have no direct measurement of system currents or voltages and thus no real protection capability.
System integrators and substations frequently upgrade legacy protection systems by replacing older CT/VT modules with UR8FH, allowing newer UR relay CPUs to be retrofitted into existing relay racks. The modular UR platform ensures minimal rewiring, leveraging the UR8FH to maintain continuity of measurement while improving overall system capabilities.
Because the UR relay family is modular, the GE UR8FH can be swapped or upgraded with minimal impact on adjacent protection modules, making maintenance and expansion more manageable in mission-critical environments.
Product Role & System Fit
The GE UR8FH is not a relay by itself. Its purpose is to supply measurement data to a UR relay controller—specifically current and voltage signals—via CT and VT input scaling. It forms the physical interface between the high-power system and the internal relay logic.
In a UR relay enclosure, the UR8FH occupies one of the modular slots (often in the front I/O area), alongside CPU modules, digital I/O modules, communication modules, and others. The CT/VT module must be matched to the CPU’s generation and firmware version to ensure compatibility.
When a fault, trip, or alarm is triggered, the CPU relay logic references data from the UR8FH input module to decide on protective actions (trip breaker, alarm, log event). Because that data must be trustworthy, the UR8FH is engineered to maintain accurate scaling and stable behavior under normal and fault conditions.
In many UR-based systems, the UR8FH is essential to enabling protective functions such as overcurrent, directional fault, motor protection, voltage monitoring, and more. Without it, the relay becomes blind to the system’s actual status.
