Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | UR-RHH / URRHH |
| Manufacturer | GE Multilin |
| Series | UR Series Universal Relays |
| Product Type | Power Supply Module |
| Voltage Range | 125–250 V nominal DC |
| AC Input Range | 100–240 VAC |
| Power Rating | 35 W DC / 35 VA AC |
| Internal Fuse | 4 A / 250 V |
| Redundant Power | Supported depending on relay configuration |
| Relay Interface | Internal UR relay power architecture |
| Contact Input Supply | Can supply power for dry-contact input circuits |
| Diagnostics | Relay self-test monitors power-supply condition |
| Status Indication | UR front-panel LED indications |
| Typical Application | GE Multilin protection and control relays |
The UR-RHH is specifically identified as a power supply module for GE Multilin Universal Relays. It is the high-voltage RH/RHH family, rather than a CPU, communications, CT/VT, or digital I/O module.
One important distinction is that RH/RHH is an ordering designation associated with the redundant/high-voltage power-supply architecture. GE’s later product documentation explains that newer SH/TH designs can exist inside relays that retain RH ordering references for compatibility and procurement purposes.
Product Introduction
The GE UR-RHH / URRHH is a high-voltage power supply module used in the GE Multilin Universal Relay platform. Its job is straightforward but critical: convert the relay’s incoming control power into the internal power rails required by the protection relay and, where applicable, provide power for dry-contact input circuits. The RH high-voltage version supports 125–250 V nominal DC and 100–240 VAC, with a 35 W DC or 35 VA AC rating.
For plant maintenance, this is not a module to select by voltage rating alone. The installed UR relay model, power-supply generation, redundant/non-redundant configuration, and exact module identification should all be checked. GE has subsequently redesigned the UR high-voltage supply architecture, so a newer replacement may carry different internal hardware while retaining an RH-related ordering designation.
URRHH
Application Scenarios & Field Pitfalls
Engineering Pain Point
When a GE Multilin UR relay fails to power up, technicians sometimes replace the entire relay before checking the removable power-supply module. With an UR-RHH, the power module itself can be the failed component. The UR platform also performs internal power-supply diagnostics, so relay status indications can provide useful evidence during troubleshooting.
Typical Applications
- Transformer protection: Power supply for UR-series transformer management relays such as the T60.
- Motor protection: Used within UR-series motor protection systems where the RH high-voltage supply configuration is specified.
- Generator and feeder protection: Supports Universal Relay protection platforms installed in substations and plant switchgear.
- Industrial power distribution: Maintains the control power source for UR relay electronics and associated contact-input circuits.
Technical Pitfalls to Avoid
- Do not confuse UR-RHH with the low-voltage UR-RLH. The RH/RHH family is the high-voltage version; low-range UR supplies use a different module designation.
- Verify AC/DC requirements before installation. The high-range module supports 125–250 V nominal DC and 100–240 VAC, but the exact relay configuration and ordering code still need to be checked.
- Check whether the relay uses redundant power. RH-related ordering can be associated with redundant power configurations, and later GE designs may use SH or TH hardware while retaining an RH ordering reference.
- Do not assume every UR-RHH listing has the same internal assembly. A commonly cited assembly/P/N is 12A0-0101-B4, but the complete relay nameplate and module label should be used to confirm the exact hardware before procurement.
Related Products
- UR-RHV — Another GE Multilin UR-series power-supply module; verify voltage range and relay-generation compatibility before substitution.
- UR-RLH — Low-voltage UR power-supply family, intended for 24–48 V nominal DC applications rather than the high-voltage RH range.
- UR-SHA — Later-generation high-voltage UR power-supply design; GE identifies SH as an equivalent successor family to RH in the redesigned architecture.
- UR-SL — Later low-voltage power-supply design corresponding to the RL family.
- UR-TH — Newer high-voltage UR power-supply design introduced by GE; GE states that some previous RH/SH modules can be directly replaced by the new TH design under specified conditions.
- UR-9NH — UR-series CPU/communications module; performs a completely different function from UR-RHH.
- UR-8NH — UR-series CT/VT input module used for protection measurements; not a power-supply substitute.
- UR-6NH / UR-6UH — UR-series digital I/O modules with different functions from the UR-RHH power supply.
Procurement Check
For GE UR-RHH / URRHH, the minimum procurement verification should be UR-RHH designation + complete relay model + module nameplate/P/N + input power range + redundant-power configuration.
If the existing module is marked P/N 12A0-0101-B4, retain that information in the purchasing record rather than relying on “URRHH” alone. More importantly, check whether the installed relay has subsequently been migrated to the SH/TH generation, because GE’s documentation confirms that the internal power-supply design has evolved while certain RH ordering references have been retained.
