Description
Product Introduction
Protection relays depend on a correctly matched power supply to maintain relay operation and provide the required voltage for field contact inputs. The GE Multilin URSHA is a power supply module in the Universal Relays family, intended for compatible protection relay installations that require the higher-voltage supply configuration.
For maintenance and procurement teams, the main selection criteria are the installed relay model, input power source, mounting arrangement, and dry-contact input requirements. Verify these details against the relay’s hardware manual before ordering or replacing the module.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model | URSHA / UR-SHA |
| Manufacturer | GE Multilin |
| Product family | Universal Relays (UR Series) |
| Module type | Relay power supply |
| Generation | UR-SH generation |
| Nominal input class | 125–250 V AC/DC |
| AC input range | 85–265 VAC reported in product documentation; verify applicable manual |
| DC input range | High-voltage DC supply; verify exact permitted range on the unit documentation |
| Output power | 45 W reported |
| Dry-contact input supply | 48 VDC |
| Overtemperature protection | Automatic shutdown at approximately 105°C reported |
| Isolation voltage | 2300 VAC reported |
| Diagnostics | Relay system diagnostics and front-panel status indication |
| Mounting | Horizontal 19-inch rack configuration |
| Environmental coating | Harsh-environment coating reported for the “A” variant |
| Operating temperature | Some catalogs report −25°C to +60°C; confirm the applicable hardware manual |
| Dimensions and weight | Verify against the exact hardware revision |
Specification caution: Some reseller descriptions mix nominal voltage classes with actual input ranges. Use the GE Multilin UR Series manual and the module’s nameplate as the authority for input voltage and installation requirements.
URSHA
Application Scenarios and Pain Points
A protection relay with an unsuitable or failing power supply can produce startup failures, diagnostic alarms, or loss of field-contact input power.
- Substation protection: Supply power to compatible UR-series feeder, transformer, generator, or line protection relays.
- Industrial power distribution: Maintain relay operation in switchgear and breaker protection systems.
- Legacy relay maintenance: Replace a failed power module without unnecessarily changing the full protection relay, when an approved replacement is available.
- Maintenance planning: Identify the correct supply range and mounting variant before a scheduled outage.
Field note: A relay that powers up does not automatically prove that its dry-contact circuits receive the correct supply. Verify the relevant input circuits and relay diagnostics during commissioning.
Related Products
| Model | Relationship |
|---|---|
| URSHB | Related UR-SH power supply variant; confirm supply range and mounting arrangement before substitution. |
| UR-1H | Earlier-generation UR power supply identified in product references as a predecessor. Confirm approved replacement guidance. |
| UR-RH | Earlier-generation UR power supply also referenced as a predecessor to UR-SH. |
| UR-6CH | Example of a UR-series relay model; verify the exact relay hardware and power supply requirements. |
| UR-7H series | Related Universal Relay family; compatibility must be checked against the specific relay model and manual. |
The predecessor relationships are reported in product documentation, but they do not replace a model-specific compatibility check.
Engineer’s Guide: Three Checks Before Replacement
- Confirm the input power class. Check whether the installation uses high-voltage AC or DC and verify the permitted input range from the applicable manual. Do not select a low-voltage variant based on physical similarity.
- Check the relay and mounting configuration. Confirm the exact UR relay model, power-supply slot, rear connector, and rack orientation. Verify the complete suffix and environmental coating requirements.
- Validate the complete supply function. Follow site isolation procedures before removal. After installation, check relay diagnostics, supply status indicators, and the 48 VDC dry-contact supply where applicable.
Frequently Asked Questions
Q1. What is the GE Multilin URSHA?
It is a power supply module for compatible GE Multilin Universal Relays used in electrical protection systems.
Q2. What is its nominal input voltage?
Catalog references identify it as a 125–250 V nominal supply variant. Confirm the permitted AC and DC input ranges in the manual for the exact module.
Q3. Does URSHA provide 48 VDC?
Product documentation identifies a 48 VDC supply for dry-contact input circuits. Confirm the required wiring and input configuration for the installed relay.
Q4. Is URSHA interchangeable with URSHB?
Do not assume interchangeability. The variants may differ in supply range or physical configuration. Check the part number, relay model, and approved replacement documentation.
Q5. What is the output power rating?
The UR-SH generation is listed at 45 W, compared with 35 W reported for earlier generations. Verify the rating against the applicable manufacturer documentation.
Q6. What should I request when purchasing a used or refurbished URSHA?
Request a clear nameplate photograph, hardware revision, inspection results, power-on and functional test evidence, and written warranty terms. Confirm that the supply was tested with an appropriate compatible setup.
Q7. What information is needed to confirm compatibility?
Provide the complete URSHA label, the installed relay model, the available AC/DC supply voltage, and the relay hardware manual or wiring diagram. This information helps establish whether the module matches the installation.
Procurement recommendation: Treat URSHA as a relay-specific power supply rather than a generic industrial DC supply. Verify the input class, dry-contact supply requirements, mounting variant, and relay compatibility before purchase.
