GE UR8LH – 2 Form A & 2 Form C Relay Output Module | UR Series Platform
Engineering Background
The GE UR8LH is a plug-in output module designed for the GE Multilin Universal Relay (UR) platform — one of the most widely deployed digital protection and control architectures in transmission, distribution, and industrial power systems. The UR platform’s modular slot-based architecture allows engineers to configure relay I/O precisely to application requirements without over-specifying hardware. The UR8LH occupies a standard UR rear-panel slot and delivers four relay output contacts in a mixed configuration: two Form A (normally open) and two Form C (changeover) contacts, providing maximum flexibility for trip, alarm, and control circuit wiring.
Product Positioning
Targeted at protection engineers, substation automation integrators, and MRO procurement teams, the UR8LH is the preferred output module when applications require both latching-capable NO contacts and changeover contacts within a single slot. It is a direct factory-compatible replacement for installed UR-platform relays including the C60, C70, D60, F35, F60, G60, L90, M60, T60, and related models.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | UR8LH |
| Manufacturer | GE Multilin (General Electric) |
| Platform | UR Series (Universal Relay) |
| Module Type | Relay Output Module |
| Output Configuration | 2 × Form A (SPST-NO) + 2 × Form C (SPDT) |
| Total Output Contacts | 4 |
| Contact Rating (Resistive) | 8 A @ 250 VAC / 30 VDC |
| Contact Rating (Inductive) | Per IEC 60255-23 Class III |
| Minimum Switching Load | 10 mA @ 5 VDC |
| Dielectric Strength | 2000 VAC (contact to coil) |
| Operate Time | < 8 ms typical |
| Mechanical Life | ≥ 10,000,000 operations |
| Electrical Life | ≥ 100,000 operations at rated load |
| Module Weight | ~1200 g (with housing) |
| Operating Temperature | −40°C to +85°C |
| Storage Temperature | −40°C to +85°C |
| Humidity | 5% to 95% RH, non-condensing |
| Vibration | IEC 60255-21-1 Class II |
| Seismic | IEEE 693 Moderate Level |
| EMC Compliance | IEC 61000-4 series; IEEE C37.90.1/C37.90.2 |
| Safety Standards | UL 508, CSA C22.2 No. 14 |
| Slot Compatibility | UR Series standard rear-panel I/O slot |
| Country of Origin | Canada / USA |
Proven Application Environments
- Transmission Line Protection: Trip and reclose output circuits on C60/C70/L90 line differential relays
- Transformer Protection: Dual-winding trip outputs on T60 transformer protection relays
- Generator Protection: Field breaker trip and alarm outputs on G60 generator protection relays
- Feeder Protection: Sectionalizer and recloser control on F35/F60 feeder protection relays
- Bus Protection: Zone trip outputs on B30/B90 bus differential relays
- Motor Protection: Contactor trip and alarm on M60 motor protection relays
- SCADA Integration: Status output contacts for RTU/IED digital input acquisition
- Industrial Power: MCC and switchgear protection in oil & gas, mining, and utility applications
Engineering Advantages
- Mixed Contact Configuration: 2 Form A + 2 Form C in one slot eliminates the need for two separate output modules in mixed-circuit applications
- High Interrupt Rating: Rated for inductive trip coil loads — no external interposing relay required in most 125 VDC trip circuits
- Hot-Swap Compatible: UR platform supports module replacement without full relay de-energization (verify with site safety procedures)
- Firmware Transparent: Module identity is auto-detected by UR firmware; no re-configuration required after replacement
- Long Service Life: ≥10M mechanical operations ensures multi-decade service in low-cycle protection applications
- Wide Temperature Range: Qualified to −40°C, suitable for outdoor switchgear and arctic substation environments
- IEC & IEEE Dual Compliance: Meets both international and North American protection relay standards
System Architecture & Signal Flow
Within the UR platform, the UR8LH interfaces directly with the relay’s internal logic bus via the rear-panel slot connector. Output contact assignments are mapped in the UR’s FlexLogic™ equation editor — each of the four contacts can be independently assigned to any virtual output bit, protection element pickup/operate, or user-defined logic gate. Signal flow is:
Protection Element → FlexLogic™ Operand → Output Contact Assignment → UR8LH Physical Contact → External Trip/Alarm Circuit
Form A contacts are typically assigned to trip coil circuits (high-current, inductive loads). Form C contacts are preferred for alarm annunciator panels and SCADA digital inputs where both NO and NC states must be monitored. The module draws operating power from the UR chassis backplane; no external auxiliary supply is required.
Sourcing & Quality Verification
- Source: Konmask.com sources UR8LH modules from authorized GE Multilin channel partners, certified MRO distributors, and decommissioned utility-grade equipment with documented service history
- Inspection: Each unit undergoes visual inspection, connector integrity check, and label/firmware version verification prior to listing
- Condition Grades: New-in-box (NIB), Refurbished-to-spec (RTS), and Tested-used (TU) — condition grade is stated explicitly in the order confirmation
- Traceability: Serial number and firmware version recorded for all units; available on request for IEC 61850 / utility asset management compliance
- Warranty: 12-month replacement warranty against manufacturing defects and contact failure under rated load conditions
Procurement Process
- Confirm Compatibility: Verify your UR relay model and firmware version support the UR8LH slot assignment (refer to GE Multilin UR Hardware Manual, Chapter 2)
- Request Quote: Contact support@konmask.com with quantity, required condition grade, and delivery timeline
- Order Confirmation: Receive proforma invoice with serial number, condition grade, and lead time within 1 business day
- Payment & Export: T/T, L/C, and PayPal accepted; export documentation (CO, packing list, commercial invoice) provided for international shipments
- Shipping: DHL Express / FedEx International Priority standard; sea freight available for bulk orders ≥5 units
- Incoming Inspection: Recommended: verify firmware version via UR EnerVista software before installation
Technical FAQ
Q: Is the UR8LH compatible with all UR-platform relays?
A: Yes — the UR8LH is compatible with all UR-series relays that support standard output module slots, including C60, C70, D60, F35, F60, G60, L90, M60, T60, B30, and B90. Confirm slot availability in your relay’s hardware configuration.
Q: Can Form A contacts be used for 125 VDC trip coil circuits?
A: Yes. The Form A contacts are rated for inductive loads per IEC 60255-23 Class III, making them suitable for direct connection to 125 VDC trip coils without interposing relays in most standard applications.
Q: What is the difference between UR8LH and UR8NH?
A: The UR8NH provides 4 × Form C outputs (all changeover), while the UR8LH provides 2 × Form A + 2 × Form C. Choose UR8LH when you need dedicated NO contacts for trip circuits alongside changeover contacts for alarm/SCADA outputs.
Q: Does replacing the UR8LH require relay re-commissioning?
A: No. The UR firmware auto-detects the module type. However, you must verify that the FlexLogic™ output assignments in the relay settings file match the physical contact wiring after replacement.
Q: What firmware version is required?
A: The UR8LH is supported from UR firmware v3.00 onwards. Konmask provides the firmware version of each unit on request.
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