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GE Multilin UR8MH UR-8MH Universal Relay Chassis

The GE Multilin UR8MH, also cataloged as the UR8MH Universal Relay Chassis, operates as a dedicated hardware component for modular protection device integration within the GE Universal Relay (UR) Series platform. The chassis provides physical mounting, backplane connectivity, and power distribution for UR-series protection modules.

Hardware Specifications

Parameter	Specification
Model	UR8MH
Brand	GE Grid Solutions / GE Multilin
Weight	2.55 lbs
Dimensions	6 in L x 7 in W x 1.5 in H
Operating Temp	-40 deg C to +60 deg C
Power Consumption	Typically 15 - 40 W, configuration dependent, maximum approx. 75 W
Series	Universal Relay (UR) Series
Form Factor	8U height, 19-inch rack / panel mount, horizontal orientation
Architecture	Modular backplane chassis with field-replaceable module support
Power Supply Options	110 - 250 VDC / 110 - 230 VAC or 24 - 48 VDC
Protection Class	IP50 front panel, IP20 rear terminals
Dielectric Withstand	IEC 60255-5 / IEEE C37.90 compliant

Deterministic Network and Backplane Architecture

The GE Multilin UR8MH chassis uses a modular backplane structure to provide communication and power interfaces between Universal Relay modules. The architecture supports installation of CT/VT input modules, digital I/O cards, communication assemblies, and power supply modules according to the selected UR protection application.

The chassis design supports hot-swappable and field-replaceable module configurations where permitted by the installed UR device architecture. Backplane communication velocity and module compatibility are determined by the installed firmware and UR hardware configuration.

The UR8MH platform supports GE UR-series devices including protection, control, and monitoring assemblies such as C70, T60, L90, D60, and B30 configurations.

Frequently Asked Questions

Q: Does the UR8MH support redundant power supply installation?
A: Yes. The chassis supports dual independent power supply modules when configured with compatible UR-series power assemblies. Redundant operation depends on the installed protection system configuration.

Q: Can UR8MH modules be replaced during operation?
A: The chassis supports field-replaceable module architecture. Hot-swap capability depends on the specific module type and operating conditions defined by the UR platform documentation.

Q: What communication interfaces are available through the UR8MH chassis?
A: Communication availability depends on the installed UR-series communication modules. The chassis provides the mechanical and backplane infrastructure required for compatible communication assemblies.

Field Installation Guidelines

Install the UR8MH chassis in a protected control cabinet or relay panel with adequate clearance for module insertion, rear terminal access, and ventilation.

Verify rack mounting alignment before securing the chassis to prevent mechanical stress on the backplane connectors. Install power supply modules and I/O assemblies according to the approved UR hardware arrangement.

Use shielded wiring practices for low-level signal circuits. Terminate cable shields according to the grounding design of the protection panel to reduce electrical noise coupling.

Separate CT/VT wiring, communication cables, and high-voltage power conductors to minimize electromagnetic interference. Confirm terminal tightness, protective grounding continuity, and correct module seating before energizing the relay assembly.

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