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GE Multilin UR8RH UR-8RH Universal Relay Chassis

Configured for modular protection relay hardware integration in GE Multilin Universal Relay platforms, the GE Multilin UR8RH (UR8RH Universal Relay Chassis) provides direct physical and electrical execution for relay module housing, power distribution, and rear-terminal signal connection.

Hardware Specifications

Parameter	Specification
Model	GE Multilin UR8RH
Brand	GE Multilin
Weight	0.22 kg
Dimensions	3.8 cm x 11.5 cm x 4.5 cm
Operating Temp	-40 deg C to +60 deg C
Power Consumption	Typical 15-35 W depending on installed modules
Series	Universal Relay (UR) Series
Chassis Capacity	8-slot modular chassis
Form Factor	4U 19-inch rack mount / panel mount
Power Input	110-250 VDC / 110-230 VAC
Communication Interfaces	Ethernet, RS232, RS485
Supported Protocols	IEC 61850, DNP 3.0, Modbus RTU/TCP, IEC 60870-5-103/104

Profinet / EtherNet-IP Deterministic Networks and I/O Architecture

The GE Multilin UR8RH chassis provides the physical platform for modular UR Series relay assemblies, supporting configurable combinations of CPU, power supply, CT/PT input, digital I/O, and communication modules. The 8-slot backplane architecture allows I/O density scaling through module selection while maintaining fixed mechanical alignment and rear-terminal wiring access.

The UR platform processes protection and control data through high-speed internal module communication. Installed communication modules support Ethernet-based network integration, including IEC 61850 messaging with GOOSE and Sampled Values, as well as serial SCADA protocols through RS232 and RS485 interfaces.

The Type H power supply configuration accepts 110-250 VDC or 110-230 VAC input and provides internal relay module power distribution. The supply design includes voltage ride-through capability at nominal input conditions and supports firmware-compatible module replacement within the UR hardware family.

Frequently Asked Questions (FAQ)

Q: What modules can be installed in the UR8RH chassis?
A: The UR8RH chassis supports modular UR Series assemblies including CPU modules, power supply modules, CT/PT input modules, digital I/O modules, and communication modules.

Q: Does the UR8RH support hot-swapping of installed modules?
A: Module replacement procedures depend on the specific UR Series module type and system configuration. Power isolation and manufacturer-defined replacement procedures should be followed before removing installed hardware.

Q: Which communication protocols are available through the UR8RH platform?
A: Supported communication depends on installed option modules and includes IEC 61850, DNP 3.0, Modbus RTU/TCP, IEC 60870-5-103/104, and time synchronization interfaces such as IRIG-B and IEEE 1588 PTP.

Field Installation Guidelines

• Install the UR8RH chassis in a compatible 19-inch rack or panel enclosure with adequate mechanical support.
• Verify rear-terminal wiring orientation before connecting CT/PT circuits, digital signals, and communication cables.
• Maintain separation between power wiring, instrument signal wiring, and communication cables to reduce electrical interference.
• Connect shielded communication cable shields according to site grounding practices and applicable protection system requirements.
• Confirm input voltage range before energizing the Type H power supply configuration.
• Ensure all installed modules are fully seated in the chassis slots before system startup.
• Follow GE Multilin UR Series configuration procedures when replacing or adding modules.

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