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GE Multilin UR9CH Universal Relay Chassis Module

Configured for modular protection hardware integration in GE Multilin Universal Relay platforms, the GE Multilin UR9CH (UR9CH Universal Relay Chassis Module) provides the mechanical and electrical infrastructure for housing protection, control, communication, and I/O modules. The chassis supports module backplane connections, power distribution, and deterministic inter-module data exchange within UR series relay systems.

Hardware Specifications

Parameter	Specification
Model	UR9CH
Brand	GE Multilin
Weight	1 lb
Dimensions	6.5 in L x 6 in W x 2.5 in H
Operating Temp	-40 deg C to +60 deg C
Power Consumption	25 W to 45 W typical, depending on installed modules
Series	Universal Relay (UR) Series
Form Factor	19-inch rack mount, 9U height
Module Capacity	Up to 16 vertical module slots
Mounting Options	Rack mount, panel mount, surface mount
Power Supply Compatibility	88-300 VDC / 88-265 VAC high range; 24-48 VDC low range
Protection Rating	IP40 front panel, IP20 rear terminals
Supported Modules	CPU, CT/VT input, Digital I/O, communication cards, Ethernet interfaces

Deterministic Backplane Communication and Firmware Compatibility

The UR9CH chassis uses the Universal Relay internal backplane architecture to provide module-to-module communication and power distribution between installed functional cards. The backplane supports deterministic data transfer for protection logic execution, event timestamp synchronization, and coordinated operation between CPU, input, output, and communication modules.

Industrial control compatibility depends on installed relay firmware and module combinations. Firmware flash compatibility must be verified between the chassis configuration, CPU module, communication cards, and protection application modules before system commissioning.

Frequently Asked Questions

Q: Does the UR9CH support hot-swappable modules?
A: The chassis supports redundant hot-swappable power supply configurations. Module replacement procedures depend on the installed relay hardware configuration and approved maintenance procedures.

Q: How many functional modules can be installed in the UR9CH chassis?
A: The chassis provides up to 16 vertical module slots, with the final capacity determined by the installed backplane and relay configuration.

Q: What power supply ranges are supported by the UR9CH platform?
A: The chassis supports high-range power inputs of 88-300 VDC or 88-265 VAC and low-range power inputs of 24-48 VDC through compatible power supply modules.

Field Installation Guidelines

Install the UR9CH chassis in a compatible 19-inch protection rack or approved panel mounting structure. Verify mechanical alignment of module guides and backplane connectors before inserting functional cards.

Maintain proper separation between power wiring, CT/VT signal wiring, communication cables, and low-level I/O conductors. Use shielded communication cables where required and terminate cable shields according to the grounding design of the protection panel.

Confirm chassis grounding continuity before energizing the system. Inspect rear terminal connections, power supply module seating, and communication interface installation prior to relay configuration loading.

For replacement or expansion activities, remove power according to site maintenance procedures before accessing chassis modules. Confirm firmware compatibility between CPU, communication modules, and installed protection cards before restoring operation.

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