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GE Multilin UR8LM UR-8LM CT/VT Analog Input Module

Configured for analog current and voltage acquisition in the GE Multilin Universal Relay (UR) Series protection platform, the GE Multilin UR8LM (UR8LM CT/VT Analog Input Module) provides direct physical and electrical signal conversion from CT and VT circuits into the relay processing system.

Hardware Specifications

Parameter	Specification
Model	UR8LM
Brand	GE Multilin / General Electric
Weight	350 g
Operating Temp	-40 deg C to +70 deg C
Power Consumption	24 VDC internal logic supply
Series	Universal Relay (UR) Series
Module Type	CT/VT Analog Input Module
Input Configuration	4 CT inputs + 4 VT inputs
Supported Protocols	Modbus RTU/TCP, DNP 3.0, IEC 61850, TCP/IP via host UR chassis
Installation Method	Plug-in module for GE Multilin UR chassis slots

Backplane Bus Communication and Firmware Flash Compatibility

The UR8LM operates as an analog acquisition module within the GE Multilin UR hardware architecture. The module exchanges processed measurement data through the UR chassis backplane interface and maintains compatibility with the host relay firmware environment. The modular design supports I/O density scaling through chassis-based hardware configuration and allows integration with UR protection functions including differential, distance, overcurrent, and voltage measurement applications.

Frequently Asked Questions

Q: What signal types are accepted by the UR8LM module?
A: The UR8LM accepts analog electrical inputs from 4 CT channels and 4 VT channels for current and voltage measurement processing within the host UR relay.

Q: Can the UR8LM operate as a standalone protection device?
A: No. The UR8LM is an input module designed for installation in a GE Multilin Universal Relay chassis and requires a compatible UR host device for processing and communication functions.

Q: What environmental conditions are specified for UR8LM operation?
A: The specified operating temperature range is -40 deg C to +70 deg C. Additional environmental parameters depend on the complete UR relay system installation.

Field Installation Guidelines

Install the UR8LM only in compatible GE Multilin Universal Relay chassis positions. Verify module seating, chassis backplane contact alignment, and connector engagement before applying power.

Use appropriate shielded wiring practices for CT and VT signal connections. Maintain separation between analog measurement wiring and high-current switching conductors to reduce electromagnetic interference.

Confirm CT secondary circuit conditions before removal or installation procedures. Follow site protection procedures for energized current transformer circuits.

Verify host relay configuration, firmware compatibility, and communication settings after module installation. Validate analog channel assignments through the relay configuration interface before placing the protection system into service.

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