Description

GE Multilin UR4LH UR-4LH Universal Relay 4U Horizontal Chassis

Configured for modular protection, control, and monitoring execution in GE Multilin Universal Relay platforms, the GE Multilin UR4LH (UR4LH Universal Relay Chassis) provides direct physical and electrical support for plug-in relay modules, signal interfaces, and communication assemblies.

Hardware Specifications

Parameter	Specification
Model	UR4LH
Brand	GE Multilin
Weight	2.55 lbs
Dimensions	15 cm L x 18 cm W x 4 cm H
Operating Temp	-40 deg C to +60 deg C
Power Consumption	Typical 15-35 W, dependent on installed modules and active I/O
Form Factor	19-inch rack mount / panel mount
Chassis Height	4U (7.0 inches / 177.8 mm)
Mounting Orientation	Horizontal
Enclosure Rating	IP40 front panel when panel mounted; IP20 rear terminals
Construction	Aluminum chassis with modular card-slot architecture
Control Power Input	110-250 VDC / 110-240 VAC (50/60 Hz) or 24-48 VDC
Ethernet Interface	Redundant 10/100Base-T RJ45 or 100Base-FX fiber optic
Supported Protocols	IEC 61850 Ed. 1 / Ed. 2, DNP 3.0, Modbus RTU, Modbus TCP/IP, IEC 60870-5-104, IEC 60870-5-103
Time Synchronization	IEEE 1588 PTP, IRIG-B, SNTP
Configuration Software	EnerVista UR

Deterministic Network and I/O Architecture

The UR4LH chassis uses a modular slot structure for integration of CPU and communication modules, power supply modules, CT/VT input modules, digital I/O modules, transducer modules, and communication expansion cards. The architecture supports Profinet / EtherNet-IP style deterministic network concepts through dedicated industrial communication design practices, while the Universal Relay platform provides scalable I/O density according to installed hardware modules.

The chassis provides physical support for relay processing assemblies and signal acquisition modules. Module selection determines available protection functions, measurement channels, digital control points, and communication interfaces.

Frequently Asked Questions

Q: Does the UR4LH chassis support hot-swapping of installed relay modules?
A: The provided data does not specify hot-swap capability. Module replacement should follow GE Multilin maintenance procedures and system shutdown requirements.

Q: What is the expected backplane loading condition for installed modules?
A: Backplane power loading depends on the installed module combination. The specified system power consumption range is typically 15-35 W.

Q: Which interfaces are available for local configuration?
A: The front panel provides an LCD interface, programmable LEDs, status indicators, and RS232 / USB communication ports for PC configuration using EnerVista UR software.

Field Installation Guidelines

Install the UR4LH chassis in a compatible 19-inch rack or panel mounting structure with adequate mechanical support. Maintain separation between low-level signal wiring, CT/VT circuits, communication cables, and high-energy power conductors to reduce electrical interference.

Use appropriate shield termination practices for communication and analog signal wiring. Ground cable shields according to site electrical standards and avoid unnecessary shield loops. Verify rear terminal connections, module seating, and power supply compatibility before energizing the chassis.

Confirm environmental conditions remain within the specified operating temperature and humidity limits. Check communication addressing, protocol configuration, and time synchronization settings after installation.

Specifications

• Brand: General Electric

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems