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GE Multilin UR8BV UR-8BV Universal Relay Series Base Unit Chassis

The GE Multilin UR8BV, also cataloged as the UR8BV Universal Relay Series Base Unit Chassis, operates as a dedicated hardware component for modular relay rack construction and internal card interconnection within the GE Multilin Universal Relay (UR) platform.

Hardware Specifications

Parameter	Specification
Model	UR8BV
Brand	GE Multilin
Origin	United States
Dimensions	19-inch rack mount, 4U height
Operating Temp	-40 deg C to +60 deg C
Power Consumption	Passive chassis assembly; power consumption determined by installed UR modules
Product Series	GE Multilin Universal Relay (UR) Family
Module Capacity	Supports up to 8 vertical I/O and processing slots
Backplane Bus	High-speed internal communication bus with time synchronization support
Enclosure Construction	Heavy-gauge metal chassis
Mounting Type	Standard 19-inch rack mounting or panel flush mounting
Module Compatibility	UR Series CPU, power supply, CT/VT, digital I/O, and transducer modules
Protection Rating	IP40 front panel, IP20 rear terminals when properly installed
Compliance	CE, UL, cUL, IEC 60255, IEEE C37.90

Profinet / EtherNet-IP Deterministic Network and Backplane Communication

The UR8BV chassis provides the mechanical and electrical backplane structure required for communication between installed UR Series modules. The internal bus distributes module data, synchronization signals, and control information between CPU, communication, power, and I/O cards. The chassis design supports deterministic module coordination for protection relay functions requiring synchronized signal processing.

The backplane interface enables I/O density scaling by allowing different combinations of UR Series plug-in modules to be installed according to relay configuration requirements. Firmware flash compatibility depends on the installed CPU and module combination within the Universal Relay platform.

Frequently Asked Questions

Q: Does the UR8BV chassis contain processing or protection logic internally?
A: No. The UR8BV is a passive base unit chassis. Protection algorithms, communications processing, and signal acquisition functions are executed by installed UR Series CPU, communication, and I/O modules.

Q: How many modules can be installed in the UR8BV chassis?
A: The UR8BV supports up to 8 vertical I/O and processing module positions according to the Universal Relay chassis configuration.

Q: Can UR modules be inserted or removed while the relay system is energized?
A: Hot-swap capability depends on the specific installed UR module type and system configuration. Module replacement procedures must follow the applicable GE Multilin maintenance documentation.

Field Installation Guidelines

• Install the UR8BV chassis using a compatible 19-inch rack or approved panel mounting arrangement.
• Verify mechanical alignment of plug-in modules before insertion to prevent backplane connector damage.
• Maintain proper grounding between the chassis frame and the protection panel grounding system.
• Route power, CT/VT signal wiring, and communication cables separately to reduce electromagnetic interference.
• Use shielded communication wiring where required and terminate cable shields according to site grounding practices.
• Confirm rear terminal clearance and ventilation conditions before energizing installed relay modules.
• Verify module seating, connector engagement, and firmware compatibility after system assembly.

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