URRHH GE Multilin Redundancy Module | UR Series Hot Handover Redundancy Module

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URRHH

H1

URRHH GE Multilin UR Series Redundancy Hot Handover Module

The URRHH is a single-slot plug-in hot handover redundancy module built for GE Multilin UR family universal protection relays. It is designed for dual redundant CPU chassis systems, enabling seamless, bumpless hot handover between primary and standby protection processors. This module manages state synchronization, cross-chassis status exchange and trip logic transfer without interruption to protection functions. It communicates with dual UR CPU modules through Tri-Bus backplane and dedicated redundancy links. It continuously monitors health status of both primary and standby units, triggers automatic switchover upon primary CPU failure. We supply surplus original and fully tested refurbished URRHH modules with worldwide shipping and pre-shipment functional testing.

H2: Key Features

H3: Core Advantages

• Single-slot plug-in hot handover redundancy module for GE Multilin UR relay chassis
• Supports bumpless hot switchover between primary and standby CPU in dual redundant systems
• Real-time synchronization of relay settings, event data and protection states
• Health monitoring for both primary and standby protection units
• Dedicated redundancy link plus Tri-Bus backplane communication
• Auto switchover logic for hardware faults, CPU failure or communication loss
• Compliant with IEC 60255 and IEEE C37.90 standards for utility protection
• Drop-in replacement, auto recognized by UR relay firmware

H2: Technical Specifications

• Model: URRHH
• Manufacturer: GE Multilin / GE Vernova
• Product Type: Hot Handover Redundancy Module
• Compatibility: GE Multilin UR series universal relay chassis (L90, T60, B90, C60, G60 dual redundant configurations)
• Function: Dual CPU state sync, health monitoring, automatic bumpless hot switchover
• Communication: Internal Tri-Bus + dedicated redundancy interlink
• Operating Temperature: -40°C ~ +85°C
• Storage Temperature: -40°C ~ +85°C
• Humidity: 5%–95%, non-condensing
• Form Factor: Single slot plug-in module for UR chassis
• Switchover Characteristic: Bumpless hot handover, no protection interruption

H2: Applications

URRHH redundancy modules are widely deployed in power protection and automation projects:

• Critical transmission line differential protection with redundant relays
• Power plant generator and transformer redundant protection schemes
• Substation busbar protection requiring high availability
• High-reliability bay control for important utility substations
• Critical industrial power system protection with zero downtime requirement

H2: Product Condition & Supply

We provide surplus original and fully tested refurbished URRHH units. Every module undergoes complete functional inspection before ESD anti-static packing.

• Stock status: Please inquire for real-time stock availability
• Pre-shipment: Full function testing, redundancy link and switchover verification
• Packaging: Anti-static ESD packaging
• Shipping: DHL / FedEx / TNT global delivery

H2: FAQ

Q: What is URRHH?

A: URRHH is GE Multilin UR series hot handover redundancy module. It enables bumpless automatic switchover between primary and standby CPU in dual redundant UR relay systems to maintain continuous protection function.

Q: What is the difference between URRHH and UR9AH / UR9EV / UR8FV?

A: URRHH = Redundancy hot handover module for dual CPU redundant systems; UR9AH/UR9EH/UR9EV are digital I/O & VIO modules; UR8FV, UR8GH, UR8LH, UR8NH are CT/VT analog sensing modules.

Q: Can URRHH work with a single CPU chassis?

A: No. URRHH is exclusively for dual redundant UR chassis configurations, paired with two UR CPU modules to implement hot standby protection.

Q: Are your URRHH modules new?

A: We offer surplus original and fully tested refurbished URRHH modules. Contact us to confirm available condition and stock.

Q: What about warranty?

A: Warranty is available for tested modules; the warranty period depends on product condition.

GE BRAND

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