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The TU865 (3BSE078712R1) serves as a specialized Module Termination Unit (MTU) designed for Select I/O Ethernet communication interfaces. As a critical infrastructure component within the ABB S800/Select I/O ecosystem, this unit enables high-speed data connectivity while providing a ruggedized physical base for field-to-controller signal management in demanding automation architectures.
This MTU is engineered for high-availability performance across diverse industrial environments, ensuring reliable communication pathways.
Model: TU865
Part Number: 3BSE078712R1
Device Type: MTU for Ethernet FCI (Select I/O)
Communication Protocol: Ethernet
Hazardous Area Certification: Yes (Compatible with hazardous location installations)
Operating Temperature: -40°C to +70°C (-40°F to 158°F)
Storage Temperature: -40°C to +85°C (-40°F to 185°F)
Relative Humidity: 5% to 95% (non-condensing)
Operating Altitude: -1000 to 5000 m (adhering to specified restrictions)
Pollution Degree: Degree 2 per IEC 60664-1
Protection Class: IP20 per IEC 60529
Overvoltage Category: Category II per IEC 60664-1
Compliance Standards: CE-marked, UKCA certified, IEC 61131-2, IEC/EN 61000-6-4, IEC/EN 61000-6-2

Quick dispatch from our global inventory to reduce downtime and ensure uninterrupted operations.
All parts are sourced from reputable manufacturers and undergo thorough quality checks.
Extensive stock of industrial automation and discontinued parts, ready for immediate shipment.
Every product — including obsolete items — is covered by a 12-month warranty and 30-day return guarantee.
All product names, trademarks, brands, and logos mentioned on this website are the property of their respective owners.These names and trademarks are used for identification and reference purposes only.We are an independent supplier of industrial automation spare parts.We are not an authorized distributor, dealer, or representative of any manufacturer.Products supplied may include surplus inventory or unused items.We do not claim any affiliation with or endorsement by the original manufacturers.