Technical Specifications
Manufacturer: ABB
Product Type: S800 I/O Module Termination Unit (MTU)
Catalog Number: 3BSE018741R50
Base Model: TU831
System Compatibility: ABB S800 I/O for System 800xA and related controllers
I/O Channel Capacity: Variant-dependent
Maximum Rated Voltage: 250 V on the field side
Maximum Rated Current: 3 A per channel
Isolation Between Field and Electronic Module: 500 V AC for 1 minute
Mechanical Keying: Present to prevent wrong module insertion
Mounting: Standard DIN rail with mechanical latch for secure fixing
Dimensions: 64 mm (W) × 170 mm (H) × 58.5 mm (D)
Weight: Approximately 0.21 kg
Material: High-grade industrial aluminum alloy
Operating Temperature: -20 to +60 °C
Storage Temperature: -40 to +85 °C
Humidity: 5 to 95 % non-condensing
Certifications: CE, UL, TÜV marks
Functional Features
Distributes ModuleBus to the connected S800 I/O module and passes bus continuity to the next MTU on the rail. Mechanical keying prevents insertion of incorrect I/O module types. The terminal connection area accommodates industrial field wiring with sufficient spacing for safe and reliable terminations.
Application Scenarios
Utilized in process automation projects employing ABB S800 I/O where the specific R50 variant is specified in the approved instrumentation index and panel fabrication drawings. Suitable for both new installations and brownfield expansions requiring like-for-like replacement of existing termination units.
Installation and Usage Notes
Consult the specific ABB S800 I/O hardware selector entry for the R50 variant to confirm terminal assignment, keying compatibility, and channel density. Mount on standard DIN rail and lock the mechanical latch to ensure proper backplane grounding. Wire field signals observing the 250 V and 3 A per channel rating. Verify address configuration per system design during commissioning.
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