ABB TU831V1 3BSE013235R1 – Compact S800 I/O Termination Unit for clean, reliable field wiring

The ABB TU831V1 (3BSE013235R1) is a compact Module Termination Unit for the S800 I/O family. It sits between your field devices and the I/O module, tidying up wiring and carrying the ModuleBus connection. From my experience, plants choose the TU831V1 when cabinet space is tight but they still want the robust, modular build that S800 I/O is known for. You might notice that commissioning time drops, because channels are clearly laid out and changes are quick—no extra terminal strips to fuss over.

Order Placement Process and Guarantees

• Warranty: 365 days
• Lead time: typically 1 week if in stock; not more than 1 month at the latest
• Payment terms: 50% advance payment; full payment before delivery
• Express options: FedEx, UPS, DHL

Key Features

• Compact S800 MTU – Designed for ABB S800 I/O modules, streamlining field wiring and the ModuleBus backplane.
• Passive, robust base – No separate power feed; it routes signals and 24 VDC distribution from the backplane to field terminals.
• Clean channel layout – Typically used with 16‑channel S800 modules (DI/DO/AI/AO), making loop checks and replacements faster.
• DIN‑rail friendly – Quick snap-on to 35 mm DIN rail; ideal for dense cabinets and retrofit jobs.
• Service-friendly – Module can be swapped without disturbing field wiring; a small detail that saves hours during outages.
• Industrial temperature rating – Suited for typical S800 I/O cabinet environments in utilities, chemical, metals, and water plants.

Technical Specifications

A maintenance lead from a water treatment client told me they swapped to TU831V1s during a panel refresh—what stood out was fewer wiring errors in loop checks and a simpler path to add channels later. It seems to be a small part, but it reduces downtime when you’re moving fast.

Related and Supporting Products

• ABB TU810 / TU812 / TU814 – Alternative S800 MTUs with different terminal layouts and density options.
• ABB TU830 / TU833 – Compact MTUs used where very tight spacing or specific field termination styles are required.
• ABB TB810 Keying Plug – Ensures correct I/O module/MTU pairing and prevents mis-insertion.
• ABB DI810, DO810, AI810, AO810 – Common S800 I/O modules that mount onto TU-series bases.
• ABB CI851 / CI854 – Communication interfaces for connecting S800 I/O to higher-level controllers and fieldbuses.

Installation & Maintenance

• Cabinet environment – Mount on a 35 mm DIN rail inside a ventilated enclosure; keep within typical S800 temperature and humidity limits.
• Wiring practice – Separate low-voltage signal wiring from power/relay lines; label channels clearly; keep bend radius gentle to avoid pull-out.
• Grounding – Follow ABB grounding and shield termination guidance; avoid ground loops by defining a single-point reference.
• Module handling – The TU stays wired; I/O modules can be replaced without disturbing field terminations, which typically cuts swap time.
• Routine checks – Quarterly: retighten terminal screws if needed, visually inspect for discoloration or cracked insulation, and clean dust with dry air.
• Firmware – The TU is passive; any firmware updates apply to the attached S800 I/O modules or communication interfaces.

Quality & Certifications

• CE compliant; RoHS compliant; typically UL/cUL listed within the S800 I/O system context.
• Manufactured under ABB quality systems (ISO 9001 based).
• Manufacturer warranty is typically 12 months depending on region and terms; our supply warranty is 365 days as stated above.