Description
ABB TU807 3BSE039025R1 – S800 I/O Terminal Unit for Reliable Field Wiring and ModuleBus Continuity
The ABB TU807 3BSE039025R1 is a terminal unit (base) in the S800 I/O family. It provides the field wiring interface, ModuleBus connection, and channel distribution for a wide range of S800 I/O modules. From my experience, this is the piece that makes cabinet wiring tidy and service-friendly—especially when you’re standardizing across AI, AO, DI, or DO modules and want consistent DIN-rail mounting with clear terminal labeling.
Company’s Order Placement Process and Guarantees
- Warranty: 365 days
- Lead time: typically 1 week if in stock; no more than 1 month at the latest
- Payment: 50% advance payment; full balance prior to delivery
- Express delivery options: FedEx, UPS, DHL
Key Features
- Dedicated S800 I/O base – Acts as the mounting and wiring base for ABB S800 I/O modules, keeping ModuleBus and field connections secure.
- Clean field termination – Terminal blocks arranged for straightforward 2‑ or 3‑wire signal wiring (depending on the I/O module used), which typically reduces panel clutter.
- ModuleBus pass-through – Integrated backplane connectors ensure bus continuity across adjacent S800 units without extra jumper cables.
- DIN-rail installation – 35 mm DIN rail mounting makes it easy to expand or replace units quickly during maintenance windows.
- Service-friendly design – Clear labeling and a stable mechanical latch help technicians swap modules with minimal downtime; you might notice faster turnaround on I/O card changes.
- Industrial temperature range – Suitable for typical control cabinet environments where -20…+55°C operation is expected.
Technical Specifications
| Brand / Model | ABB TU807 (3BSE039025R1) |
| Product Type | S800 I/O terminal unit (base), passive |
| HS Code | 8538.90 (Parts for electrical control/switchgear) |
| Power Requirements | No separate power (passive base). Field 24 V DC distribution handled per connected S800 I/O module. |
| Signal I/O Types | Supports analog or digital signals as defined by the installed S800 module; typically up to 16 channels, 2‑/3‑wire terminations. |
| Communication Interfaces | S800 ModuleBus via integrated backplane connectors (pass-through between adjacent units). |
| Installation Method | 35 mm DIN rail (EN 60715); cabinet-mounted, IP20 environment. |
| Operating Temperature | Typically -20 to +55 °C (non-condensing) |
| Dimensions & Weight | Single-width S800 footprint (~45 mm W), standard S800 height/depth; approx. 0.15 kg |
Where it Fits in Your System
In many cases, TU807 is used as the wiring base for common S800 modules such as AI, AO, DI, and DO cards. Typical scenarios include upgrading brownfield cabinets where you want to keep the existing S800 ModuleBus chain intact while modernizing the I/O mix. Maintenance teams often mention that the pluggable, labeled layout helps them avoid miswires during fast turnarounds.
Related or Supporting Products
- ABB TU810 / TU812 / TU814 – Alternative S800 terminal units with different channel densities or terminal arrangements; choose based on 2‑wire vs 3‑wire needs and field power distribution.
- ABB TU818 – Terminal unit variant typically used for higher channel count or specific isolation layouts.
- ABB AI810 / AO810 / DI810 / DO810 series – S800 I/O modules that mount on TU-series bases; verify module-to-base compatibility and keying before installation.
- End clamps and 35 mm DIN rail accessories – For securing the I/O row and maintaining ModuleBus alignment.
If you’re replacing an existing base, it appears that matching the terminal unit key code and ensuring the same wiring style (screw vs. spring where applicable) avoids surprises. We can help cross-check the module pairing if needed.
Installation & Maintenance
- Cabinet environment: Mount on a 35 mm DIN rail inside an IP20 (or better) control panel with adequate ventilation; keep away from high EMI sources.
- Wiring: Use properly ferruled conductors; follow the module’s wiring diagram for 2‑wire/3‑wire connections and shielding. Torque terminals per ABB guidance to prevent loose connections.
- Bus continuity: Ensure ModuleBus connectors between adjacent units are fully seated; add end caps/stops to avoid mechanical stress on the chain.
- Safety: Isolate 24 V DC field power and control power before inserting/removing modules. Observe ESD precautions when handling electronics.
- Routine care: Periodically check terminal tightness and labeling; clean dust with a dry, anti-static brush. Firmware updates (if any) apply to the I/O modules/controller—not the passive TU.
- Spare strategy: Keeping at least one spare TU per cabinet row tends to shorten recovery time in field replacements.
Quality & Certifications
- CE marking for industrial control applications (typical for S800 I/O components)
- RoHS compliant materials
- UL/cUL listings apply to many S800 I/O parts; regional availability may vary
- Manufacturer quality system aligns with ISO standards for design and production
- Warranty: 365 days by our supply terms; manufacturer’s standard warranty may vary by region
One thing I appreciate is how the TU807 keeps things modular—swap the I/O card, keep the wiring intact. If you’re standardizing across multiple cabinets, that seemingly small detail saves hours during commissioning and later, when plants inevitably change their I/O mix.
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