ABBS800 I/O

Verified product record

ABB TU839 3BSE046966R1 S800 I/O Extended Module Termination Unit

Product Overview

ABB TU839 3BSE046966R1 is an extended S800 I/O module termination unit for landing field conductors and fused sensor-power circuits beneath compatible digital input modules. It provides the removable mechanical and electrical interface between cabinet wiring, the installed I/O module and the ModuleBus station.

Terminal organization on ABB TU839 3BSE046966R1 separates two groups of eight signal connections from two groups of four fused sensor-power outputs. That arrangement lets the input module receive field states while the associated sensors draw their protected supply from defined terminal groups instead of an undocumented shared feed.

When used with ABB TU839 3BSE046966R1, compatible DI820 or DI821 modules are seated only after conductor numbering, fuse selection and the 250 V isolation boundary are checked. Replacement preserves the terminal map and proves one signal and sensor-supply path from each group before all channels return to service.

ABB TU839 exact-article terminal-unit view

Technical Specifications

Exact-model engineering data

Brand	ABB
Model	TU839 3BSE046966R1
Product Name	S800 I/O Extended Module Termination Unit
Country	Switzerland
System Family	S800 I/O
MTU Type	Extended module termination unit
Rated Isolation	250 V
Signal Terminals	2 × 8 signal connections
Sensor-Power Outputs	2 × 4 fused outputs
Protection	Fused sensor-power distribution
Compatible Modules	DI820 and DI821
Mounting Role	Field termination and module seating in S800 I/O

Installation Highlights

Install ABB TU839 3BSE046966R1 by preserving the two signal groups, fused sensor-power groups and module keying as independent checks. The work sequence keeps field wiring de-energized until the terminal map and protective devices have been verified.

Prepare the terminal map

Label the two eight-signal groups and their corresponding sensor-power circuits before any conductor is moved. Isolate all field supplies, prove the de-energized state and record the installed fuse ratings and module key positions.

Mount and terminate

Secure the MTU in the documented S800 position, route conductors without covering the module seat and land each signal and protected sensor feed on its assigned terminal. Check conductor torque, separation and cabinet clearance before inserting the I/O module.

Seat and prove the module

Install the compatible DI820 or DI821 only after the mechanical keys and article identity agree. Restore power in controlled stages, then prove one signal and one fused sensor-power output from each group before testing the remaining channels.

Key Features

The product-specific features of ABB TU839 3BSE046966R1 are its 250 V isolation class, two-bank terminal organization and built-in fused sensor-power distribution. These are physical and electrical characteristics of the MTU, not ordering-code guidance.

250 V isolation class

The extended MTU maintains the documented 250 V isolation boundary for the compatible S800 I/O arrangement. This feature allows the termination unit to support the specified high-isolation digital-input installation while preserving the system’s defined separation.

Grouped signal layout

Two banks of eight signal terminals mirror the channel organization of the installed digital-input module. The grouped layout keeps conductor numbering, commons and channel troubleshooting aligned with the controller channel map.

Fused sensor supply

Two groups of four protected sensor-power outputs distribute field supply directly from defined terminal groups. Integrated fusing keeps each protected feed visible in the MTU wiring record instead of relying on an undocumented external fuse arrangement.

Frequently Asked Questions

Which modules are documented with ABB TU839 3BSE046966R1?

ABB TU839 3BSE046966R1 is documented for the compatible DI820 and DI821 S800 I/O digital-input modules.

How are the terminals grouped on ABB TU839 3BSE046966R1?

ABB TU839 3BSE046966R1 provides two groups of eight signal terminals and two groups of four fused sensor-power outputs.

Why must fuse selection be checked on ABB TU839 3BSE046966R1?

The sensor-power outputs of ABB TU839 3BSE046966R1 are fused, so the installed fuse and load must match the documented field circuit rather than being treated as an unlimited supply.

Can ABB TU839 3BSE046966R1 be replaced without recording conductors?

No. Before replacing ABB TU839 3BSE046966R1, record every signal, sensor-power conductor, group and fuse so the original terminal map is preserved.

What does the 250 V rating mean for ABB TU839 3BSE046966R1?

The 250 V value identifies the documented isolation class of ABB TU839 3BSE046966R1; it is not a statement that every connected signal or sensor is powered at 250 V.

How is ABB TU839 3BSE046966R1 checked after installation?

After installing ABB TU839 3BSE046966R1, verify module seating, fuse continuity and one signal and sensor-supply path from each terminal group before testing all channels.

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Contact Information

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Product Name	ABB TU839 3BSE046966R1 S800 I/O Extended Module Termination Unit
Item NO.	2928410
Weight	0.1 kg = 0.2205 lb = 3.5274 oz
Category	ABB
Brand	ABB
Creation Time	2026-10-30

ABB TU839 3BSE046966R1 S800 I/O Extended Module Termination Unit Item NO.: 2928410