TU844 3BSE021445R1
Redundant 8-Channel Module Termination Unit · Eight-channel redundant MTU with forty process connections for selected S800 I/O modules.
Lifecycle note: Use the unit nameplate and current official documentation as final references before approving a replacement.
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+86 15359408275Redundant 8-Channel Module Termination Unit · ABB S800 I/O / System 800xA
ABB TU844 3BSE021445R1 is a redundant S800 I/O Module Termination Unit that provides eight field channels and forty process connections for selected input modules.
The 50 V MTU supports documented AI845, AI880, AI880A and DP840 installations, with mechanical keying and separate process-voltage terminal groups.
Before replacement, verify the exact I/O module, key position, redundant or single arrangement, channel and process-voltage wiring, terminal torque, DIN-rail orientation, cabinet clearance and controller database.
| Manufacturer | ABB |
|---|---|
| Type designation | TU844 |
| Article number | 3BSE021445R1 |
| Product type | Module Termination Unit |
| I/O channels | 8 |
| Process connections | 40 |
| Process-voltage connections | 2 + 2 |
| Rated voltage | 50 V |
| Rated current | 2 A per channel |
| Compatible I/O modules | AI845, AI880, AI880A and DP840 |
| Mechanical keying | Yes |
| Mounting | Horizontal DIN rail |
| Width | 131 mm including connector |
| Height | 186.5 mm |
| Depth | 64 mm |
| Weight | 0.6 kg |
ABB TU844 3BSE021445R1 provides field termination and ModuleBus connection for a compatible S800 I/O module in a redundant station arrangement.
ABB TU844 3BSE021445R1 provides eight I/O channels and forty process connections, including documented process-voltage terminals.
ABB TU844 3BSE021445R1 is documented for AI845, AI880, AI880A and DP840, subject to correct mechanical keying and controller configuration.
ABB TU844 3BSE021445R1 is rated for 50 V and up to 2 A per channel within the limits of the installed I/O module and field circuit.
Another MTU cannot directly replace ABB TU844 3BSE021445R1 unless channel count, terminal map, voltage, keying, redundancy, compatible I/O and mechanical dimensions all match.
Verify horizontal DIN-rail mounting, key position, terminal torque, process-voltage polarity, channel wiring, module diagnostics and controller I/O status for ABB TU844 3BSE021445R1.
Provide the full ABB TU844 3BSE021445R1 label, companion I/O module, key position, terminal and wiring photos, quantity and destination.
Send the complete TU844 3BSE021445R1 catalog number, revision, quantity, destination and nameplate photo. Identification details will be checked before quotation.
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