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TU843 is the vertical member of ABB’s redundant 50 V S800 I/O termination arrangement.
The MTU is passive: redundancy behavior and diagnostics belong to the installed I/O and system design, not an undocumented internal switch function.
Replacement review should compare TU843 and 3BSE021443R1 with the module label, terminal drawing, power grouping, mounting direction, and mechanical keys.
Internal resources for TU843 3BSE021443R1:
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.





