ABB TB853 3BSE057022R1 is compatible only with AC 800M redundant controller arrangements that specifically require an RCU Control Link Terminator. Confirm the controller type, redundancy configuration, link topology, associated TK856 cable, mounting location, and current ABB hardware documentation.
Do not substitute TB852, TB850, or another ABB terminator by appearance. ABB assigns different functions to the RCU Link, RCU Control Link, and CEX-Bus terminators, so the exact TB853 designation and article number 3BSE057022R1 must be preserved.
ABB continues to list TB853 3BSE057022R1 in AC 800M and System 800xA product catalogs as the RCU Control Link Terminator. Confirm current ABB lifecycle status, ordering availability, certificates, supported controller revisions, and delivery information for the exact article number.
For replacement, record the installed controller pair, redundancy topology, cable identification, terminator location, hardware revisions, and complete TB853 article number. De-energize and follow the controlled ABB hardware replacement procedure before exchanging any link component.

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