Features:
- Redundant-I/O base: The MTU supports two field-I/O paths beneath a modem pair.
- Single supply architecture: Power planning remains distinct from the communication redundancy design.
- Cluster-level control: Addressing and keying support disciplined S800 I/O maintenance.
TU840 is intended for architectures that retain redundancy beyond the Optical ModuleBus modem pair.
Procurement should be tied to a marked-up topology drawing because similar modem bases do not provide the same downstream arrangement.
The page is organized to help maintenance teams coordinate hardware identity, system records, and a controlled outage.
Availability is subject to Apter Power's current inventory and sourcing confirmation.
TU840 3BSE020846R1 Manuals and Resources
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.
TU840 3BSE020846R1 Optical ModuleBus Modem Termination Unit Specs
General
- Manufacturer ABB
- Model TU840 3BSE020846R1
- Condition New Original ready stock
- Product Family S800 I/O Communication Interfaces
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.
- Downstream design: TU840 continues redundancy to the I/O side; TU841 serves single I/O.
- Bus paths: TU840 provides two electrical ModuleBus connections.
- Order identity: Use 3BSE020846R1 for the TU840 configuration.
- Engineering review: Confirm the installed topology rather than choosing by enclosure appearance.
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- Modem labels: Verify both installed units are TB840 or TB840A variants supported by the project.
- Position record: Photograph left and right modem placement.
- Optical route: Map incoming and outgoing fibre before isolation.
- Cluster ownership: Link the modem pair to the correct controller and cluster drawing.
- No hot swap: Plan a controlled shutdown under the site procedure.
- Address capture: Record the rotary-switch position.
- Cable tags: Label power, ModuleBus, and optical connections separately.
- Recovery plan: Prepare communication and redundant-I/O acceptance tests.