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TU840 3BSE020846R1

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ABB TU840 3BSE020846R1 is a single-power MTU for a TB840/TB840A modem pair and redundant S800 I/O.
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Technical specifications for TU840 3BSE020846R1

  • Manufacturer:
    ABB
  • Part Number:
    TU840 3BSE020846R1
  • Product Family:
    ABB Advant OCS and Advant-800xA
  • Product Type:
    Optical ModuleBus Modem Termination Unit
  • Stock:
    1
  • Configuration:
    Redundant TB840/TB840A modems; redundant I/O; single power
  • Communication protocol:
    ModuleBus
  • Line redundancy:
    Yes
  • Module redundancy:
    Yes
  • Hot swap:
    No
  • Power input:
    24 V DC (19.2-30 V)
  • Electrical ModuleBus connections:
    Two
  • Cluster address:
    Rotary switch positions 1-7
  • Conductor range:
    Solid or stranded 0.2-2.5 mm²
  • Recommended terminal torque:
    0.5 Nm
  • Rated insulation voltage:
    50 V
  • Dielectric test:
    500 V AC
  • Power dissipation:
    2.0 W
  • Operating temperature:
    0 to +55 °C
  • Storage temperature:
    -40 to +70 °C
  • Protection rating:
    IP20
  • Weight:
    0.45 kg
  • Estimated shipping dimensions:
    12.4x4.7x18.65cm
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    Sweden
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications TU840 vs TU841 Modem Pairing Outage Preparation

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.
Description
The ABB TU840 3BSE020846R1 is a passive modem termination unit for two TB840 or TB840A Optical ModuleBus modems in an ABB S800 I/O cluster.

The ABB TU840 3BSE020846R1 supports a redundant-I/O arrangement through two electrical ModuleBus paths while using one 24 V DC supply input.

Before ordering ABB TU840 3BSE020846R1, confirm both modem labels, the redundant field-I/O design, cluster address, installed cabling, keying, and the full article number.
Alternative Names
TU840 3BSE020846R1 ABB TU840 3BSE020846R1 TU840 3BSE020846R1 TU840-3BSE020846R1 TU8403BSE020846R1 S800 I/O TU840 TU840 modem termination unit
Technical notes
A TU840 exchange affects both ModuleBus paths. Record modem positions and the cluster address before isolation.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Can ABB TU840 3BSE020846R1 be selected when only the modem side is redundant?
Not from modem redundancy alone. Confirm that the project also requires redundant downstream I/O; otherwise review the documented TU841 architecture.
Why might an S800 cluster remain offline after replacing ABB TU840 3BSE020846R1?
Check the recorded cluster address, both modem positions, optical routing, power polarity, ModuleBus connections, and controller diagnostics in that order.
What should be compared when a supplier offers ABB TU840 3BSE020846R1 against a TU840 label photo?
Match the complete ABB article, connector condition, keying, address hardware, terminal condition, and evidence that no modem-base parts are missing.
How should maintenance teams protect fibre routing during an ABB TU840 3BSE020846R1 exchange?
Tag each optical cable by source and destination, protect connector ends, respect the project bend-radius rule, and verify link recovery before closing the cabinet.
What redundant-I/O tests add value after installing ABB TU840 3BSE020846R1?
Exercise both documented communication paths, review controller and modem diagnostics, and confirm that affected I/O remains available under the approved failover test.
Can ABB TU840 3BSE020846R1 resolve an existing communication fault without system diagnosis?
A replacement alone is not proof of root cause. Inspect power, fibre, both modems, address settings, ModuleBus cabling, and controller events before condemning the MTU.
What project documents should accompany a spare ABB TU840 3BSE020846R1?
Retain the cluster topology, address schedule, modem labels, fibre map, redundancy test record, and the cabinet change history with the spare record.

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