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    Apter Power supports R11 and cluster-architecture verification.

TU841 3BSE020848R11

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ABB TU841 3BSE020848R11 is a single-power MTU for a TB840/TB840A modem pair and non-redundant S800 I/O.
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Ships by Friday, October 30
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Technical specifications for TU841 3BSE020848R11

  • Manufacturer:
    ABB
  • Part Number:
    TU841 3BSE020848R11
  • Product Family:
    ABB Advant OCS and Advant-800xA
  • Product Type:
    Optical ModuleBus Modem Termination Unit
  • Stock:
    1
  • Configuration:
    Redundant TB840/TB840A modems; non-redundant I/O; single power
  • Communication protocol:
    ModuleBus
  • Line redundancy:
    Yes
  • Hot swap:
    No
  • Power input:
    24 V DC (19.2-30 V)
  • Electrical ModuleBus connections:
    One
  • 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 Single-I/O Design R11 Verification Cluster Restoration

Features:

  • Modem-path resilience: The base accommodates the documented optical modem pair.
  • Single downstream branch: The field-I/O side remains intentionally non-redundant.
  • Revision-controlled purchase: The R11 suffix is retained throughout the page and enquiry record.
TU841 supports projects that require modem-pair availability without duplicating the downstream I/O path.

The correct spare decision depends on the actual cluster drawing and complete article suffix, not just the TU841 face marking.

Clear pre-removal records reduce the risk of swapped fibre, address, or downstream-bus connections.

Availability is subject to Apter Power's current inventory and sourcing confirmation.
TU841 3BSE020848R11 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.
TU841 3BSE020848R11 Optical ModuleBus Modem Termination Unit Specs

General

  • Manufacturer ABB
  • Model TU841 3BSE020848R11
  • 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.
  • Architecture boundary: The modem pair is redundant while the electrical I/O branch is single.
  • Failure analysis: Include the single branch in the project availability assessment.
  • Topology proof: Use the as-built cluster drawing to confirm the arrangement.
  • Change control: Treat any move to redundant I/O as an engineered redesign.
  • Full article: Purchase against 3BSE020848R11.
  • Label quality: Request a legible nameplate without cropped suffix characters.
  • Record update: Replace shortened legacy references in the spare-parts list.
  • Incoming check: Compare delivered label and connectors before warehouse acceptance.
  • Address: Restore the documented rotary-switch position.
  • Modem placement: Return each TB840/TB840A unit to its recorded side.
  • Single bus: Trace the only electrical ModuleBus connection.
  • Diagnostics: Clear and recheck cluster alarms after approved testing.
Description
The ABB TU841 3BSE020848R11 is a passive termination unit for two TB840 or TB840A Optical ModuleBus modems in an ABB S800 I/O cluster.

The ABB TU841 3BSE020848R11 connects the redundant modem pair to one electrical ModuleBus path for a non-redundant field-I/O arrangement.

Before ordering ABB TU841 3BSE020848R11, verify the R11 suffix, modem pair, single downstream bus, cluster address, power arrangement, and cabinet connection record.
Alternative Names
TU841 3BSE020848R11 ABB TU841 3BSE020848R11 TU841 3BSE020848R11 TU841-3BSE020848R11 TU8413BSE020848R11 S800 I/O TU841 TU841 modem termination unit
Technical notes
Retain the exact R11 article suffix in all records. A replacement review should trace the single downstream ModuleBus path end to end.
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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.
When is ABB TU841 3BSE020848R11 a better architecture match than TU840?
Choose it only when the approved design uses a redundant modem pair feeding one non-redundant I/O branch. Confirm this from the as-built topology.
What risk arises if the R11 suffix is omitted from an ABB TU841 3BSE020848R11 purchase order?
The order may be matched to an incomplete or earlier identity. Require the delivered label to reproduce the complete ABB article before acceptance.
Why could one I/O branch stay unavailable while both modems on ABB TU841 3BSE020848R11 appear healthy?
Healthy optical links do not prove the downstream branch. Check the electrical ModuleBus cable, address, power, connected I/O cluster, and controller diagnostics.
How should a factory document fibre connections before changing ABB TU841 3BSE020848R11?
Mark each cable by direction and endpoint, photograph both modem positions, cap disconnected ends, and preserve the original routing in the cabinet record.
Can ABB TU841 3BSE020848R11 be used to add downstream I/O redundancy during maintenance?
No direct conversion should be assumed. That change requires an engineered topology review and the correct ABB hardware for the redundant-I/O design.
What incoming inspection helps reject an unsuitable ABB TU841 3BSE020848R11 spare?
Check the complete R11 label, housing and latch, terminals, address switch, keying, connector integrity, and evidence of missing base components.
Which post-maintenance symptoms should be recorded for ABB TU841 3BSE020848R11 troubleshooting?
Record modem LEDs, controller events, cluster address, affected I/O, recovery timing, and whether the fault follows a cable, modem, or downstream branch.