TU848 Termination Unit – Redundant MTU ABB

ABB TU848 Module Termination Unit – Redundant ModuleBus MTU

Technical Specifications – ABB TU848

• Brand & model: ABB TU848.
• Communication protocol: ModuleBus (master/slave not applicable).
• Line redundancy: Yes – dual ModuleBus lines.
• Module redundancy: Yes – supports two TB840/TB840A modems.
• Hot swap support: No – power off before module replacement.
• Power input: 24 V d.c. (19.2 – 30 V), dual terminals.
• Current distribution (ModuleBus): 5 V @ 1.5 A / 24 V @ 1.5 A.
• Power dissipation: 2.5 W typical.
• Mechanical keys: 36 different combinations (two keys × six positions).
• Wire sizes accepted: Solid 0.2‑2.5 mm²; stranded 0.2‑2.5 mm² (24‑12 AWG). Recommended torque 0.5 Nm.
• Rated insulation voltage: 50 V; dielectric test 500 V a.c.
• Operating temperature: 0 to +55 °C (+32 to +131 °F) – approvals rated +5 to +55 °C.
• Storage temperature: -40 to +70 °C (-40 to +158 °F).
• Relative humidity: 5‑95 % non‑condensing.
• Max ambient (vertical mount): 40 °C (104 °F); horizontal mount allows 55 °C (131 °F).
• Ingress protection: IP20 per IEC 60529.
• Equipment class: Class I (earth protected) per IEC 60536.
• Dimensions (W×H×D): 124 × 186.5 × 47 mm (4.88 × 7.34 × 1.85 in) including latch.
• Weight: 0.45 kg (0.99 lbs).

Frequently Asked Questions (FAQ)

• Q: Is the TU848 compatible with TB840A modems?
  A: Yes, the 3BSE042558R1 specifically supports both TB840 and TB840A in redundant modem configurations.
• Q: Can I hot‑swap modems while power is on?
  A: No – the TU848 does not support hot swap. Always disconnect power before inserting or removing modems.
• Q: What is the difference between TU848 and TU849?
  A: TU848 connects modems to redundant I/O with dual power, while TU849 serves non‑redundant I/O applications.
• Q: How do I set the cluster address?
  A: Use the rotary switch on the front panel – positions 1 to 7. Set the address before system start‑up.
• Q: What wire gauge works best for power terminals?
  A: Use 0.2‑2.5 mm² (24‑12 AWG) solid or stranded copper wire. Torque to 0.5 Nm for secure termination.
• Q: Is this unit certified for hazardous areas?
  A: Yes, it carries cULus Hazardous Location Class 1 Zone 2 and ATEX Zone 2 approvals.

Contact Information
For inquiries, please email sales@nex-auto.com or reach us via +86 153 9242 9628 on WhatsApp.
Partner: NexAuto Technology Limited