ABB TU890 3BSC690075R1 Compact S800 I/O Termination Unit 8 Channels

Product Overview

ABB TU890 3BSC690075R1 is a compact Module Termination Unit (MTU) for S800 I/O systems. It connects field wiring and power supply to I/O modules. This passive unit contains part of the ModuleBus and generates correct module addresses. Rated for 24 V and 2 A per channel, it supports intrinsic safety applications with AI890, DI890, and other IS modules.

Model Structure & Key Features

• TU890 – Compact S800 I/O Termination Unit Series
  • 8 I/O channels for intrinsic safety and standard signals
  • 27 blue terminals for field signals and process power
  • Mechanical keying prevents wrong module insertion
  • ModuleBus distribution to I/O module and next MTU
  • Address generation by shifting position signals
  • DIN rail mounting with latching device

Technical Specifications

• Brand ABB
• Model TU890 (3BSC690075R1)
• Type Compact Module Termination Unit
• Channels 8
• Voltage 24 V
• Max current per channel 2 A
• Connection type Terminal block (blue terminals)
• Process connections 27 terminals
• Wire sizes (process) Solid 0.2-4 mm², Stranded 0.2-2.5 mm² (24-12 AWG)
• Wire sizes (power) 0.25-2.5 mm² (24-14 AWG)
• Recommended torque 0.5-0.6 Nm
• Dielectric test voltage 500 V a.c.
• Operating temperature 0 to +55 °C (+32 to +131 °F)
• Storage temperature -40 to +70 °C (-40 to +158 °F)
• Protection class IP20
• Pollution degree Degree 2
• Corrosion protection ISA-S71.04 G3
• Relative humidity 5 to 95% non-condensing
• Dimensions (HxWxD) 194 x 64 x 106 mm (7.6 x 1.77 x 4.2 in)
• Weight 0.17 kg (0.37 lbs)

Compatible I/O Modules

• Intrinsic Safety Analog Input AI890, AI893, AI895
• Intrinsic Safety Analog Output AO890, AO895
• Intrinsic Safety Digital Input DI890
• Intrinsic Safety Digital Output DO890
• Single I/O configuration (non-redundant)

Mounting & Installation

• Mounting type DIN rail with latching device
• Mounting direction Horizontal only
• Max ambient temperature 55 °C (131 °F)
• Mechanical keying Prevents incorrect module insertion
• ModuleBus connection Distributes bus to module and next MTU
• Address generation Shifts position signals automatically

Certifications & Compliance

• CE mark Yes
• Electrical safety EN 61010-1, EN 61010-2-201
• Hazardous locations ATEX/IECEx Zone 2 (interface to Zone 0), cFMus C1 Div 2/Zone 2 (interface to Div 1/Zone 0)
• Marine certifications ABS, BV, DNV-GL, LR
• EMC EN 61000-6-4, EN 61000-6-2
• RoHS EN 50581:2012
• WEEE Directive 2012/19/EU
• Equipment class Class I (earth protected)
• Overvoltage category IEC/EN 60664-1, EN 50178
• Mechanical conditions IEC/EN 61131-2

Package & Shipping

• Included TU890 unit with terminal blocks
• Warranty 12 months against defects
• Express shipping FedEx, UPS, DHL – 2-5 business days
• Order processing Within 24 hours for stock items

Frequently Asked Questions

• Q: What makes TU890 different from standard S800 termination units?
  TU890 is designed specifically for intrinsic safety applications. It works with AI890, DI890 and other IS modules. Standard units like TU810 cannot support IS modules.
• Q: Can I use TU890 with redundant I/O configurations?
  No. The TU890 supports single I/O only. For redundant configurations, use TU892 or other redundant MTUs.
• Q: What wire size works best for intrinsic safety circuits?
  Use 0.5 – 1.5 mm² stranded wire for IS signals. Follow ATEX guidelines for cable separation and shielding.
• Q: How does mechanical keying work on TU890?
  The TU890 has built-in keying that matches specific I/O modules. This prevents inserting an AI module into a DI slot by physical interference.
• Q: Is TU890 certified for Zone 0 hazardous areas?
  TU890 mounts in Zone 2 but interfaces with Zone 0 sensors through IS barriers. It holds ATEX and cFMus certifications for this use.
• Selection tip: Choose TU890 when you need intrinsic safety in compact S800 systems. It saves panel space with 8 channels in 64 mm width.
• Experience note: Always torque terminals to 0.5-0.6 Nm. Loose connections in IS circuits can cause sparking risks.

Contact Information

• Email sales@powergearx.com
• WhatsApp +86 180 3005 825
• Website www.powergearx.com

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