ABB TU890 3BSC690075R1 Compact MTU

Overview

The TU891 is a compact MTU (Module Terminal Unit) designed for ABB's S800 I/O system. It serves as a passive unit that connects the field wiring and power supply to I/O modules while distributing the ModuleBus signal. This unit plays a key role in connecting multiple MTUs and I/O modules in an industrial automation setup. Below are the detailed specifications and features of the TU891.

General Info

• Article Number: 3BSC690075R1
• Type: Compact
• Connection Type: Terminal block
• Channels: 8
• Voltage: 24 V DC
• Mounting Orientation: Horizontal
• Max Rated Voltage: 50 V
• Max Rated Current: 2 A per channel (subject to I/O module design constraints)
• Mounting Temperature Range: 55°C (131°F)
• I/O Compatibility: AI890, AI893, AI895, AO890, AO895, DI890, DO890
• Process Connections: 27 blue terminals
• I/O Configuration: Single

Detailed Data

• Maximum Current per I/O Channel: 2 A
• Wire Sizes for Process Connector:
  • Solid: 0.2 - 4 mm²
  • Stranded: 0.2 - 2.5 mm² (24 - 12 AWG)
• Wire Sizes for Power Supply Connector:
  • 0.25 - 2.5 mm² (24 - 14 AWG)
• Recommended Torque: 0.5 - 0.6 Nm
• Dielectric Test Voltage: 500 V a.c.

Environment and Certification

• CE Mark: Yes
• Electrical Safety: EN 61010-1, EN 61010-2-201
• Hazardous Location Certifications:
  • ATEX/IECEx Zone 2 with interface to Zone 0
  • cFMus C1, Div 2/Zone 2 with interface to C1, C2, C3 Div 1/Zone 0
• Marine Certification: ABS, BV, DNV-GL, LR
• Operating Temperature: 0 to +55°C (32 to 131°F)
  • Storage Temperature: -40 to +70°C (-40 to +158°F)
  • Relative Humidity: 5 to 95%, non-condensing
• Pollution Degree: 2 (IEC 60664-1)
• Corrosion Protection: ISA-S71.04: G3
• Max Ambient Temperature: 55°C (131°F) for horizontal mounting; 40°C (104°F) for vertical mounting
• Protection Class: IP20 (IEC 60529)
• Mechanical Operating Conditions: IEC/EN 61131-2
• EMC: EN 61000-6-4, EN 61000-6-2
• Overvoltage Categories: IEC/EN 60664-1, EN 50178
• Equipment Class: Class I (earth protected)

Dimensions

• Width: 64 mm (1.77 in.), 58.5 mm (2.3 in.) edge-to-edge when installed
• Depth: 58 mm (2.28 in.), 106 mm (4.2 in.) including terminals
• Height: 194 mm (7.6 in.) including latch
• Weight: 0.17 kg (0.37 lbs.)

Features and Benefits

• 8 Channels with Process Voltage Supervision
• Output Status Indicators
• Output Safe Position (OSP): Sets outputs to a predetermined state upon error detection
• Short-Circuit Protection: To ground and up to 30 V
• Over-Voltage and Over-Temperature Protection
• Intrinsic Safety Support
• NAMUR Inputs
• G3 Compliance: Suitable for harsh industrial environments