ABB TU844 3BSE021445R1 Termination Unit

TU844 MTU Overview

The TU844 is a versatile Terminal Unit (MTU) designed for use in industrial automation and control systems. Here are the key features and details:

Features and Benefits

1. Installation and Connectivity:

   • Enables complete installation of I/O modules using 2-wire connections and field power distribution.
   • Supports up to 8 channels of field signals and process power connections.
   • Provides connections to two ModuleBuses and I/O modules.

2. Mechanical Keying:

   • Four mechanical keys (two for each I/O module) allow configuration for different types of I/O modules.
   • Mechanical keying prevents incorrect insertion of I/O modules.
   • Offers a total of 36 different configurations.

3. Mounting and Locking:

   • Can be mounted on a standard DIN rail.
   • Features a mechanical latch that locks the MTU securely to the DIN rail.

General Information

• Article Number: 3BSE021445R1
• Type: Redundant
• Connection: Terminal block
• Channels: 8
• Voltage: 50 V
• Mounting: Horizontal (55 ºC / 131 °F)
• Compatible with I/O Modules: AI845, AI880, AI880A, and DP840
• Process Connections: Up to 8 I/O channels (2 terminals per channel), 4 process power, 20 process power (0 V)
• Single/Redundant I/O: Redundant

Detailed Data

• Maximum Current per I/O Channel: 2 A
• Maximum Current for Process Connection: 5 A
• Acceptable Wire Sizes:
  • Solid: 0.2 - 4 mm²
  • Stranded: 0.2 - 2.5 mm² (24 - 12 AWG)
  • Recommended torque: 0.5 - 0.6 Nm, Stripping length: 7 mm
• Dielectric Test Voltage: 500 V a.c.

Environment and Certification

• CE Mark: Yes
• Electrical Safety Standards: EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201
• Hazardous Location Certifications: C1 Div 2 cULus, C1 Zone 2 cULus, ATEX Zone 2
• Marine Certifications: ABS, BV, DNV-GL, LR
• Operating Temperature: 0 to +55 °C (+32 to +131 °F), approvals issued for +5 to +55 °C
• Storage Temperature: -40 to +70 °C (-40 to +158 °F)
• Pollution Degree: Degree 2, IEC 60664-1
• Corrosion Protection: ISA-S71.04: G3
• Relative Humidity: 5 to 95%, non-condensing
• Max Ambient Temperature: 55 °C (131 °F)
• Protection Class: IP20 according to IEC 60529
• Mechanical Operating Conditions: IEC/EN 61131-2
• EMC Standards: EN 61000-6-4, EN 61000-6-2
• Overvoltage Categories: IEC/EN 60664-1, EN 50178
• Equipment Class: Class I according to IEC 61140 (earth protected)
• RoHS Compliance: EN 50581:2012
• WEEE Compliance: DIRECTIVE/2012/19/EU

Dimensions

• Width: 131 mm (5.16”) including connector, 124 mm (4.88”) edge to edge when installed
• Depth: 64 mm (2.52”) including terminals
• Height: 186.5 mm (7.34”) including locking device
• Weight: 0.6 kg (1.3 lbs.)