ABB TU834 3BSE040364R1 Termination Unit

Product Description

The TU845 (3BSE021446R1) is a high-availability, redundant Module Termination Unit (MTU) engineered for the ABB S800 I/O system. It is specifically designed to host redundant AI880A High Integrity analog input modules. This unit provides a secure physical and electrical platform for 8-channel analog configurations, ensuring that critical process data remains available even if one module fails. The TU845 manages the distribution of the ModuleBus and process power across the redundant pair, making it an essential component for safety-instrumented systems (SIS) and mission-critical industrial loops.

Technical Specifications

• Manufacturer: ABB

• Model Number: TU845

• Ordering Code: 3BSE021446R1

• Product Type: Redundant Module Termination Unit

• Compatible I/O Module: AI880A (High Integrity Analog Input)

• Channel Capacity: 8 Channels (Redundant)

• Configuration: 1+1 Module Redundancy

• Shunt Support: Requires TY801 shunt sticks (sold separately)

• Mounting Orientation: Horizontal DIN rail

• HS Code: 85371098 (Electrical Control/Distribution Boards)

• Net Weight: 0.34 kg (0.75 lbs)

• Module Width: 110 mm

• Module Height: 120.5 mm

• Module Depth: 64 mm

• Environmental: RoHS compliant (EU Directive 2011/65/EU)

Key Features & High Integrity Design

The TU845 (3BSE021446R1) is built for maximum uptime and system safety:

• Redundant Architecture: Features dual sockets for side-by-side mounting of two AI880A modules. This allows for seamless "Hot Swapping," where a faulty module can be replaced without interrupting the 4-20mA signal loop.

• Compact Footprint: At only 110mm wide, it provides high-density redundancy, saving valuable space in control cabinets.

• Advanced Addressing: Automatically handles ModuleBus position signaling, ensuring the I/O controller recognizes the redundant pair correctly without manual DIP switch settings.