TU843 3BSE021443R1 | ABB Module Termination Unit

Overview

The ABB TU843 (Part Number: 3BSE021443R1) is a Redundant Module Termination Unit (MTU) designed for the S800 I/O platform. It functions as a vertical-mounting electrical baseplate engineered to host redundant I/O modules, routing signals and power distribution safely across parallel configurations while maintaining physical network segregation.

Technical Specifications

• Product Type: Module Termination Unit (MTU) for Redundant Configuration
• Model Code: TU843
• Part Number: 3BSE021443R1
• Manufacturer: ABB
• System Family Compatibility: S800 I/O / AC 800M Controller Platforms
• Mounting Orientation: Vertical DIN Rail Mounting
• Maximum Rated Voltage: 50 V
• Redundancy Support: Yes (Designed for dual, redundant hardware pairings)
• Ingress Protection Rating: IP20
• Product Net Dimensions: 18.65 cm x 12.4 cm x 6.4 cm
• Product Net Weight: 0.66 kg

Installation Notes

• Snap the TU843 MTU vertically onto standard control enclosure DIN rails.
• Ensure the grounding spring on the back of the MTU makes clean, paint-free mechanical contact with the DIN rail to maintain reliable noise shielding.
• Verify that the mechanical key positions match the specific redundant module types scheduled for insertion.
• Route field and power wires cleanly into the dedicated termination blocks, ensuring all connections are tightened to specification to prevent loose-wire faults.