ABB S800 TU838 3BSE008572R1 Extended Module Termination Unit

Overview

The ABB TU838 (Part Number: 3BSE008572R1) is an Extended Module Termination Unit (MTU) designed for the S800 I/O platform. It functions as a single-slot, non-redundant, passive interface baseplate that connects one S800 I/O module to the ModuleBus. Equipped with a three-row compression screw terminal block, the TU838 provides individual field-side power distribution links and return paths, helping to eliminate external marshalling terminal components within the control enclosure.

Technical Specifications

• Product Type: Extended Module Termination Unit (MTU) for Non-Redundant Configurations
• Model Code: TU838
• Part Number: 3BSE008572R1
• Manufacturer: ABB
• System Family Compatibility: S800 I/O System (Accepts various 800-series modules)
• Channel / Module Capacity: Single-slot layout (1 module per MTU)
• Terminal Design Framework: Three-row compression screw terminal block architecture
• Maximum Rated Voltage: 50 V
• Maximum Continuous Current per Channel: 3 A
• Acceptable Wire Sizes: Solid/Stranded 0.2 to 2.5 mm² (24 to 12 AWG)
• Ingress Protection Rating: IP20 (IEC 60529 Compliant)
• Conformal Coating: Factory standard protection for harsh environment reliability
• Mounting Style: Horizontal or Vertical 35 mm DIN Rail
• Physical Dimensions: 20.4 cm x 5.6 cm x 4.7 cm
• Product Net Weight: 0.27 kg

Installation Notes

• Snap the TU838 MTU firmly onto the cabinet DIN rail until the rear locking mechanism fully engages.
• Ensure the integrated grounding clip makes solid, paint-free contact with the metallic rail to guarantee reliable noise rejection.
• Set the mechanical keying wheels on the MTU face to exactly match the designated keying profile of the target S800 I/O module before slotting the electronics in.
• Terminate field loop and loop power wiring into the three-row screw terminal blocks, ensuring proper wire strip lengths to preserve the touch-safe IP20 rating.