Product Overview
The TU842 (Part Number: 3BSE020850R1) is a high-integrity Redundant Module Termination Unit (MTU) designed for the ABB S800 I/O system, compatible with Symphony Plus and AC 800M controllers. Its primary technical function is to provide the physical and electrical interface for redundant I/O configurations. The TU842 (3BSE020850R1) distributes dual ModuleBuses to each I/O module and ensures signal continuity to subsequent MTUs in the cluster. By shifting outgoing position signals, it automatically generates the correct hardware addresses for the I/O modules. This unit is essential for high-availability industrial processes where communication redundancy and secure field wiring termination are critical to preventing system downtime.
Detailed Technical Specifications
| Feature | Specification |
| Manufacturer | ABB |
| Model Number | TU842 |
| Product ID | 3BSE020850R1 |
| Product Type | Redundant Module Termination Unit (MTU) |
| I/O Channels | Up to 16 channels |
| Process Voltage Conn. | 2 + 2 connections |
| Max Rated Voltage | 50 V |
| Max Rated Current | 3 A per channel |
| Connection Type | Individual I/O connections (2 per channel) + 1 ZP connection |
| Bus Support | Dual ModuleBus distribution |
| Isolation | Galvanic isolation between field and system bus |
| Operating Temperature | -25 °C to +60 °C |
| Dimensions | 45 mm x 119 mm x 71 mm |
| Weight | 0.2 kg (Net) / 2.0 kg (Shipping) |
| Material | Flame-retardant industrial-grade plastic |
What's clients say about us
Excellent Emergency Support!
Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.
Mark Thompson
Maintenance Manager, USAReliable Source for New Spares
Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.
Robert Hoffmann
Engineering Lead, GermanyTop-tier Service and Quality
We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.
Lucas Müller
Operations Director, GermanyRelated Products
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