ABB TB846 3BSE021439R1 Redundant Modulebus Receiving Adaptor

Product Overview

The TB846 (3BSE021439R1) is a high-availability bus receiver designed to extend the S800 I/O Modulebus across disparate DIN rails. Engineered for redundancy, it serves as the intake point for dual-path communication signals when paired with a TB845 adaptor and TK801Vxxx cabling. Beyond electrical extension, the TB846 offers the versatility to interface with a TB842 module, enabling optical-to-electrical conversion for long-distance, noise-immune Modulebus topologies.

Technical Specifications

• Brand ABB

• Series S800 I/O

• Model Designation TB846

• Article Number 3BSE021439R1

• Functional Category Redundant Modulebus Receiving Adaptor

• Signal Support Redundant Electrical or Optical Extension

• Environmental Hardening G3 Conformal Coating (ISA-S71.04)

• Operating Temperature 0 to +55°C (Storage: -25 to +70°C)

• Electrical Safety IEC 61131-2, UL 61010-1/2-201

• Hazardous Area Ratings ATEX Zone 2, C1 Div 2 cULus, C1 Zone 2 cULus

• Marine Approvals ABS, BV, DNV, LR

• Humidity Tolerance 5 to 95% (Non-condensing)

• IP Rating IP20 (IEC 60529)

• EMC Standards EN 61000-6-2 (Immunity), EN 61000-6-4 (Emission)

• Pollution Degree Degree 2 (IEC 60664-1)

• Weight 180 g

Engineering Insights and Operational Logic

The TB846 (3BSE021439R1) is designed for mission-critical "high-availability" I/O clusters. In a redundant setup, it receives two parallel data streams to ensure that a single cable failure does not disrupt the I/O station. A standout feature is its cross-functional compatibility; while it primarily facilitates electrical extensions, its ability to pair with the TB842 allows it to act as the endpoint for an optical bus link, effectively isolating different sections of a plant from electromagnetic interference. The inclusion of G3 corrosion protection makes it suitable for deployment in sulfur-rich or chemically aggressive environments often found in wastewater treatment or heavy chemical processing.