Honeywell DC-TFB403 is an IOTA associated with the non-redundant FIM4 arrangement in the Series C fieldbus hardware family. The termination assembly provides the mounting and connection foundation for the corresponding fieldbus interface hardware within the standardized Series C cabinet infrastructure.

This is a hardware-specific replacement item. It should be identified by the complete DC-TFB403 model code and checked against the installed interface module, cabinet wiring and Experion release.

• Supports the standardized Series C IOTA approach for field wiring, mounting, power distribution and grounding.
• Provides the termination foundation for a non-redundant FIM4 fieldbus interface arrangement.
• Keeps interface-module replacement separate from permanent cabinet and field connections when the approved system design is followed.
• Fits the Honeywell fieldbus integration architecture used to connect H1 devices with the Experion control environment.

DC-TFB403 is used in Series C cabinets where a non-redundant FIM4 configuration connects FOUNDATION Fieldbus instruments to an Experion system.

Fieldbus power conditioning, segment design, barriers, terminators and hazardous-area requirements remain part of the complete engineering package and are not defined by the IOTA alone.

Legacy Series C part selection must be based on the installed hardware revision and supported Experion release. Before replacement, photograph the labels, record the companion FIM model and review the cabinet drawings.

Do not substitute a redundant IOTA or an eight-link fieldbus termination assembly for DC-TFB403. Similar connectors or mechanical appearance do not establish compatibility.

Is DC-TFB403 the FIM electronics module itself?
No. It is the IOTA/termination assembly used with the associated FIM4 hardware.

Is it a redundant IOTA?
No. DC-TFB403 is the non-redundant arrangement; redundant and eight-link variants use different model numbers.

Why are no estimated dimensions, temperature or weight shown?
Those exact legacy-model values were not found in accessible Honeywell public documentation, so unsupported supplier figures are intentionally omitted.