Reliance Electric 805403-2R Resistor Scaling Module

The Reliance Electric 805403-2R Resistor Scaling Module is a dedicated, plug‑in component designed for Reliance Electric's AutoMax programmable logic controller (PLC) family, serving as a resistor scaling assembly that conditions and scales input signals for reliable processing by AutoMax controllers in industrial automation environments. Carrying part number 805403-2R, the module is documented in multiple distributor catalogs as an AutoMax accessory and is often stocked or repaired through specialist electronics repair vendors, reflecting its role as a trusted replacement part for legacy Reliance Electric systems. Historically associated with the Baldor Reliance portfolio and later linked to ABB, these modules are described in catalogs and repair listings as resistor scaling assemblies, underscoring their function within the resistor networks that feed AutoMax I/O channels. Typical applications include retrofitting or refurbishing older AutoMax installations where resistor-based signal conditioning is required to map sensor or process signals to the PLC’s input ranges, making the 805403-2R a focused component for maintaining legacy control architectures.