Allen-Bradley X-40190 Relay

Allen-Bradley X-40190 is a Size 3 overload relay assembly designed for use with Allen-Bradley magnetic motor starters to provide motor overload protection. As a protective accessory in the starter circuit, it senses current and trips the control circuit to prevent motor damage during overload or fault conditions. The model is listed as discontinued by the manufacturer, and current marketplace listings show it available as new-in-box or as a used/refurbished part from third-party suppliers. In several listings the relay is described with a mounting style of B3, which indicates a particular mounting interface used with compatible starter frames. Typical applications include replacement parts in legacy control panels and spare parts for older Allen-Bradley motor-start systems where Rockwell Automation components are preferred. The X-40190 designation places it within Allen-Bradley’s family of overload-relay assemblies designed to accompany corresponding Size 3 contactors, enabling coordinated protection and simple retrofits in vintage automation installations.