Isomax S5 to Tmax XT5 Retrofitting Kit Manual

This document provides instructions for the retrofitting kit used to fully replace plug-in moulded-case circuit-breakers of the Isomax S5 400A type with the more modern Tmax XT5 of the same size, without modifying live parts of the switchgear. It includes safety procedures, wiring guidelines for auxiliary circuits, and conditions for guaranteed electrical correspondence, such as rated current and breaking capacity.