Isomax S7 to Tmax XT7 Retrofitting Kit Manual

This document describes ABB's advanced retrofitting kit solution for upgrading obsolete Isomax S7 circuit breakers and switch-disconnectors to the modern Tmax XT7 series, with minimal modifications to existing switchgear. It details the Direct Replacement (DR) and Hard Bus Retrofill (RF) methods, emphasizing safety, service continuity, ease of installation, and sustainability through circular economy principles.