Isomax S7 to Tmax XT7-XT7M Retrofit Kit Instructions

This document provides instructions for a retrofitting kit designed to replace obsolete Isomax S7 air circuit breakers (1250A to 2500A, withdrawable version) with Tmax XT7-XT7M circuit breakers of the same size, preserving electrical characteristics and auxiliary circuit functionality. It includes safety procedures, mounting instructions, and a compatibility table (Table A) detailing current ratings and terminal types (HR, F, VR) with associated derating values.