It is an IVE integrated control circuit for the electrical interlocking of Compact NSX, Compact NS and Masterpact devices. The electrical interlocking is used with a mechanical interlocking system. The relays controlling the closing order to the “N” and “R” circuit breakers must be mechanically and/or electrically interlocked to prevent them from giving simultaneous closing commands. The control voltage is from 48VAC to 415VAC 50/60Hz, or 440VAC 60Hz.