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