This is a plug-in kit for 4 poles Compact NSX 400/630 fixed circuit breakers. A plug-in configuration is made by adding a plug-in kit to a fixed Compact NSX device. This kit includes a plug-in base (LV432517), 4 power connections (LV432518), 2 short terminal shields (LV432592) and a safety trip interlock (LV432520). A plug-in configuration allows to install or extract rapidly and easily the circuit breaker from its base. This operation can be done without connecting or disconnecting the power circuit.