This is a plug-in kit for 4 poles Compact NSX 100/160/250 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 (LV429267), 4 power connections (LV429268), 2 short terminal shields (LV429516) and a safety trip interlock (LV429270). 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.