Plug-in base for Schneider Electric 4 pole Compact NSX 100/160/250 Circuit Breaker. The plug-in base is included in the complete plug-in kit. Plug-in configuration is done by adding a plug-in kit to a fixed Compact NSX device Plug-in configuration allows you to quickly and easily install or extract a Circuit Breaker from the base. You can do this without connecting or disconnecting the power circuits. Plug-in mounting mode mercury-free