The Plug-On Neutral (PON) system in the Siemens PNW2040B1200C Load Center simplifies installation by eliminating the need for pigtail wires on neutral connections. Instead, it features an integrated neutral bus, allowing circuit breakers to connect directly to the neutral bar without extra wiring. Benefits of Plug-On Neutral: Faster installation – No need to manage excess neutral wires. More reliable connections – Direct plug-on design reduces loose connections. Improved wire bending space – Provides over four inches of extra room for easier wiring.