Generator Interlock Kit Compatible with Eaton Cutler Hammer BR Series 150 & 200 Amp Panels, 1 1/4-1 7/16 Inch Spacing Between Main Breaker and Branch Breaker, Professional Interlock Kit

Main breakers don’t disconnect the neutral and neither do most generator transfer switches. They sell kits that are meant to interlock your main breaker with a generator plug so you can’t have both on at the same time. The danger is from feeding power back into the grid and electrocuting lineman. https://www.amazon.com/Generator-Interlock-Compatible-Professional-EAT-PN200/dp/B0DLTYHT2N