Almost embarassed to say that I never pay attention to the "automatic transfer switch". At home, to exercise the Onan, I even start the generator while still plugged into shore power, then have to run outside to shut off the 50a breaker on my house. Never had any issue, but heard of several who have. Only time I've had an electrical issue was when I didn't have the pigtail twisted sufficiently after inserting to pick up both legs.
Mike & Pam '12 36RL, Kodiak Discs, 17.5" G114s H-Rated, SRE4000 w/HD Shackles, Joy Rider Shocks, Flex Air, 5.5 Onan, W&D, DW, 4 Scare Lights, (2) 6V Trojan T-145s; Progressive EMS-HW50C, Winegard DTV Sat, Sony/Denon 4K Home Theater, WiFiRanger EliteAC Pack, weBoost 4G-X Cell Booster.
2020 RAM 3500 Limited CC, LB, 4x4, DRW, Cummins HO, AISIN, 4.10, Curt A30 w/OEM Prep, Transfer Flow 70gal Aux Tank/Toolbox.