Generator Interlock Kits will keep your power on.

Generator Interlock Kits Panel-Specific, MET-Listed, Made in the USA

A generator interlock kit installs directly on your existing breaker panel and physically prevents the main utility breaker and your generator breaker from being on at the same time. That mechanical separation stops back-feed onto the utility line, meets NEC 702 requirements, and does it without a separate transfer panel or sub-panel. GenInterlock carries panel-specific kits for most major residential panel brands, including Siemens, Square D, Eaton, Cutler Hammer, GE, Murray, and more, including many older legacy brands most suppliers no longer stock. Every house-brand kit is MET-listed, manufactured in the USA, and ships free.