Generator interlock kits are available for Square D QO and Homeline 150 and 200 amp panels.
Safe use:the manual transfer switch device allow portable generator safe back feeding power supply to distribution panel and home line. Prevent utility and generator supplies from being ON at the same time. Aren't putting electrician in dangerous and damage electric devices during power outages.
Required Interval Space: 1 3/8 Inch Distance between the main breaker and the generator breaker.