We needed it during Beryl here in Houston, but due to high demands, it took a while to get delivered. The Champion transfer switch is basically that! It transfer switches from breakers. You can select up to 8 switches, however, keep in mind you must calculate all your total watts based on your generator running capacity and prioritize which units are necessary you need to run on your generator as some switches would require two breaker spots. The Champion 30amp transfer switch is also an indoor use, so your electrician will have to open your wall to access your master breaker wires and connect each individual master breaker to each switch on your transfer switch.Conclusion. If your concern is turning on your generator, but don’t want to ever go beyond your watts limit once its all set, then this will definitely be the best route for you!That said!!If you’re looking for a more simple & cheaper install with the flexibility of choosing which breaker you want to power ( Just be sure you’re not going over your max watts.!) and would like to actually turn off the power from main breaker (master) rather than a transfer switch (slave) then you can simply use your 30 amp inlet box (7500 watts max) directly to your breaker using an interlock kit as your only other option. Both transfer switch or an generator interlock kit set up will prevent your generator from back-feeding electricity to your city line.Never install yourself even if you think you could. Always consult professional license electrician.