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Ok, so I see that most main branch breakers are warranted for life which means it must be robust. I could not find any information on how it internally disconnects and if it is different than a regular circuit breaker. I had a quick look and could not find a transfer switch which didn't have...

Lineman are trained to assume power is on but homeowners are not so when they turn that main off they expect it to be off. I will have to dig into this more because now I am curious just how that main breaker differs from a standard breaker.

I just wonder if it is a different kind of breaker. Mine has a huge throw to it. One issue I have with transfer switches is that many make you select only a few circuits and I like to manage loads and have access to all circuits in my main and sub panels.

Isaac-1, With an interlock you are switching the main power switch off. This is a switch not a breaker - right? It must be pretty reliable or the consumer could get shocked if it failed when in the off position. I personally think it would be extremely rare for that switch to fail and although...