GenInterlock SD-200VL Square D Generator Interlock Kit for Vertical Main 150 or 200 amp breaker

Impressed with build quality and clarity of install instructions. Every detail, including identifying stickers for emergency breaker, generator inlet, and generator startup procedure were included.

Heavy duty quality and good instructions. Made in the USA, too!

This is a well made produce and easy to install

Followed directions including the initial placement and marking holes. After drilling out, screws weren't a perfect fit and had to "expand" holes a little with the supplied drill bit. Once installed, the 3rd/4th breaker were blocked from turning on because the interlock came down a little low by 1/4". Once resolved, it seems to work fine.

I purchased this at the direction of my electrician. While I agree with a prior reviewer that the price seems steep, Amazon’s price is 30% cheaper than my electrician’s supplier. Overall it is a bargain compared to the cost of a separate transfer switch & it satisfies code. The construction is extremely solid & it fits my 30 year old box like a glove.

I’m an electrical contractor and have purchased many different style interlocks from interlocks.com and found them all to be great quality and easy to install. I just recently ordered and had to cancel and the process was handled quickly and professional. Great manufacturer and great seller

Everyone quit bitching about the price. It's a quality piece and not something that's available nearby for my older Square D box. Installs easily and works perfectly. Worth the peace of mind knowing that I finished my generator hookup correctly and legally.

This is the most economical method to back feed your electrical panel during a power outage. But you must understand voltage and amperage loads or you could overload your gen set. You must have a qualified electrician install this and explain how to not overload generator.