Nope not different in any way, "contactor grade" is just a fancy way to sell products at home improvement places, it's a sales gimmick. The powerlock there is no different that what you buy anywhere else, this model is the older model of powerlock without the gear covers, the new 2.0 has the covers on it. I got both my Flash II and my Twitch II from Lowes and they both said contractors grade on them and they are no different than the original products you buy from anywhere else. Hope this helps