I was very glad they exist and ordered both sizes of the 30 amp version. After reading the instructions, I discovered an unpleasant disadvantage of these devices. According to the instructions, you can't use them for more than 10 seconds, otherwise they will self-destruct. It might be cool in Mission: Impossible, but don't try to fix intermittent issues. You may have an application where this isn't a problem, but to me it makes them pretty much useless.
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