We purchased a set of protectors for our industrial electrical circuits and were highly disappointed with the results .Based on our own experience we found these protectors to be ineffective and unreliable. The only upside was that the transparent design made it easy to identify which circuits were protected. Unfortunately, the cons far outweighed this lone pro as the protectors failed to waterproof our circuits as advertised. Overall, we would not recommend this product to anyone looking for quality circuit protection in the Industrial and Scientific field..