As a result of using this industrial and scientific product, I found that it provided excellent protection against electrical surges. The 20MM size was perfect for my application and the fuses were easy to install. The fast blow feature ensured that my system was quickly protected in case of overloading. However, the only drawback I found was the pricing AS they are slightly more expensive than other options in the market. Overall, I would highly recommend this circuit protection solution for its reliability and effectiveness. .