They are basically fuses and should blow! LAUGH OUT LOUD. So when a fuse has blown it usually indicates a problem and the fuse worked properly and saved the device and you from further damage. By the way, it's like "Fast Strike". The slow-blow fuse differs from the fast-acting fuse discussed here in particular in its ability to withstand transient surge currents, d as microwave, etc. works fine. Either way, for the price you pay, you get a lot of fuses that will probably last you a lifetime and are good to have on hand when you need them. By the way, if you think you can use these 10A, 15A, 20A: Microwave Replacement Glass Fuses? - Depending on the model of your microwave you can temporarily get away with it in most cases, but more than likely you can blow it up more often than the slow ceramic types that OEMs put in a regular household microwave, but for troubleshooting and temporary use these are well worth the asking price . Good plastic box for tidy storage of fuses. Arrived in good condition, the safety glass is not broken. The Amps letter rating is a little hard to read which may be due to my aging eyes!
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