umery2k75
Advanced Member level 1
I recently had a blown up fuse of 20A.I put it in a new fuse of 20A. After a few hours, I noticed that the fuse got melt, but didn't blown up. I replaced the fuse with a 25A. Still my new fuse got melt after a few hours. I used the clamp meter to check out the DC current flowing. The current was around 15A with a voltage of 12V. I thought maybe there's a short circuit. I opened up all the wiring, I ended up in spending two days trying to figure out any faulty wire. Still I didn't get to any point. I had few other fuses of some other company. I put it in a new 20A fuse of another company. To my surprise, the fuse didn't get heat up nor it got melted. I doubled checked the ampere rating of fuse. It was same 20A. I then hooked up the Ohm-meter to check the resistance of two fuses. If I remember correctly the resistance of two fuses came out to be 0.4Ohm or 0.04Ohm. These were the values and the resistance of two fuses were the same. One was getting hot,melting and another remain cooled. To say in a general word, the fuse was of low quality, but in terms of electricial quantities. How should I express this? Size, plastic cover of fuse, and even the terminal looked samed to me. Resistance came about to be the same.Is there any way, one can judge, whether fuses are of good quality or not? I kept on thinking, there must be some other thing beside the fuse. When it was the finally the problem of fuse.
