duk2n
Site Supporter
Hi folks,
I had this afternoon a discussion with a colleague about what fuse he would need for a 12v power socket where he plans to plug a 110 watt air pump.
My maths for this are 110w / 12v = 9.16 amp, so he would want a 10 amp fuse.
Then he comes saying that he's going to use an ATO/ATC fuse and they are rated 32vdc, so he bets for a 4 amp ATO fuse ( 110w / 32v = 3.44 )...
I told him to plug that 4 amp fuse to see how it will blow, but unfortunatelly we didn't have one. So we tried with a 7.5 amp fuse and... well, it didn't blow!
Now I'm confused. I still think I'm right and what he needs is a 10 amp fuse, it doesn't matter it is rated 32vdc. In fact, I believe 32vdc is a common automotive standard.
Maybe the 7.5 fuse we used is very slow or it is a faulty one, or my maths are wrong?
Opinions, please
I had this afternoon a discussion with a colleague about what fuse he would need for a 12v power socket where he plans to plug a 110 watt air pump.
My maths for this are 110w / 12v = 9.16 amp, so he would want a 10 amp fuse.
Then he comes saying that he's going to use an ATO/ATC fuse and they are rated 32vdc, so he bets for a 4 amp ATO fuse ( 110w / 32v = 3.44 )...
I told him to plug that 4 amp fuse to see how it will blow, but unfortunatelly we didn't have one. So we tried with a 7.5 amp fuse and... well, it didn't blow!
Now I'm confused. I still think I'm right and what he needs is a 10 amp fuse, it doesn't matter it is rated 32vdc. In fact, I believe 32vdc is a common automotive standard.
Maybe the 7.5 fuse we used is very slow or it is a faulty one, or my maths are wrong?
Opinions, please