Probably a short to ground.
This is the starter fuse I am talking about. It doesn't blow every time. It might go weeks before it blows again.
You can replace a higher rating fuse with a lower rating provided it works with the device without constantly blowing. So try the 30 amp fuse in your lawnmower and if it doesn't blow and the mower works okay, you are fine. If it blows you will have to go back to 40.
What Causes Any Fuse to "Blow?"The cause is what fuses were invented and are used for:to detect and protect against SHORT CIRCUIT conditions, and /or CIRCUIT OVERLOAD conditions.
It will draw over 18 amps and will blow a 15 amp fuse.
7.2kW shower = 32 Amp fuse = 6 mm2 cable size7.5kW shower = 40 Amp fuse = 10 mm2 cable size8.5kW shower = 40 Amp fuse = 10 mm2 cable size9.5kW shower = 40/45 Amp fuse = 10 mm2 cable size10.5kW shower = 45 Amp fuse = 16mm2 cable size
Need to know which 20 Amp fuse is blowing.
Fuse #13 or the 40 amp itm is the only forty amp
The starter is failing.
What is the 40 amp RSI fuse in a Lexus rx 300 fuse box
You cannot because a five amp fuse would blow because the original fuse was seven point five. and a ten amp fuse would not blow quick enough to save or even be safe to use it in whatever you are using it for.
something on that circuit is shorted, the short needs to be repaired.
If you do that the likelihood is that you will blow the 3A fuse quickly. There is a reason why the current fuse is what it is, because it is expecting currents around 80% of 13 A or around 10 A.