Why is the Victron Cerbo GX (MKII) shipped with a 3.5A 250 Volt fuse?
There is a more complicated answer here. But put simply… (Hopefully not too long winded)
Fuse ratings don’t really change with voltage (with the exception of arc quenching and other factors); a 1A fuse will blow at 1A regardless of ac or dc voltage since it is the heat generation caused by current over the fuse that causes it to blow (not the voltage.)
An example is mersen fuse disconnects if you read the datasheet you will find they are certified and used in both AC and DC circuits however because of arc quenching the voltage of the DC circuit must be significantly lower than the AC rating.
Since there is a 250AC fuse on a circuit expected to run less than 72VDC the fuse is safe. (And easier as an end user to replace).
Another factor is whether is is slow blow or fast blow.
1 Like
Excellent explanation. Just what I needed.
FYI. I had yet to verify the draw with a Touch 70 connected and it seems marginal. Just a few Watts, Fully acceptable.
Thanks mate 