fuse holder watts

Using Arduino General Electronics
1

Hi there,

I'm designing a board that will be powered at max 18V and will consume about 300ma

I want to add a fuse, but since I have small spaces I want to go with TR5 fuses (a 400ma FA), and with this fuse holder: https://www.littelfuse.com/~/media/electronics/datasheets/fuse_holders/littelfuse_fuse_holder_559_560_datasheet.pdf.pdf

Now the fuse holder pdf above says max power 1.6W and max current 6.3A .. does this mean that It is not suitable since the board draws about 6W ? Note the conducting path 0.1mm²

Thank you,
Robse

2

Hmm. It's not clear is it? I expect the fuseholder's wattage is in respect of the power dissipated by the fuse itself. If you have something other than a fuse inserted in that holder (maybe you're using a resistor for testing) then you want to keep its power dissipation under 1.6W.

Of course a fuse and the connections to the fuse have an unavoiable resistance, which will dissipate heat. This heating will be insignificant for your application.

3

MorganS:
Hmm. It's not clear is it? I expect the fuseholder's wattage is in respect of the power dissipated by the fuse itself. If you have something other than a fuse inserted in that holder (maybe you're using a resistor for testing) then you want to keep its power dissipation under 1.6W.

Of course a fuse and the connections to the fuse have an unavoiable resistance, which will dissipate heat. This heating will be insignificant for your application.

In fact resistance for the 400ma fuse is 0.1610 ohm .. so if P = I²R the power dissipated is about 0,015W

Thank you !
Robse

4

There are also light bulbs that fit into tube sockets, and a wattage limit for those would make sense.