fuse help

[grifftech]

I need a .8 -.9 Amp fuse but only have .7 A and .4 A fuses I intend to draw 750 ma continuous can I just bodge 2 .4 A fuses in Parallel

[jeroen79]

And what is your question?
Can't you just buy fuses rated for a higher current?

And besides .75A continuous (average?) current, what would be the peak currents?
They could be much higher depending on what you are powering.

[barry14]

Do not try wiring fuses in parallel.  The inevitable slight differences in resistances of the wiring and the fuses will cause an uneven sharing of the current.  This means the actual current for which one of the fuses blows is unpredictable.

[Psi]

A 0.7Amp fuse will last quite a long time with 0.75A flowing through it.
You need double the rated current to blow it fast.  0.75 on a 0.7 fuse would probably last weeks/months of continuous operation.

The thing that will kill it is inrush current (if your load draws more than 0.75A for a short time at startup)

[Neilm]

Can you find a datasheet for your fuse? If it has the curves on it, you will see how long your fuse will take that current. Some fuses will happily take a 2 times overload for 30 minutes before blowing.

[con-f-use]

Since you seem to be a beginner, be adviced that fuses generally don't prevent components or people from bing damaged. They merely (sometimes) prevent fires and overheating.