NASA marine BM1 battery monitor fuse

[erbster]

Anyone know the type of fuse needed for the NASA BM1? Can't see a rating on the fuse and no reference made to it in the manual. It's not a type I'm familiar with- is it a special type?

Thanks

 

[VicS]

Anyone know the type of fuse needed for the NASA BM1? Can't see a rating on the fuse and no reference made to it in the manual. It's not a type I'm familiar with- is it a special type?

Thanks

The one in the connection to the starter battery with later models is 1 amp. Ordinary quick blow I would guess.

Probably the same!

 

[lenseman]

Anyone know the type of fuse needed for the NASA BM1? Can't see a rating on the fuse and no reference made to it in the manual. It's not a type I'm familiar with- is it a special type?

Thanks

The BM-1 draws 3mA and the fuse in question is a 20mm glass fuse with a rating, as VicS quite rightly states, is a 1Amp standard fuse.

If you unscrew the black fuse holder and look very carefully on the side of one of the end caps, you will see the code "F1A250V". It is a standard fuse.



.

 

[VicS]

In packs of 10 for £2 in Maplin http://www.maplin.co.uk/20mm-glass-quickblow-f-451 Order code GJ90X

 

[VicMallows]

In my experience the original fuse/fuse-holder combination is the cause of many 'weird' problems with the BM-1. I strongly advocate changing it for something with a much more reliable low contact resistance such as a blade fuse+holder.

 

[erbster]

The BM-1 draws 3mA and the fuse in question is a 20mm glass fuse with a rating, as VicS quite rightly states, is a 1Amp standard fuse.

If you unscrew the black fuse holder and look very carefully on the side of one of the end caps, you will see the code "F1A250V". It is a standard fuse.

Thanks for the advice chaps. I saw the code, but didn't know what it meant. The manual mentions a 1amp fuse for a starter battery connection (I don't have one), but not the fuse from the domestic battery. Advice about changing the fuse holder also noted.

 

[VicS]

Thanks for the advice chaps. I saw the code, but didn't know what it meant. The manual mentions a 1amp fuse for a starter battery connection (I don't have one), but not the fuse from the domestic battery. Advice about changing the fuse holder also noted.

As I understand it
The" F" indicates that it is a quickblow type, as opposed to a time delay type which would be "T"
1A means 1 amp
250V is the maximum circuit volts for which it is suitable

 

[erbster]

Now you say it, it's bleedin obvious, but when I was squinting at the tiny digits on the thing....
Thank-you for the explanation