Hi Pat,
About the voltage rating on fuses,
As I understand it. When a fuse blows (opens), a gap is left between the
ends of the fuse. So for example, a fuse rated at 250 volts would require a
voltage in excess of 250 volts to jump the gap left by the blown fuse.
This is why you would not want to put an automotive fuse rated at 32 volts
in a 120 volt circuit but you could put a fuse rated at 250 in a 12 volt
circuit without a problem.
I hope this is not too confusing.
73's
Howard #3,
W A 9 Y B W
----- Original Message -----
From: "Pat Byrne" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, May 21, 2012 8:02 AM
Subject: Re: need source for 12-amp round AGC fuses
>I have always been confused by current/voltage fuse ratings. One amp
> at 12 volts is 12 watts. 1 amp at 220 volts is a whole lot more. Or
> is an amp just an amp regardless of fuse voltage ratings? I'm
> guessing that is how it works and seemingly a ham rig would have a 12
> volt rated fuse.
> thanks for helping this old guy's confusion!!
> pat, K9JAUAt 05:48 AM 5/21/2012, you wrote:
>> Howard:
>>
>>I believe the fuse is a 250-volt AGC fast-blow fuse with the standard
>>length
>>and diameter you suggest, but will doublecheck.
>>
>>I'll also check at Walmarts, Radio Shack, and our local auto supply store
>>here in town to see if they already have them.
>>
>>If I have no luck, I'll contact you for that Amazon.com link.
>>
>>Thanks for all of the help.
>>
>>73 from Tom Behler: KB8TYJ
>>
>>----- Original Message -----
>>From: "Howard, W A 9 Y B W" <[log in to unmask]>
>>To: <[log in to unmask]>
>>Sent: Sunday, May 20, 2012 10:26 PM
>>Subject: Re: need source for 12-amp round AGC fuses
>>
>>
>> > Tom,
>> >
>> > are these fuses fast blow or slow blow?
>> >
>> > I would guess fast blow.
>> >
>> > Also are they 250 volts?
>> >
>> > The voltage is written on the fuse. Just because they are used in a 12
>> > volt
>> > application doesn't necessarily mean that they are not rated for 250
>> > volts.
>> > You need to go by what is written on the fuse assuming the one in there
>> > is
>> > the original.
>> >
>> > Also, I believe a 3AG type is the same thing if you can't actually find
>> > a
>> > AGC type.
>> >
>> > So I know what you have, is this fuse one fourth inch in diameter and 1
>> > and
>> > one fourth inches long?
>> >
>> > I found these for $1.39 for a box of 5 at Amazon.
>> >
>> > If this is what you want I will send you the link.
>> >
>> > 73's
>> >
>> > Howard #3, W A 9 Y B W
>> >
>> >
>> >
>> >
>> >
>> > ----- Original Message -----
>> > From: "Tom Behler" <[log in to unmask]>
>> > To: <[log in to unmask]>
>> > Sent: Sunday, May 20, 2012 7:49 PM
>> > Subject: need source for 12-amp round AGC fuses
>> >
>> >
>> >> Hi, again, everyone.
>> >>
>> >> This week-end, I put the Tentech Scout that I bought from the recent
>> >> estate
>> >> sale on the air. Made a 20-meter SSB contact to a special event
>> >> station
>> >> in
>> >> Long Island New York. He gave me a 5 by 7, which isn't bad
>> >> considering
>> >> the
>> >> maximum output power for the Scout is 50 watts.
>> >>
>> >> Anyway, in looking over the Scout, I notice that it requires a 12-amp
>> >> round
>> >> AGC fuse in the positive lead of the DC power cord. I have 10 and
>> >> 15-amp
>> >> fuses here, but no 12-ampers, which I believe will be hard to come by.
>> >>
>> >> I certainly wouldn't want to put a 15-amp fuse in there, but could go
>> >> with
>> >> a
>> >> 10-amper, if needed at least in a pinch.
>> >>
>> >> If anyone knows of a good source of 12-amp AGC round fuses, please let
>> >> me
>> >> know.
>> >>
>> >> 73 from Tom Behler: KB8TYJ
>> >
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