12 Dec
2012
12 Dec
'12
10:59 a.m.
Are these by default 250v? Thats all Radio Shack sells. I dont recall there being a
voltage rating on the old ones.
12 Dec
12 Dec
11:58 a.m.
That rating is for UL purposes. The amount an open fuse air gap can
reasonable be expected to be an open circuit. The current is all that
really matters unless you go to a higher voltage, or have other issues
(such as transient high voltage which might cause an arc to start, then
sustain at a lower voltage).
Also FWIW, I think it is an RMS voltage rating they used.
household cartridge fuses are typically 600v.
I worked at Bussman testing fuses, and the reason the 600v was there was
mainly that was as high as their test rigs could go from the power
sources they had. Most of the circuits they are used in are way lower
than that.
jim
On 12/12/2012 10:59 AM, Chris Tofu wrote:
Are these by default 250v? Thats all Radio Shack
sells. I dont recall there being a voltage rating on the old ones.
3:22 p.m.
On 12/12/2012 10:59 AM, Chris Tofu wrote:
Are these by default 250v? Thats all Radio Shack
sells. I dont recall
there being a voltage rating on the old ones.
I've seen AGC3 fuses for automotive use rated at 32V, but I've never
seen a GMA fuse rated at less than 250V. I've sometimes wondered if the
AGC3 voltage rating was for marketing purposes.
Anyone know for certain if there's a reason to purchase a 32-volt AGC3
over a 250 volt one?
--Chuck
13 Dec
13 Dec
2:54 p.m.
From: Chuck Guzis <cclist at sydex.com>
On 12/12/2012 10:59 AM, Chris Tofu wrote:
Are these by default 250v? Thats all Radio Shack
sells. I dont recall
there being a voltage rating on the old ones.
I've seen AGC3 fuses for automotive use rated at 32V, but I've never seen a GMA
fuse rated at less than 250V.? I've sometimes wondered if the AGC3 voltage rating was
for marketing purposes.
Anyone know for certain if there's a reason to purchase a 32-volt AGC3 over a 250 volt
one?
--Chuck
C: My guess is since it's a 12 volt system, utilizing 250 volt fuses might make them
more "durable", less prone to blow (given they're primarily intended for 120
volt environments). But hey I'm the one asking the questions.
12 Dec
12 Dec
12:03 p.m.
Other useless data on Buss fuses anyway, I always assume they will run
forever at 100% overload, and blow immediately on any spike of 10X over
rating.
IE if you have a 5x rated spike you might not get a blow.
Slow blows fusetrons are very precise but temperature sensitive. they
will bake the solder in the mechanism for a very precise time if the
current heats it to there and then release and open the slow blow half
of the mechanism. If they are operated in the 150F + range, then you
get enough heat into the fuse to make it blow sooner.
The solder they use I tested with a temperature rig would run 500 test
plugs for the rated time, and then all blow typically within 1 to 2
seconds of each other.
that test is done on every batch of the material. I don't know what
they do now in ROHS (or whatever it is) non lead times. I think there
was even gallium and indium in the alloy they used. Pretty exotic stuff
anyway.
Jim
On 12/12/2012 10:59 AM, Chris Tofu wrote:
Are these by default 250v? Thats all Radio Shack
sells. I dont recall there being a voltage rating on the old ones.
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