2006-12-13 20:15:21 · 14 answers · asked by adrian w 1 in Science & Mathematics ➔ Engineering
Fuse capacity should depend upon the current drawn by the circuit and NOT the potential difference.
A 1 amp fuse will blow if 1 amp or more flows through it for a specified period of time. The rating of the fuse should be more than the peak current drawn by your circuit operating normally such that the fuse will only blow if there is a fault condition.
Since the current requirement in your case is 0.8 A which is less than fuse limit which is 1A.
But the difference is quite small only 0.2 A.
So you can use that fuse but be CAUTIOUS.
2006-12-13 20:19:08 · answer #1 · answered by Som™ 6 · 0⤊ 1⤋
I really can’t believe some of these responses. I check out the cultural notes and they're kind of fun with everybody’s opinion but this type of advice could get somebody injured.
The 1 amp rating is for current supplying the load. The 12 Volt rating (capital V designates DC voltage) has nothing to do at all with the amount of voltage that the fuse can handle. It designates that if this fuse “blows” that it will take more than 12 volts to arc across the open circuit. Putting a 1 amp, 12-volt fuse into an 800ma, 240-volt circuit would be like putting no fuse in at all; you may as well stick in a penny or a nail. The potential voltage would cause arcing across the open fuse, this could at the very least be damaging to the equipment and at the most be dangerous to life and property.
2006-12-13 21:10:30 · answer #2 · answered by Anonymous · 2⤊ 1⤋
As far as the fuse is concerned, the voltage is largely irrelevant. Only the current specification matters, (well also the speed at which the fuse blows). Although as one anwerer mentions, the voltage specification relates to the arcing potential after the fuse blows.
A 1 amp fuse will blow if 1 amp or more flows through it for a specified period of time. The rating of the fuse should be more than the peak current drawn by your circuit operating normally such that the fuse will only blow if there is a fault condition.
If your 240v circuit is drawing 0.8A nominally, then a 1A fuse will probably blow any time there is a current surge, e.g. at switch-on.
You should use something more like a 3A fuse.
If your 240v circuit is specified to require 0.8A fuse protection, then a 1A fuse will do just fine.
Hope this helps.
Cheers.
2006-12-13 22:23:40 · answer #3 · answered by chopchubes 4 · 0⤊ 1⤋
No. While the Amp rating is enough, the voltage rating is terribly inadequate. Fuse ratings not only depend on the maximum amps it can safely interrupt but also the maximum circuit voltage in which it can be used. The latter requirement is needed because of electric arcing, where current continues to flow through otherwise nonconductive material. A 240V circuit would continue to have damaging and potentially dangerous current flow even after the 12V fuse is blown due to electric arcing.
2006-12-13 20:42:46 · answer #4 · answered by djiang83 2 · 0⤊ 0⤋
A fuse has negligable resistance, so the voltage rating does not make any real difference - in fact I dont think you will find a normal wire fuse with a voltage rating (if you're talking about semiconductor fuses, thats another matter)
the important rating is the current rating - 1 amp.
does the 240v circuit actually draw 0.8 amps? If so, I wouldn't use a 1 amp fuse to protect it, it is too close to the current.
rememebr all devices have a tolerance and a rating of '1 amp' may mean anything between 0.8 amp and 1.3 amps.
2006-12-13 20:25:59 · answer #5 · answered by Vinni and beer 7 · 0⤊ 1⤋
Yes, as mentioned if you have #12/12 guage/awg 12 and hopefully all three wires you can put a 20 amp overcurrent protection device on the circuit with the one caveat being that at the bare minimum you have at least 1 20 amp receptacle or a divided load and if you really want to be smart about it (or depending on what interpretation of which year of the NEC you are going by) you use 20 amp receptacles throughout the house. Circuit Breaker AMPS = Wire size, length, and temperature AMPS = receptacle AMPS. Follow the circuit. I'd upgrade everything and make sure nobody cheated on the grounds anywhere.
2016-05-24 00:44:28 · answer #6 · answered by ? 4 · 0⤊ 0⤋
Not safely. If it blows, it will probably arc over and continue to feed power to the faulty circuit. But a 240 volt fuse will work fine on a 12 volt circuit.
2006-12-13 20:19:49 · answer #7 · answered by Anonymous · 1⤊ 0⤋
Standard fuses are rated at current drawn, not voltage.
Other types of fuses, ie. Thermal would be dependant on such things.
2006-12-13 20:38:28 · answer #8 · answered by Daedalus 3 · 0⤊ 1⤋
no,
the circuit will not be able to be used, as the quick melting fuse would constantly need replacing as soon as the circuit was turned live..... unworkable
2006-12-13 20:20:10 · answer #9 · answered by Bmp1ksh 3 · 1⤊ 1⤋
you can connect 20 12v fuses in series for 240v protection
2006-12-13 21:39:45 · answer #10 · answered by uni_sid_mtv 1 · 0⤊ 4⤋