nicklink483
15.05.2021 2:53:36
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So, if we are to compare a fuse with a 125 volt AC rating to one with a 12 volt rating, the 12 volts has to be AC as well. Which of course, won't happen, but we do have lot's of 24 VAC to work with. [links]
So if a 250V fuse were used for 24 volts there wouldn't be that arc situation so would the fuse work effectively
The voltage determines the amount of arc over and the type of material the insulating part of the fuse is made of (Like glass, plastic or fiber).
What I do notice is on dual rated fuses, the DC rating is always much lower than the AC rating, so in addition to the above, we must consider the zero voltage cross point. That said, a fuse designed for 120 volts AC may blow at a different current rating at 12 volts DC, not due to the lower voltage, but due to the lack of a zero voltage cross point. [links]
It's a 45kW VSD panel. About half way down on the left hand side is a 100A ABB fuse switch. For scale, the trunking above and below is regular 40mm stuff - less than two inches. more
No. I am saying that a 250 volt fuse might have a longer link than a 24 volt fuse, and also have more solid heat sinking of the ends (not by design though)
You can always put a higher voltage rated fuse in a circuit but the amperage myst be the same. You should NEVER put a fuse with a lower voltage rating in circuit with higher voltage circuit. You need to be careful about instant acting and time delay fuses. The DC fuse would not protect well in an AC circuit. [links]
Yes, very important! The voltage rating of the selected fuse must be greater than or equal to the circuit voltage. Since fuses have such low resistance, the voltage rating becomes critical only when the fuse is trying to open. They can however be used satisfactorily in circuits at lower voltage levels.
what kind of fuse do I need for 12v? There are 3 types of 12v fuses I recommend. They are Spade Fuses, ANL fuses, and Re-settable Breakers. Spade fuses are the fuses that you'll commonly find in your car's fuse panel and are typically for items run out of your distribution block and less than 30 amps (in our case.
Will a 250v fuse work for 125v? [links]
People also ask, can I use a DC fuse on an AC circuit? more
The 250V fuse can sustain a higher voltage before it arcs over. So yes, you can use a 250V fuse in place of a 125V fuse as long as the current rating is the same.
In simple terms, whenever a fuse 'blows', the resulting gap in the melted element must be great enough to prevent the voltage across that gap from maintaining or re-igniting the resulting arc. So, in addition to their current rating, fuses are also rated according to the voltage at which they are designed to operate. [links]
So, if you were to use a 32-V fuse in a 250-V circuit, it is likely that it will not be able to extinguish the resulting arc when the fuse operates, and the circuit will not be protected properly.
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