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(Topic ID: 267154)

Never mind the manual, use these fuses...


By undrdog

6 months ago



Topic Stats

  • 8 posts
  • 5 Pinsiders participating
  • Latest reply 6 months ago by undrdog
  • No one calls this topic a favorite

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    #1 6 months ago

    I was shopping fuses at Great Plains because I needed to make up a $5 minimum order so I could get my trimmer for the sound board on Mystic.

    Not being able to find the fuses as stated in the parts book, I sent them an email asking if maybe they had them.

    I was looking for
    10A 32 v
    .75A 250 v
    4A 32v
    20A 32v
    5A 32 v.

    Their response was that I could use 250v rated fuses for all (except the 20 amp, which only comes in 32v rating). Is that kosher?

    I think that Mouser has what I need, but I'd rather get them from Great Plains so I can have a $5 min order.

    #2 6 months ago

    Those will work without issue.

    #3 6 months ago
    Quoted from undrdog:

    Their response was that I could use 250v rated fuses for all (except the 20 amp, which only comes in 32v rating). Is that kosher?

    As long as the circuit is running less than 32v.

    If it's a 110v circuit, then no, a 32v fuse wouldn't be the proper rating.

    #4 6 months ago

    If the originally intended fuse will blow over 32v, why is it safe to use a fuse that won't blow until the load exceeds 250V?

    #5 6 months ago

    Don’t confuse load with current.

    The 20 amp fuse is for GI, which is at 7.3VAC.

    I don’t know why they spec’d a 32 volt fuse for the 43 volt supply.

    I think over time, fuses have become much more accurate about blowing at a certain amperage, not voltage. Blowing at or above a certain voltage, in my opinion, would require some type of voltage sensor or sparkgap. Way too expensive for a pinball machine.

    #6 6 months ago

    The amperage is the critical part, I don't know why the voltage rating even needs to be specified, the fuse is a piece of glass with two copper ends with the fuse link soldered on each end, nothing is going to "arc over" if you put 110 volts on a 32 volt rated fuse.

    #7 6 months ago

    Voltage rating on fuses is entirely independent of the value at which the fuse opens; it's still "this fuse has been manufactured to open at the rated current" regardless of voltage. The voltage rating is the maximum voltage that the fuse is designed to be used at, and has no real bearing on it's functionality. A 3 amp fuse rated at 250V is going to open at 3 amps, and a 3 amp fuse rated at 32V is going to open at 3 amps. The 250V fuse is just manufactured to be more robust, able to withstand being used in a higher voltage circuit, regardless of the current.

    #8 6 months ago
    Quoted from RocketFromTombs:

    Voltage rating on fuses is entirely independent of the value at which the fuse

    Thanks. Very understandable explanation

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