The cartridge fuse. Fuses part 3

The cartridge fuse. Fuses part 3

I describe the use and design of the non motor load cartridge fuse. How it works What it is used for.
This video is part of the heating and cooling series of training videos made to accompany my websites: www.graycoolingman.com and www.grayfurnaceman.com to pass on what I have learned in many years of service and repair. If you have suggestions or comments they are welcome.
If you are a homeowner looking to repair your own appliance, understand that the voltages can be lethal, the fuels are highly flammable and high pressures are used. Know your limits.

18 Comments

  1. projectartichoke on October 10, 2022 at 5:38 am

    There are multiple small areas (weak points) inside a fuse for short-circuit protection. Under a typical over-current event one of them will open, but under a short circuit all of them will open and and arcing will fuse the sand into glass which is an excellent insulator and will extinguish the arc.

  2. Bob Heck on October 10, 2022 at 5:39 am

    You are just as good for homeowners! Great Gray Guy!

  3. Jolyon Welsh on October 10, 2022 at 5:56 am

    That silica powder is an arc extinguishing medium. When the fuse opens (always under an overload) the sand fills in the void as the element burns extinguishing the arc. This is why fuses are capable of interrupting higher available fault currents than circuit breakers. They can’t put that sand inside a circuit breaker for obvious reasons. If you haven’t noticed, fuse have a higher available interrupting rating (A.I.R.) than breakers.

  4. mei ZOU on October 10, 2022 at 5:57 am

    more fuse body material as melamine , vulcanized fiber , epoxy fiberglass tube on fusetube.com,wellele.com

  5. grayfurnaceman on October 10, 2022 at 5:58 am

    Sounds probable to me. Thanks for the comment.
    GFM

  6. Milosz Ostrow on October 10, 2022 at 6:01 am

    Yes, those cartridge fuses are available in ratings larger than 60 amperes. My parents owned a house built in the mid-1950s that had a couple of large, 70A cartridge fuses for the mains protection.. Since they were installed in a Cutler-Hammer enclosure rated at 100A with appropriately sized bus wiring to the sub-panel containing the branch circuit breakers, dad eventually replaced them with 100A cartridge fuses, as he got tired of replacing burned-out fuses. Nowadays, I would consider replacing the mains fuses with a dual circuit breaker, since the fuses can cost $18-$20 each and a major overload event on a 220V appliance circuit that blows both fuses could end up costing $40, whereas it would just be a minor inconvenience having to reset a tripped breaker.

  7. Energy Fabricator on October 10, 2022 at 6:05 am

    I think they have more than one weak spot to evenly distribute the current across the fuse. This way, the heat is more evenly distributed throughout the fuse. If there was only one weak spot, it could overheat prematurely and alter the current carrying capacity of the fuse, bringing it out of spec. Just my guess…

  8. Andrew Garratt on October 10, 2022 at 6:06 am

    Is there like a 2 or 3 time use cartridge fuse?….mine went out,I took it out flipped it around…did not expect for it to work! But prayed hard because it’s New Year’s Eve everywhere is closed!
    Miraculously it’s working !?
    I don’t understand how this is possible.

  9. Geo Synchronous on October 10, 2022 at 6:11 am

    Three break points on those old fuses is a three step redundancy fire protection precaution

  10. SeñorMonkeys on October 10, 2022 at 6:12 am

    Do you think i can replace a cartridge fuse and wiring with a automotive fuse? Cartridge fuse is off a old 4 wheeler.

  11. nextplease518 on October 10, 2022 at 6:12 am

    Maybe there is three so that when it blows, you can see which side of the load made it blow? Just a guess tho

  12. Fpo Oat on October 10, 2022 at 6:17 am

    Thank you.

  13. Seemore Butts on October 10, 2022 at 6:23 am

    Thank you for this video. I am just going to add to it to help other homeowners since it is old and the only one that I can find. It won’t "burn in two" like you said, the metal will melt from high heat created by more resistance than it can handle. But some times, the metal in these fuses gets old and won’t transmit or allow as much amperage flow even though you get a proper voltage reading. It’s like with water, you can have 100 psi (pounds per square inch) build up through a pinhole. But you will not have as much volume through a pinhole as a 1" diameter pipe.

  14. Mr. I Forgot on October 10, 2022 at 6:24 am

    I git by her today dinner

  15. Clem's on October 10, 2022 at 6:24 am

    Actually there is a more involved reason for three separate elements. The fuse has three jobs to do..Heres a good read : http://electronics.stackexchange.com/questions/25055/slow-blow-vs-fast-acting-fuse

  16. Qaisar Hosanee on October 10, 2022 at 6:25 am

    Is that what we call a fuse type gG?

  17. JON Gergeceff on October 10, 2022 at 6:25 am

    Excellent content

  18. Matthew Wood on October 10, 2022 at 6:26 am

    The sand is to quench electrical arcs when the element melts (i.e., fuses). Here is the description from Fuseco’s site: "Current limiting fuses contain a granular filler, usually high purity quartz sand of a defined grain size and packaging density. The specific grain size distribution provides room to expand for the vapours and gases produced by the arc and offers a large surface for efficient cooling. The filler does melt under the influence of high arc temperatures, absorbing an enormous amount of energy and extinguishing the arc well before current zero. Fused quartz and metal form a non-conductive fulgurite body that prevents re-striking of the arc."

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