Littelfuse BLF15A fast-acting midget fuse intended use

Power Circuit Protection
1

Hi
ref : Digikey product # F5054-ND
0BLF015.T Littelfuse Inc. | Circuit Protection | DigiKey

I wanted to know where would this type of midget fuse (Littelfuse BLF 15A @ 250V interruption rate10ka fast acting) would be used in a typical household or household items. I found this on my father’s desk all of a sudden but he has Alzheimer’s and can’t remember if he removed it from somewhere or found it in a drawer or what. He doesn’t go out so it’s from the house.

Littelfuse
Littelfuse173×218 16.4 KB

Thank you so much

2

Hello,
Welcome to the DigiKey TechForum. The description from the datasheet lists The KLK series fast-acting fuses are designed specifically for the protection of control circuits, street lighting, HID lighting,
computers, and other applications without high in-rush currents. I think we can eliminate street and HID lighting. Beyond that does he have a computer or any medical equipment, have you noticed anything that isn’t working, if it was removed from something that device shouldn’t power up.

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Hello @Jazzy,

Very sorry to hear about your father, Alzheimer’s is heartbreaking journey for both of you.

Your fuse is general purpose. From a residential perspective:

  1. Likely too small for primary fuse box - most house have been retrofitted with circuit breakers.

  2. Potentially from a heat pump or furnace.

It’s possible that the fuse came from somewhere else. Perhaps something he picked up in the last decades.

With winter approaching, be sure to test the home’s heating unit(s).

Tank care of yourself and your father.

Sincerely,

Aaron

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I’ve never seen any personal computers in my life with a fuse and that’s because a computer’s power supply has a fuse but not that type of fuse it would be one with to leads that get soldered onto the board. No medical equipment. Still looking. APDahlen has pointed me in a plausible direction.
Thanks for responding.

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Thank you so much for your kind words.

Indeed not the fuse box, it’s a 1990’s house with breakers. Thermo-pump is working already, water heater too. Maybe a sump pump? Only other thing I can see is a powercord-caddy that has a reset button on the plug which is 3 inches long. I’ll see if I can open it but I’d guess more of a 10A than 15A. Where is Sherlock when you need him. LOL

Thanks again. Take care and be safe.

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If any appliance repair/installation techs have visited the house in the past year or so, the fuse may have fallen out of their toolbox/belt and was only found now.

At least we know that a removed fuse makes any device it was in completely safe.

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Thanks for your response

I live with them and I dealt with techinicians here but it still could be but I’m pretty sure I would have seen it on the floor and it has been a while since we’ve had any. Indeed though many possibility.

But did you say that a removed fuse makes devices safe? Didn’t you mean unsafe?

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With a fuse removed the device can no longer turn on, so it’s safe.

The whole point of fuses are they remove themselves from the circuit to make the circuit safe during a fault.

The only unsafe thing is taking out a fuse and replacing it with a wire.

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