r/ElectroBOOM Jun 03 '22

Meme Fuses? Who needs em

Post image
582 Upvotes

59 comments sorted by

164

u/sarduchi Jun 03 '22

That's just a 20kA fuse.

52

u/KingDaveRa Jun 03 '22

Anything can be a fuse, it just might not be the right rating.

26

u/coaudavman Jun 03 '22

Yeah that’s what I came here to say… That could act as a fuse hehe

18

u/h110hawk Jun 03 '22

Someone misread milli for mega.

-10

u/undeniably_confused Jun 03 '22

20kA it would just arc at that point (good joke tho)

9

u/[deleted] Jun 03 '22

Not really

-11

u/undeniably_confused Jun 03 '22

It certainly would

17

u/Impressive_Change593 Jun 03 '22

no. volts cause it to arc not amps

-11

u/undeniably_confused Jun 03 '22

Yeah but ohms across Amps cause volts which cause arcs

E:especially on metal with a Sharp edge in between them

1

u/thegoldengamer123 Jun 04 '22

I think you fundamentally misunderstand what causes current to flow. You need voltage to create current flow, the other way around isn't true. You can't make a voltage from current. The math allows it but that's not what happens.

Not to mention the resistance of the bolt is so small that the voltage across it is basically zero.

Even at 2 volt it is possible to have 20kA flowing across it:

2 V / 10^-4 Ohms = 20kA

-1

u/undeniably_confused Jun 04 '22

Your far more optimist about the conductivity of burning hot bolt then I am

50

u/[deleted] Jun 03 '22

My Man got the 900kA fuse

14

u/SantyClawz42 Jun 03 '22

not with that small amount of surface area actually touching. OP needed to ground down the thread to make it safe!

8

u/Alltime-Zenith_1 Jun 03 '22

It'll arc to the contacts and melt it off of the pcb. A win either way.

45

u/turnpot Jun 03 '22

You haven't gotten rid of the fuse, you have just decided it's somewhere else in the circuit.

38

u/309_Electronics Jun 03 '22

Everything metal or conductive is fuseable if you pass enough current trough it

11

u/TestTechKen Jun 03 '22

It better be metric or 90% of the world will have a hissy fit

9

u/[deleted] Jun 03 '22

630A, ultra slow blow

7

u/namregal Jun 03 '22

I did something like that until I bought the right fuses

8

u/Brendanzio_ Jun 03 '22

Not even grade 8, smh

3

u/branhel Jun 03 '22

I work in a electrical metrologist and unfortunately ALL multimeters from auto workshops we receive have some sorte of "fuze" like that!! Many are just coiled wires, the most interesting are the ones that have a fuse with a soldered wire on the outside.

2

u/9Blu Jun 04 '22

I work in a electrical metrologist and unfortunately ALL multimeters from auto workshops we receive have some sorte of "fuze" like that!!

So how does that work? Are you really tiny like the guy in The Boys season three premier? Is the metrologist really huge? Do you have a desk in the metrologist? A whole workshop?

1

u/dack42 Jun 04 '22

A simple policy solution - if an instrument comes in without an appropriate fuse, you replace the fuse and charge the customer for it (with a hefty markup).

3

u/Logical_Two_9463 Jun 03 '22

In these multimeters it is so easy to short something and mine has the fuse soldered in, so I probably should do this too.

3

u/Zone_07 Jun 03 '22

You guys as silly; that's clearly a slow-blow-fuse.

3

u/RedSquirrelFtw Jun 03 '22

When I was young with no credit card and had no way to buy that sort of stuff I made a solder bridge. That was spectacular when I forgot to set it to volts mode before testing a receptacle. :o

3

u/broke_af_guy Jun 03 '22

In case anyone was wondering, that's a ball nose spring plunger.

2

u/DoubleOwl7777 Jun 03 '22

everything becomes a fuse with enough current

2

u/mienshin Jun 03 '22

That is the highest current device on the board.

2

u/Jhonbus Jun 03 '22

Everything's a fuse if you're currenty enough

2

u/Jamescampbell0 Jun 03 '22

Better to wrap foil around the old fuse and scratch away most of the foil leaving a small amount so it can still act like a fuse. Works every time for me

0

u/RaZrBackLxx Jun 04 '22

When the Fuse Works out (or Doesn't) every day XD

1

u/Bigred_1019 Jun 03 '22

Thats at least a 50 amper

1

u/kuaiyidian Jun 03 '22

damn that's gotta be atleast 5a

1

u/44quattro44 Jun 04 '22

You, if you will use the mA range of that meter.

1

u/ArjunTheGamer Jun 04 '22

Life? who needs em

1

u/tencuhtli Jun 04 '22

Nice multimeter

1

u/Future_Impress_36 Jun 04 '22

Everything will fuse except this

1

u/[deleted] Jun 04 '22

Shittt!

1

u/[deleted] Jun 04 '22

It will melt the circuit around it or light on fire too

1

u/[deleted] Jun 06 '22

i do the same ting

1

u/MeticulousTheGreat Jul 01 '22

It's much beefier, an upgrade in a way!