Questions tagged [fuses]

Questions regarding physical fuses. Fuses are a safety device consisting of a strip of wire that melts and breaks an electric circuit if the current exceeds a safe level. PPTC, PTC, and Polyfuse questions should use the Polyfuse Tag. Please keep in mind that repair questions are typically closed if not within the scope of the Site and FAQ.

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7
votes
3answers
5k views

Cooper Bussmann's screw-in Edison-base mini breakers aren't for inductive loads. What does “inductive” mean?

I'm thinking of buying some Edison-base screw-in miniature circuit breakers to replace some of the fuses in my house. There are some made by Connecticut Electric and some made by Cooper Bussmann. ...
7
votes
1answer
3k views

Resettable Fuse: Do they have a “Reset” limit?

Sorry for the confusing question, but for PTC's or Resettable Fuses such as something like this: http://www.sparkfun.com/products/8357 Is there a "limit" on how many......I guess "resets" it can ...
-3
votes
1answer
808 views

What Fuse Is The Correct Replacement?

I got a HP Universal Counter on my desk, but it did not turn on, so I checked the fuse. The original fuse reads SOCSD4 D250V150mA What kind of fuse could I use ...
3
votes
2answers
5k views

How do you use a fuse with a rating of Amp-Hours?

Sorry, this may be me being slow, but... An amp-hour is 1 amp over 1 hour - simple enough. Now I have 2 fuses - one is rated in amps, the other in amp-hours. Can I I use one in place of the other? ...
2
votes
1answer
124 views

Computing ampacity a of small fuse from change in temp on breakdown

I'm trying to design an experiment for an entry-level electronics course involving burning out fuses of an unknown rating and determining their rating by the temperature they were when they failed. Is ...
10
votes
5answers
152k views

Why does fuse blow up sometimes?

Sometimes once in a year, either one of main fuses or a fuse in room blow up due to something. What is the cause of this? Why do we even use fuses? Is it because the voltage doesn't stay at 220V all ...
1
vote
1answer
11k views

Are thermal fuses polarized?

I have a device with a thermal fuse in it. The fuse has failed, and I would like to replace it. Does thermal fuse have a polarity, similar to an electrolytic capacitor, or is it the same with normal ...
11
votes
3answers
13k views

Should I use slow fuse or fast fuse?

When I design something or going to add a fuse to place where fuse isn't used now, should I prefer slow or fast fuse? I understand that this depends on situation, but I'd like to hear what do you ...
30
votes
6answers
217k views

Slow Blow vs Fast Acting Fuse

Is there any way to tell the difference between a slow blow and a fast acting Fuse? I had one blow in my amp and I know its 125v 5a, but i'm not sure if it is a slow blow or fast acting fuse. Is ...
0
votes
2answers
194 views

Identify a fuse part

I'm trying to identify a fuse part that says 125V T 2A on it. It seems to be a solid state fuse soldered in place. IE I can't just snap in another replacement fuse in a glass tube like I'm accustomed ...
2
votes
2answers
2k views

Do fuse blow on ampere or effect?

I have a faulty car (bad central locking engines) and a fuse is blowing every time I open/lock the it. I'm looking to do a quick fix, and just replace it with an automatic fuse. The car runs on ~12V, ...
11
votes
4answers
7k views

Fuse blowing in 12 multimeters rated for 200mA, only measuring 12.5mA. Why?

I'm a high school electronics teacher and while doing a lab on Ohm's Law we just blew the fuses in 12 out of 18 brand new digital multimeters while measuring current, and no the meters were not hooked ...
4
votes
3answers
3k views

How can I design a robust and professional power supply circuit?

I'm planning on doing a large project that would include an ARM microcontroller @ 50 MHz interfacing with a graphic LCD, user buttons, some sensors and some actuators (DC motors, valves) controlled ...
13
votes
4answers
14k views

How do I choose a fuse? Fusible Links vs Polyfuse?

I realise this is an extremely broad subject area but I need to know how to choose a fuse to protect a circuit. Recently, a cheap PSU of a friend's blew up quite spectacularly (the two primary ...
5
votes
3answers
529 views

Are PTC fuses called some other way?

I recently learnt about the existence of PTC fuses, and I'd like to use one for an USB power supply I'm building. I guess there are PTC fuses on the PC side, but you never know. I went happily to buy ...
1
vote
2answers
630 views

My power supply tripped the RCD

I also posted this at All About Circuits but I thought I would get some more opinions as I'm quite worried. I was using my power supply to power an electronics project (Super OSD.) The power supply ...
6
votes
6answers
3k views

Is it possible to quantify electric power consumption on a fuse?

If you have a common fuse is there way quantify the power consumption which is flowing through this fuse. Or could you replace the fuse with something that measures the power consumption but still ...
8
votes
6answers
20k views

what size of copper wire can act as a 150A fuse?

If I would like to use a piece of copper wire as a 150A fuse, what size of wire should I use? It doesn't have to be 150A very accurately, the parameters I need the wire to meet are: it needs to ...
3
votes
1answer
222 views

How can I protect the amplifier behind a headphone jack when interfacing with external circuitry?

I am wanting to mess with the output of my guitar amp. Not actually opening it up, just taking the headphone-output and connecting it to a breadboard and such. What form of protection, if any, ...
7
votes
3answers
9k views

When should you use a fuse?

When is it actually practical to use a fuse? Like lets say your building a robot using an Arduino.....what area would you want to protect the most with a fuse? I mean do they even make fuses that ...
4
votes
2answers
958 views

Designing with fuses…when to use?

Most circuits that I have designed in the past deal with low voltages...sensors, communicating with other chips, etc. When would I need to consider the addition of fuses into my designs? Sometimes I ...
3
votes
4answers
3k views

Need help debugging my project: Fuses popping like crazy, but I can't find the reason why

I recently made a voltage and current controlled supply from a kit I found. It worked for about 15 minutes and then fuses started popping. Unfortunately, I have no idea why, because power supply ...

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