The fuses tag has no wiki summary.
2
votes
1answer
94 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 ...
2
votes
5answers
785 views
How does a fuse blow at its current rating, regardless of voltage?
I know from reading elsewhere that it's safe to use a fuse with a higher voltage rating when replacing one, so long as the current rating and reaction speed is the same.
For example, if a fuse is ...
2
votes
3answers
207 views
How do glass tube fuses work?
This may be the an unspeakably stupid question for an electrical/computer engineering student to ask, but I ran across a few parts I didn't recognize (which, after some research, I found out were ...
3
votes
1answer
81 views
Question regarding fuses
What is the difference between thermal fuse and MOV and polyfuse.Which is faster and also which companies produce polyfuse, especially in Asia.
I have to search for a component that can save my ...
3
votes
2answers
617 views
How do I measure startup/inrush current?
I have some small devices that draw 20mA. I'd like to add a resettable (PPTC) fuse to them but I am not sure what value to select.
My thought is I need to find a value that will tolerate the startup ...
-3
votes
1answer
121 views
Which fuse and LED should be used for a no contact testing screwdriver? [closed]
I'd like to make my own testing screwdriver based on an existing one which has 2x LR41 batteries, a 2.2Mohms resistor, a KSP13 Darlington transistor, a 5x15mm fuse and a red LED. It works for ...
3
votes
1answer
202 views
Why use a double fuse for a relay-controlled heater?
After this question, another refrigerator "mistery" :-)
This is the schematic of a no-frost refrigerator that I had to fix because the no-frost system failed and a huge quantity of ice clogged the ...
5
votes
3answers
404 views
Replacing SMD Fuses without access to schematics
I'm curious to know if there is a sane way to determine the specifications of a blown SMD fuse without resorting to manufactures schematics / repair manuals.
In my particular case there are no ...
2
votes
4answers
166 views
Overload protection for battery
My 6-year-old son has shown some interest in electronics, and I thought I'd get him some basic components (motors, LEDs, buzzers, etc) and let him experiment (using alligator clips and the like -- no ...
1
vote
2answers
205 views
Repeated fuse-blowing in domestic appliances [closed]
I'm having to take a retailer to small claims court because an expensive (domestic) sewing machine I own keeps blowing an internal fuse and he's refusing to fix it.
His contention is that internal ...
3
votes
3answers
412 views
Why are polyfuses so big?
Why are polyfuses so big? I was looking at a 500mA polyfuse, it is in an 0805 package, but there was only one of them - the rest were 1206. I have two questions.
Why so big?
Does anyone make 0603 ...
7
votes
3answers
656 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.
...
1
vote
4answers
2k 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
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 ...
2
votes
3answers
590 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 ...
-2
votes
1answer
226 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
5answers
768 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? ...
4
votes
3answers
2k 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 ...
0
votes
2answers
136 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 ...
3
votes
3answers
1k 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 ...
5
votes
5answers
842 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 ...
3
votes
1answer
151 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, ...
3
votes
2answers
347 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
771 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 ...
