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 ...

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43 views

Does the rating of an AC fuse point to the amplitude or rms value of the current?

If one reads 16A on an household fuse. Does that mean that fuse can handle up to 16 ampere rms or 16A amplitude?
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1answer
51 views

Glass fuse - Selection rule

If I have a circuit which have current consumption 100mA, what is the value of the fuse that I have to select so to open (burn) the fuse in the case of a short circuit? There is a theoretical or ...
0
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2answers
46 views

Diazed fuse heat dissipation

To be more precise, I'm interested in the amount of "created" heat during normal operation from a diazed 16 ampere fuse. How hot will the fuse be after delivered 16A in seven hours with the voltage ...
3
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1answer
399 views

What are the technical specifications of Tesla “cell level fuses” one fuse per cell

How do Telsa cell level fuses work? Can they protect against short circuits and internal cell fusing? How is the current distributed throughout so many fuses? A total of 200 amps could pass through ...
3
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1answer
102 views

Using Fuses to Connect Batteries in Series

I would like to create this battery pack, consisting of 13 Samsung ICR18650-26F connected in series. There are balancing leads for balanced charging, and resettable polyfuses connecting all of the ...
0
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3answers
21 views

Using thermal overload protection in AC-DC PWM motor driver circut

i'm having some difficulties with calculating the value of the thermal overload fuse in this circuit. The thermal fuse is used to protect the motor and the circuit behind it. The deal problem is that ...
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1answer
30 views

Fuse Question and Surge Protectors

I am doing a DIY PDU project for my college using an Arudino and I have 8 16Amp relays that are controlled via the board. I want to make some sort of surge protector for it as well. Basically I want ...
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1answer
69 views

What type of fuse should I use for this basic electronics design?

I'm creating a simple Arduino project that utilizes a solenoid and a rotary encoder. I'm powering the entire device with a 12V 5A switching power supply. I want to add a fuse to the design but can't ...
0
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1answer
56 views

Amperage before and after rectification

I recently received a variac variable ac transformer. It is a older model so I decided to modify it a bit. I will add analogue amp and volt meters to show what the "current" out put is(pardon the pun) ...
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1answer
70 views

What component has the reference designator RY?

I found a component designated RY8015 which I don't recognize, shown on the photo below on an LCD TV PCB (the bulb-like part next to a green radial varistor). What is it called? What is its design ...
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6answers
93k 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
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1answer
46 views

Fuse and fuse holder

Intro I am currently working on an e-board. my esc is a vesc, which has the following ratings: Voltage: 8V – 60V (Safe for 3S to 12S LiPo). Current: Up to 240A for a couple of seconds or about 50A ...
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1answer
48 views

would i need a fuse when experimenting with transformers?

I have a 0.7A center tapped 12v/15v transformer(i dont know details about it). However i dont know which pin is which among the output pins, so I have to jump them in many ways and measure with ...
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3answers
61 views

What fuses for 100A, 3-ph disconnects

I've been looking at 3 phase disconnects, and I'm uncertain what the rated amperage means in this context. Since each blade (phase) has its own fuse in a fusable disconnect, does that mean that for a ...
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4answers
130 views

Benchtop circuit breaker

I repair electric appliances and tools. Every once in a while, the main circuit breaker trips when I plug in a device. I don't want to prevent a circuit breaker from doing its job, but I would prefer ...
1
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2answers
81 views

Cannot enter programming mode ATMega328p

I'm using an ATMega328p Xplained Mini development board. I was able to program it using Atmel Studio 7, being new to AVR programming I accidentally set the RSTDISBL fuse to 0 (has a default value of ...
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8answers
1k views

Can I use a 10A light switch with an appliance with a 13A fuse?

I have a vacuum cleaner, which I wish to add a switch to, so that I can leave it plugged in all the time and use the switch to turn it on and off. The vacuum cleaner has a fuse rated 13 Amps. I ...
3
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1answer
63 views

What fuses can I use for branch circuit protection above 600 amps?

My present understanding is that not just any fuse meets the paperwork qualifications of "branch circuit protection". In particular, I want to protect a variable frequency drive, so J-type fuses are ...
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1answer
69 views

what fuse for an electric circuit tester

Cannot seem to get a clear answer on the web. I have a mains tester with a blown 100mA fuse (glass) do I replace it with a quick blow fuse or a time delay fuse. Common sense would say a quick blow ...
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5answers
129 views

Preventing breaking of fuse wire very frequently [closed]

we have two geysers 3kWh each. When we turn on both the geysers, the fuse wire breaks. This happen s quite often and in the same scenario. How to prevent this from happening keeping both the geysers ...
3
votes
5answers
338 views

Why don't DC PSUs need a fuse?

This feels like a silly question, but after taking apart some of our 6W 12V DC power supplies I've noticed that none of them are fused. Out of curiosity more than anything else, I'm wondering why a ...
0
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1answer
54 views

Can you identify this fuse?

Sorry, dumb one really. I just had the heating out for a couple of days and eventually found a fuse blown in a controller for the (LK) underfloor heating. I can't tell what rating it has (amps). It ...
16
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4answers
4k views

Why did my fuse blow after 3+ years of no problems?

For several years, I have had a solenoid wired to the 24VDC output of a PLC (Rockewell Automation 1769-OB16). To protect the PLC output card, a fast-acting 500mA fuse was installed between the PLC ...
0
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2answers
292 views

Where to put the Fuse in a circuit

I have circuit where the input can be 12-48V AC or DC. This is fed to a bridge rectifier. I plan to put a fuse and got a bit confused, what is the best place to put a fuse? before the bridge ...
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1answer
901 views

Not sure how to replace a blown fuse in a building's fuse box

One of our fuses in our secondary fuse box just blew. Luckily, there there is a backup. I am not an electrical professional but I know a little 101. I just want to ask about the correct fuse / amps ...
0
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1answer
59 views

Glass fuse identification - Siran No. F 13 4A

We have a glass fuse for a 12v lighting circuit that has "Siran No. F 13 4A" written on paper inside it. The circuit takes 5.5A at the moment with all the lights switched on without the fuse blowing. ...
2
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2answers
286 views

Fuse: why does it connect in parrallel with resistor?

I have a wire in normal condition runs 4A. The device I am using is auto-transformer, and its data sheet recommend to use fuse of 10A. So I went to buy the 10A fuse, and mount it onto a fuse holder. ...
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1answer
230 views

Why can't I blow a fuse?

In the book I am reading, there is an experiment that consists of connecting an automotive style fuse and a 1.5V battery to observe blowing of a fuse. However my fuse does not blow. I have repeated ...
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5answers
55k 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 ...
0
votes
4answers
1k views

Why is this switched power inlet fused on both load and neutral sides?

I've purchased a Schurter 4304.6090 power inlet for a project and am a bit confused by the fuse configuration. The inlet requires two fuses: one on the load side and another on the neutral side of the ...
0
votes
1answer
51 views

Using AC fuse for DC & DC fuse for AC…!

Recently I visited a site where I saw that in an inverter AC fuse are use for DC..it is quit odd for me..!!! Is it ok to use the same? What are the factors to be considered when we use AC fuse in DC ...
0
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1answer
83 views

Electronic fuse

I teach electrochemistry to students in chemistry. During each class, there is at least one student that manages to burn the 200mA fuse of our $15 multimeters. It's quite annoying. I am thinking of ...
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3answers
260 views

Where/How should I fuse this transformer?

Background: I have a step-down transformer P241-5-36, which is a single mains primary coil to 36V Center Tapped (18-0-18) secondary. I would like to use this transformer to build a linear regulated ...
2
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2answers
67 views

spec of a fuse holder

While searching for fuse holders in the web, I found an infinity of pages like this, where the rating of the fuse holder is e.g.: "10A/250V AC, 15A/125V AC" (it is an example, values do not matter). ...
1
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1answer
51 views

How to verify fuse ampere rating

Is there any method to verify the fuse ampere rating without destructing it .I know the fuses works on the principle of resistive heating .If there is any method to verify the ampere rating without ...
1
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2answers
219 views

How can I make a Fuse Blown Indication LED circuit with variable voltage input?

I'm creating a power supply with an input fuse and and output fuse, and I'd like to have blown fuse indicators. However, the circuits I have found typically have set voltages and thus set resistors, ...
26
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4answers
2k views

Can thin sections of copper traces be used as fuses?

Is it safe to use thin sections of copper traces as one-shot fuses when cost is important, but when it is also vital to protect the rest of the circuitry? Should the solder mask be removed at that ...
1
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0answers
62 views

Is a Zener and a fuse enough protection?

We have a power chain that runs from an alternator, to a 24->12 dc regulator, to a battery charging circuit, to a 12 v battery. We were thinking of using this circuit minus the ac-dc converter part ...
0
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1answer
148 views

Directional audiophile fuses

There are some "audiophile fuses" in the market, and the manufacturers claim that they are directional. Here are some examples: HiFi-Tuning Isoclean Here is a quote from a fuse review (yep...): ...
3
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2answers
431 views

Current Determination - 12V to 5V (USB Output)

I am attempting to determine the current in an automotive installation of a 12V to 5V converter that will supply a USB output. Max output on the 5V side will be 3 Amps. ...
2
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5answers
753 views

How to blow a 0.6 ampere fuse

I am trying to do a simple project in which I am trying to show that when a high voltage battery is connected in a circuit then the fuse will blow and protect other appliances. In detail, I have four ...
0
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3answers
200 views

3.15A and 4A fuses - can I swap?

I have an old oscilloscope which doesn't work. I tried swapping the 3.15A/250VAC fuse with a 4A/250VAC fuse. The fuse immediately blew. My questions are: Did the fuse blow because it was the wrong ...
2
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1answer
71 views

Fuse resistor type

I want to build a flyback SMPS based on "TNY274". About the fuse before bridge, I don't know what kind of resistor should I use for correct operation! Metal oxide film or Metal film or Thick and thin ...
1
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2answers
263 views

need advice with LM317T current limiting circuit ,new alternative

i am using an LM317 as a Current Regulator for series LED similar to protecting LEDs From over current ( in time of short circuiting) for my LEDs and Mosfets, similar to this picture: the problem ...
0
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1answer
74 views
4
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4answers
1k views

How can I detect fuse failure?

I have two components in parallel on a DC circuit driven by a single momentary switch. Each component is individually fused. I need to detect failure of either fuse and in that event power on a ...
8
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4answers
3k views

Can a fuse be placed after a load?

Considering that the regular treatment of a fuse is to place it on the positive side, "before" a load, is this just common practice, or is it backed by an actual reason? Can a fuse be placed on the ...
7
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2answers
1k views

What are the dangers of a DIY fuse in a multimeter?

For the past few years I have been running my Fluke 79III without a fuse in its F44.100A 1kV fuse holder. This has meant that I've been unable to use the 40mA circuit. When I blew the old fuse, I ...
4
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2answers
709 views

Did I choose the correct fuse for my USB powered circuit?

I need to drive a circuit (operational current 150mA) with a USB port. I would like to protect the port with a fuse and from this question I concluded, that what I want is a PTC fuse. Is that the ...
0
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2answers
104 views

can I place 250ma fuse instead of 200ma fuse in multimeter, affacts meter calibration? [closed]

Well I know that it fuse will pass more 50ma in my multimeter but I want to know that will it make some change in my calibration of multimeter? can more 50ma current can damage my meter?