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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1answer
41 views

Selecting a fuse

I'm trying to select fuses for a 3 phase generator. It's a specialty generator and the manufacturer rates it at 360Vrms and 50Arms under full load. I'm fusing the 3 individual phases before they feed ...
1
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0answers
35 views

What is a good melting point for a lithium battery contact fuse?

Tesla uses a fuse on every battery for their cars, and many fusible alloys melt from 50 to 90 degrees. because the fuse is welded onto the battery it wouldn't matter what the fuse current was, you ...
1
vote
4answers
142 views

What is the schematic symbol for resettable fuses?

I have seen symbols for one shot fuses and circuit breakers, but not for resettable fuses which reset themselves when the fault goes away. What is the recommended schematic symbol to use?
0
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1answer
45 views

Does a lamp need a fuse?

I have a floor lamp in which I have installed 2 LIFX Color 1000 A19 Wi-Fi LED Smart Bulbs (http://www.lifx.com/products/color-1000) The lamp is designed to have 2 bulbs and has a two position dimmer ...
1
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3answers
59 views

The use of fuses in small electronics projects

I am new to electronics so I hope this question is acceptable. I have been playing around with an Arduino. I have use the USB output from a computer as a power source. I also have a 9V battery. I am a ...
0
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1answer
36 views

What holder for a 3,6x10mm fuse? [closed]

How would one mount a fuse that is 3,6mm in diameter and 10mm in length on a PCB? I can't seem to find a method to do this, browsing through the electronic components suppliers. Datasheet: http://...
2
votes
2answers
88 views

How “slow” is a Class T “slow blow” fuse?

I have a DC inverter that's rated for 3kw sustained with a 6kw peak (for up to 5 seconds). Per the Inverter manual, the manufacturer recommends a battery fuse rated for "at least 350 amps". How can ...
1
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3answers
52 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?
0
votes
1answer
55 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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3answers
44 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 ...
3
votes
1answer
137 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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1answer
32 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 ...
1
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1answer
73 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
votes
1answer
77 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) ...
0
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2answers
53 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 ...
4
votes
1answer
84 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 ...
0
votes
1answer
54 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 ...
0
votes
1answer
55 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 ...
0
votes
3answers
67 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 ...
1
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4answers
144 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
vote
2answers
136 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 1)...
6
votes
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
votes
1answer
71 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 ...
-3
votes
1answer
75 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 ...
-1
votes
5answers
150 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 ...
0
votes
1answer
62 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 ...
0
votes
2answers
320 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 ...
16
votes
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
votes
1answer
70 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. ...
5
votes
1answer
271 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 ...
0
votes
1answer
73 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
votes
1answer
86 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 ...
1
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3answers
553 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
votes
2answers
69 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
vote
1answer
53 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
vote
2answers
342 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
votes
4answers
3k 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
vote
0answers
66 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
votes
1answer
188 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
votes
2answers
477 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
votes
1answer
93 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 ...
0
votes
1answer
76 views

Can I use a fuse rated 400V 32A on a 220V 32A circuit? [closed]

Can I use a fuse rated 400V 32A on a 220V 32A circuit?
0
votes
3answers
289 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 ...
0
votes
2answers
118 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?
4
votes
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 ...
0
votes
1answer
48 views

Can a fast blow fuse with higher current rating affect motor's performance? [closed]

I have an old blender that I wanted to use after a couple of years. When I turned it on, it was functional for about half a minute and then stopped working. When I took it apart, I found that the ...
2
votes
2answers
130 views

What's the real inrush current in my AC/DC rectifier?

I'm working with rectifiers and power supplies at the moment and I'm trying to reconcile simulations with real world observations about my circuit. It's a full-bridge diode rectifier (4x 1N5821's) ...
3
votes
2answers
561 views

Are regular fuses temperature sensitive?

Are common fuses, like AT car fuses, temperature sensitive? Say a 12v 5A fast blow fuse, would it have any significant change in its reaction at 0ºF than it would at 100ºF? In either time to blow or ...
1
vote
2answers
337 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 ...
1
vote
1answer
176 views

PCB/SCH Design: Fuse w/ Holder

How would one go about creating a library component for a through-hole fuse that sits in a holder? The part in question is this: Fuse: http://www.digikey.com/product-detail/en/37202000411/WK4234BK-ND/...