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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2answers
57 views

How can I provide time-controlled current protection?

I need a component name or solution. I have a fan motor that I run with AC. I am controlling with MCU and driver. Operation logic: 0.75 s on, 9.25 s off. My circuit works flawlessly with this logic. ...
6
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4answers
1k views

Limiting 1000 µF capacitor inrush current to protect fuse and power source

I have a WS2812b (NeoPixel) strip controlled by ATmega and powered by 5 V 2 A cell-phone style charger (from Digi-Key). The strip itself is located about 1.3 m away from the power source and ...
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0answers
49 views

RTX2080 Super - Fuse blown on PCIE 12v

I bought a 2080Super (Palit Super X). It was a cheapy on eBay and after a little bit of poking around, I found a blown fuse on the PCIE power 12v. The card was absolutely dead, core didn't heat up etc ...
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1answer
41 views

Can an auto reset fuse and capacitor save my tracking device from surges while keeping it running?

I work with a few tracking devices and the newest model keeps popping. I've narrowed it down to possible short term current spikes in the trucks they are installed on. The device receives power from ...
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4answers
91 views

Why does a fuse break before an LED?

Assuming the current passing is more than what both the fuse and the LED can handle, if electrons pass through the bulb first, would the fuse break first, or is it a matter of the LED requiring more ...
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3answers
139 views

Why multimeter 10A fuse blew when measuring voltage? [closed]

Trying to figure out what happened to not make the same mistake. I was measuring if electricity is on or off on wires and with usual V port (600 mA) it showed weirdly huge number - above 1000, where ...
14
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2answers
5k views

Suicidal ASUS power brick?

I was playing around disassembling an Asus laptop power brick (19V, 4.74A) and came across this strange arrangement in the circuit, where just after the bridge rectifier, there is a MOSFET (Q1, N ...
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1answer
58 views

Parallel batteries - blown fuse detection

We have parallel 48V batteries connected with fuses as shown below: How can we detect a fuse being blown by a MCU connected with same common ground with a separate power supply? Edit 1: Note that ...
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2answers
71 views

Can a fuse (non-resettable) wear out over time?

If a given circuit (containing a fuse) operates perfectly and continuously, will there come a time when the fuse simply stops working due to age and wear (wear from passively passing current ...
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3answers
984 views

How do I protect the power supply from a short circuit inside a device?

I'm working on an electronics project which would be powered by a 12V power adapter. I'm worried that in a case of a short circuit inside the device I'm making, the adapter could catch fire. Every ...
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1answer
72 views

Taking Apart A Fuse Safely

I’m planning to make a Van De Graaf generator, and it requires using only the glass part from a fuse. Is it safe to remove the glass part from a fuse by heating it with soldering iron or match? I ...
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35 views

50VA Transformer HRC Fuse Selection maths

How do I select HRC fuses for the primary mains input of a 50VA Toroidal Transformer? Trying to design an EMC filter for the primary side of the transformer and planning to implement two HRC fuses for ...
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1answer
44 views

Am I reading this time till trip vs. current diagram correctly

Am I reading this diagram correctly? Top x-axis translates to "rated current for fuse". Bottom x-axis translates to "constant current through fuse in A". y-axis translates to "...
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47 views

What kind of fuse is this? [duplicate]

I'm taking a look at TI's reference design for a 10s-16s battery pack cell measurement device, the TIDA-010208, and I am unfamiliar with one of the components they use. Specifically, in the schematic (...
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38 views

Let-through current of MCB

I'm wondering what's the reason of creating the let-through current diagrams for fuses and not for MCB's. Even more curious I'm, because one of largest manufacturers is providing the let-trough ...
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2answers
315 views

Component name - breaking circuit based on ambient temperature

I'm trying to add a (resettable?) fuse to a circuit (24 VAC) which breaks a circuit when ambient temperature reaches a given temperature (say 60° C) in addition to current crossing a threshold. All I ...
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2answers
64 views

How to size the fuse in this case?

Inside an enclosure, this PSU(12V, 12.5A) powers all the electrical devices such as DC fans and some other DC operated devices. So basically the PSU powers everything and needs to source 8A ...
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2answers
70 views

Will a 250V fuse work fine in a 1000V multimeter?

I busted my multimeter due to improper use (see Why would a multimeter give an unexpected current reading?) and so decided to change the fuse. Annoyingly I can’t seem to find a 15A 1000V 6.3mm x 32mm ...
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1answer
120 views

I2t vs time curve interpretation [closed]

How can help the i2t vs t curve in fuse selection?
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3answers
143 views

Intentionally tripping a fuse to disable a circuit in an unrecoverable fault condition?

I'm building a device that regulates the atmospheric composition of a space using a gas sensor and a control loop to actuate a solenoid valve to release compressed gas into the space. Due to the ...
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0answers
41 views

LiFePO4 Battery, fuse, and resistor needs when using a 12V DC to 120V AC inverter?

I am new to micro power grids and learning how to use DC-power storage with AC-powered devices. In researching the topic I have read some unsubstantiated points I want to clarify. Battery: Apparently ...
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0answers
104 views

Replacement for 2w 1.1 ohm fuse/fusible resistor of Samsung Mobile charger

I have a Samsung Mobile Charger (type-c) with the model name EP-TA800 and it has stopped working. I opened the case and found a fuse (fusible resistor) labeled 2w1.1ohm that had failed so when I ...
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2answers
51 views

Thermal fuse circuit question [closed]

DIY oven repair question. My oven has two thermal fuses, one is definately blown, I'm not sure about the other. Are these typically normally closed cicuit (open when hot) or could they be the other ...
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1answer
101 views

Blade Fuse Properties?

I am sure you have seen automotive 'Blade' fuses. They are special fuses constructed to protect equipment that is DC powered. I have asked around and determined that a 125v DC rated fuse is more than ...
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2answers
52 views

Polarity of fuse? Amptrap A30QS500-4

Could someone explain reason behind diode pictogram (symbol) on an Amptrap A30QS500-4 fuse? Why would a fuse have polarity, does it? How can I find the polarity of it? I tried to check it with ...
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2answers
76 views

Can an RCD do the job of an ordinary fuse?

Suppose we have a short circuit somewhere in a house. Does a residual-current device (RCD) stop the current in this situation exactly as an ordinary fuse does? or it's not reliable for this?
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1answer
84 views

Fuses in fan flow

Fuses as in classical wire types blow when the wire melts or fuses .This gives rise to a current rating , and some overload capability due to the heat capacity of the wire.There is some ambient temp ...
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2answers
68 views

How to prevent an electrical motor surge from repeatedly blowing the fuse when it stalls?

So, this is something that I shouldn't need to do, but I do. As far as I understand, it should be trivial, bit I'm hazy on the details. I have a 2kW mains AC power tool with a rotary output. Its ...
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3answers
126 views

Are these fuses out of spec?

I recently bought a very cheap assortment of glass fuses rated for 250V (AC, presumably). Just to be on the safe side I decided to test that the fuses actually trip at the currents I want them to trip ...
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1answer
45 views

What fuses do I need?

I was trying to post a photo but it doesn't seem to like it I am repairing an electric fireplace, the fuse seems to be blown. It is a classic glass fuse with a long strand down the center. It says 25A ...
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0answers
31 views

NI sbrio FPGA board does not power up - any leads to debug NI FPGA board?

I accidentally shorted the DC power supply pins on the sbRIO 9612 FPGA board and my DC power supply had a very large current limit. Now, the FPGA board does not power up. To see if the fuse blew up, I ...
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1answer
100 views

Should I put fuse before safety capacitor or after, when designing an unregulated power supply?

I am designing an unregulated power supply to power a few linear voltage regulators, as shown in the image. The power supply will use a 230vac to 9vac 2 coil step down transformer. Since the power ...
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2answers
58 views

MOV failed due to lighting or OV on power line Feeder control

we have a filed failure of our product which is feeder controller as shown in below image. It installed in metal box. we have tested our feeder stand alone at 15KV surge and it compliance with 15KV. ...
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1answer
54 views

Fast circuit breaker on low side of mosfet driven led circuit

I have some high power CREE COB LED's CXA1304-0000-000C00A20E8, which I turn on for 0.5 ms using a MOSFET on the low side. The signal comes from an optocoupler. I experienced some burned MOSFETs from ...
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2answers
99 views

What size of the fuses does fluke multimeters use?

So I burnt my fuses today using my AstroAi multimeter. I went to several hardware stores in Seattle and they only have fuses with 5mm x 20mm and 1/4 x 1-1/4 inch. I bought the 1/4 x 1-1/4 ones and ...
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2answers
54 views

Simple OTP/Fuse circuit

I need to implement a one time programmable (OTP) logic function. The task is to inhibit/blow a single 3.3V logic signal for safety reasons after production of the device. I found some small fuses ...
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1answer
52 views

Motor power rating and in-rush current

I'm looking to replace the cable of a mains (UK 230V nominal +10/-6) appliance, essentially just a motor, rated at 180W. The existing cable has a 3A fused plug; my options to replace it (restricted ...
4
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3answers
2k views

Can I put a 250 mA fuse in replacement of a 160 mA fuse?

I have a guitar amp that works on 110 V and someone accidentally plugged it in a 220 V socket. I want to replace the fuse (160 mA) but my local store's lowest is a 250 mA. Can I actually use this? ...
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3answers
73 views

Separate ground and track fuse

This buck converter uses 2 separate grounds. AGND and PGND. Why do we require 2 separate grounds? I have seen in another schematic which mentions something like track fuse which ties the board ground ...
41
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3answers
11k views

Why is the number 63 popular in electronics?

Capacitors have a voltage of 63V (not 60 or 65). Fuses have a value of 63A (not 60 or 65). And there exist more odd values in electronics... Who knows the history of this convention?
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2answers
63 views

Fuse Average time Current

I would like to know why I can not match Littlefuse chart with general rule of picking fuse which is 125% of peak current of the system. (I know there is more about fuse such as voltage, temp, AWG.) ...
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1answer
61 views

Circuit protection with different voltage inputs via switch

This may be a beginner question but I am kinda lost here. My Vin is either 24VDC or 12VDC - controlled by a rocker switch. If 24V is selected it gets regulated by a buck to 12V ~7A max. If 12V is ...
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1answer
42 views

Polyfuse for AC line no 10A? [closed]

I have a circuit where I would like to replace standard 10A glass fuses with some resettable solution. I have looked into polyfuses: https://lcsc.com/products/PTC-Resettable-Fuses_11042.html?q=poly%...
3
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2answers
181 views

How to size an in-line fuse for the input of the DC-DC power supply

I have purchased a Meanwell switching power supply with the following specifications: Input: DC 36-72V (6.7A) Output: DC 24V (8.4A) I want to put an inline fuse on the positive cable going to the ...
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1answer
59 views

250v rated glass fuse on 12V [duplicate]

I have assembled an audio amplifier, starting from a cheap tpa3116d2 circuit board. It is powered up by using another cheap step-up circuit to reach 14V (manufacturer suggested 24V). I wanted to ...
0
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1answer
75 views

How accurate is a DC fuse's voltage rating?

I understand that a DC fuse's voltage rating is determined by the possibility of a connection-sustaining plasma arc. However, unlike the current rating, which is based on the very well understood ...
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2answers
46 views

Do current limits apply just the same on lower voltage?

Do current limits also apply on lower voltage? For example: I have a wire/fuse that is rated for 2A. I usually runs it at 10VDC. Then, I use 5VDC with 3A load. Will the fuse blow?
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1answer
68 views

-30V/+30V protection

I'm looking for a symmetric +30/0 -30/0 V protection (overvoltage (+-35 V), undervoltage (+-10 V), overcurrent (4.5 mA) and reverse polarity) for an opamp. I would like a circuit that reactivates ...
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0answers
28 views

Change simulator fuses in Atmel Studio

I have been test the example. AVR1316: Using the XMEGA Self-programming driver on ATxmega128D4 device through the Atmel Studio simulator. The program executed fine but does not modify the content of ...
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1answer
80 views

What can be the reason for a three phase fused socket to always blow the same fuse?

I am supplying a 30 kW load through a 3 phase socket. The socket is fused and the same fuse (same phase) is always blowing after a few hours of usage. What are the possible reasons for a single line ...

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