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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3answers
72 views

Simple and compact Over-Voltage protection with fuse and resistor

I know there are many techniques to protect over-voltage on the power supply. However, it does not apply to my case as it only provides single polarity voltage protection. Additionally, I want to ...
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1answer
49 views

Do eFuses work with AC current?

I was wondering if integrated eFuse solutions exist that are designed to protect a low voltage AC bus. In my application I would like to replace a 2A PTC that protects a 24VAC bus but I cannot find an ...
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1answer
62 views

What models and brands can I find for logic fuses?

I'm trying to find logic fuses like the ones found here. As I'm new user, I couldn't comment there, so I created this new question. That fuse, in my case, is on a Clevo P170EM battery. This battery ...
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1answer
51 views

How does a fuse resistance vary with temperature change?

In datasheets usually a cold resistance is given, which represents fuse resistance at low load, according to Littelfuse guide https://m.littelfuse.com/~/media/electronics/product_catalogs/...
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1answer
91 views

How can I prevent my multi-meter fuse from blowing with a brief 120VAC surge?

I wanted to test how much power a GFCI outlet uses while idle, so I hooked up my multi-meter to test the current flow. I put my test lead in the amp socket, and confirmed the current was on the order ...
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1answer
89 views

Guitar amplifier repair: burnt fuse, capacitor, what else?

A friend has asked me to take a look at his guitar amp: Peavey Valve King VK212. Problem: suddenly the amp stopped working during operation and the status lamp went off. First reaction: fuse ...
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10answers
8k views

What causes a fuse to blow, the current or the power?

Fuses and circuit breakers are often specified at a certain current they will 'blow'. Increasing the current will also increase the power. So if a fuse is rated for 12V DC and 20 A, this would be ...
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1answer
53 views

When to use different types of fuses

Fuses come in all sorts of shapes and sizes, assuming that i have a specification for its current and how fast i need it, what are the other considerations for choosing a fuse type? Fuse types that i ...
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2answers
70 views

Is it safe to replace a ceramic fuse with a radial one? [closed]

I have to repair a led tv with a blown fuse. On the power board the fuse required is a T4.0AH/250V fuse, but I couldn't find it at the shop. They gave me instead a radial fuse, claiming that it's the ...
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3answers
91 views

Why does fuse rating not coincide with max power of device?

I am reviewing the electrical specs for a few different devices, and I am just confused why some devices have a fuse rating that allows for a higher power input than what is listed as the "max ...
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1answer
70 views

Unexpected increase of resistor's resistance after overload

I was trying to make a so-called bridgewire (an electric fuse to initiate fireworks remotely). I took a low-power 1206 SMD resistor (1.8 Ohm, 0.25W) and applied high current to it (a pack of three ...
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3answers
54 views

How to Put a Fuse on the DT-9205M Multimeter?

I got a DT-9205M multimeter, it has 20A unfused and 0.2A fused after I saw the PCB, surprisingly there is no fuse on the 0.2A and instead of that they put 000 resistors on it I wonder if I could put a ...
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1answer
30 views

What is the voltage and amperage rating for “Q” labeled SMD fuse?

I am looking for the specification for the "Q" rated SMD fuse. Since this was found on a 12V rail on a 150W graphics card I can deduce a 12A fuse should work but I wanted to be sure that is ...
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0answers
30 views

Appropriate fuses for inverters?

I have a 2000w inverter in the camper-van I just bought and I am getting my hear around the whole electrical set-up in general. There is a 30A fuse in-line between the 12v leisure battery which the ...
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1answer
56 views

Is using a wire rated the same as its circuit's fuse OK?

I want to add a kill switch on the fuel pump relay in my car, which includes extending a line connected to a 15A fuse. I bought some 15A auto wire, but on reflection I'm not 100% sure if that's right. ...
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1answer
89 views

How unsafe is it to use a 10 amp fuse with a trace designed for 4 amps?

Obviously I am a hobbyist and yes I am messing with mains. I do understand the danger which is why I'm asking this question. I originally wanted to make a PCB that can handle 10 amps but I couldn't ...
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1answer
29 views

What is the best way of connecting electricity fuse/cut-out

I am talking about home/industrial electrical fuse fitting or correct mointing . Should the fuse be mounted on L(live) wire or N(neutral) wire?.
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4answers
2k views

Fuse keeps blowing on AC/DC Adapter

Recently I have noticed high freq. screeching noise coming out from my laptop's adaptor. I opened it up and found that it came from somewhere around a diode named egp10a. I checked it (unplugged) with ...
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2answers
116 views

combine two identical fuses in parallel

I'm thinking: If I have two fuses of same type and rating in parallel, the current would split approx 50/50. If one fuse have a lower resistance, then more current will flow in that, it will get ...
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1answer
85 views

Trying to identify SMD component from a Ps2 Slimline

(English isn't my first language) I'm trying to fix an old Playstation 2 Slim my cousin had that was turning off by itself after 5 minutes playing. After some search on the internet, I found that it ...
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0answers
43 views

What is the RMS current going through this fuse?

I'm chose a fuse to for a transformer, and now I'm trying to calculate the cross section of the cables. I'm using the following formula: Where Tk is the protection time, Ik the short-circuit current ...
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1answer
53 views

Are fuse wires in air tightly sealed heat shrink tubes safe?

i've seen a few Videos now, where people use fuse wire as single cell protection layer for parallel battery packs to protect against catastrophic failure due short circuit of a defective cell. Often ...
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3answers
94 views

Fuses & current ratings - are there fuses that blow “fast” close to their nominal rating?

The context or reason for this question is the following: Reminder: the question is about the fuse, not about the TRIAC. The context may help to understand the question. A 230V output is controlled ...
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1answer
36 views

Fusing an In-Wall LED Application

I'm building my own PCB to power 8 in-wall LED's for a stairwell. I'd like to protect the LED's with fuses, but I'm unclear on how the voltage on fuses work. My specs are as follows: LEDs: 5V, ...
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1answer
53 views

What is the purpose of these coils in contactor auxiliary contacts?

Can someone please tell me what the function of this module, and more specifically, the curley wires on top of this contactor? It looks like the wires go to the same terminals as the main contactor ...
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0answers
25 views

Replacing AGC 1.0 Amp High Breaking Capacity fuse (rated 1500A)

What other alternatives do I have in order to replace the fuse (above subject line)? Will a Slow blow or fast blow fuse will perform the same goal? What type of fuse do you recommend for a perfect ...
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1answer
45 views

Resettable fuse nominal

I've found a part which looks like this: I found out that this is a fuse, but i can't find any information about nominal. I suppose that marking show allowed current, but what about multiplier?
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2answers
37 views

Why do x amp rated consumer electronics often come with >> x A rated BS1363 fused plugs?

I often find that consumer electronics from reputable brands come with fused plugs that are rated significantly higher than the actual product. I would have thought that the ideal fuse would be \$x+\...
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1answer
43 views

Troubleshooting Switch Mode Power Supply

I am trying to troubleshoot switch mode power supply from HP workstation. I have done visual inspection and didnt find any anomalies on the capacitors. I reckon that the culprit might be the fuse as ...
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0answers
48 views

Determining which fuse to use and where to put it

I've been working in my thesis project which consist on a PID controler to mantain a certain temperature in a case. The heater module is made of two 40W-12V 3D printer resistors and one 15W-10 Ohm ...
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1answer
112 views

Fuse on Primary Side of Transformer keeps blowing

I have a HVAC which is having a 24V 40VAC transformer. I might have shorted the output of the transformer while working on the wires. I noticed that the fuses on the input side of transformer blew ...
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1answer
109 views

Hair dryer fuse too low for spec power?

So I'm tearing down this hair dryer for a school project where I need to make it have variable heat and variable motor speed which can be controlled through an Arduino. I'm currently looking at where ...
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0answers
25 views

Troubleshooting adding a bluetooth receiver to my intercom system

I have a Nutone IMA 4406 intercom system with several intercoms throughout the house. I am interested in wiring a Bluetooth receiver to its Auxillary line in connection so that I can stream music ...
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1answer
59 views

Advice needed for replacing a microwave fuse

The fuse from my microwave blew out last week. I removed the fuse and measured it with a multimeter to confirm the problem (It was measuring as infinite resistance) The fuse cap reads the following: ...
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1answer
44 views

Jump starting a motorcycle behind a fuse? (slow blow atc fuse?)

I have a motorcycle with an SAE 12v 10ga lead for charging that I'd also like to occasionally jump-start the motorcycle with, I need about 90amps for about 1 second, which is fine for the 10ga wire, ...
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1answer
70 views

Safely powering Dell laptop from external Li-ion battery with a 11.1V/19.5V step-up converter

I need to build a power-bank type device for my Dell Latitude 6530 laptop (19.5V, 90W nominal power input). I have 12 Li-ion 3.7V, 3.35Ah (18650-type) cells, 3S4P configuration (11.1V total output). ...
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2answers
53 views

Transformer fuses for Primary and Secondary

Good afternoon, I hope that you are all well not withstanding COVID-19. I have a 230/24v 250VA Transformer which is being used to power 4 x motors drawing a maximum of 20.3 Watts each. I would like ...
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1answer
40 views

Primary and secondary fuse size for a transformer

I have a 220V AC to 24V AC transformer rated at 2Amps. What size of Primary and Secondary fuse should I use?
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1answer
38 views

I am after a better specification of fuse than is on the board of a daikin split air conditioner

I picked up a couple of scrap daikin split Ftxs60bvmb The fuse on the control board is dead but it only says 3.15a 250v Is this a ceramic slow blow/ anti surge or a fast blow fuse?
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2answers
76 views

could this be a fuse?

I was so stupid to leave a Ring rsc 516 smart charger in the rain. Hopefully, only the fuse is blown. However, I am not sure where the fuse is? could it be the black thing on the photo? I did a ...
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1answer
107 views

Fuse detection in a lithium Battery Parallel connection

I really need your help in order to figure out a solution to detect a blow fuse in a 16S parallel connection. The issue is: Despite a fuse has been blow the voltage at the other side of the fuse is ...
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3answers
548 views

Why does AC input have a parallel resistor and capacitor?

Well, I am trying figure out a situation with images and a circuit diagram. I am checking all part looks normal, but if I insert this board on a machine the resistor is exploding and one leg of ...
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2answers
76 views

Why the redundant Fuse and redundant rectifier diode(Series)

I would appreciate if someone would share his thoughts on why would someone put a fusible resistor in series before an NTC ? . Also in the rectifier diode stage there are two extra series diodes in ...
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0answers
51 views

Basic Question: Why does this Short cause Blown Fuse?

I recently re-did some wiring connections for the horns in my car and accidentally shorted the wires out at the green wire in the picture below. This causes the 20 Amp fuse to blow, but I do not ...
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1answer
59 views

Fault protection circuit

I've searched the electronics stackexchange site but couldn't find an answer for the following 2 questions: For a home project I'm designing a circuit that is powered by a 24V battery. This battery ...
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1answer
58 views

What is the danger of going beyond the current limits of a wire carrying AC current

If I am using 18 AWG wires with a current limit of 16 A, what are the potential hazards of going beyond 120V,AC and 16A,AC(rms)?
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5answers
147 views

Why should a fuse be installed in live instead of neutral?

I understand why it should be installed in positive instead of negative side in DC, but this is AC. Direction of current reverses half of the time. It is said that installing a fuse in neutral causes ...
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0answers
25 views

Low resistance fuse selection for BMS voltage tap

I want to put inline fuses on the voltage taps of a battery bank I'm assembling. The BMS (Orion Jr) documentation requires a fuse with current rating of no more than 3A for the voltage taps, and ...
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1answer
54 views

120 VAC switch safety feature?

I am making a switch to control a desk light using this pilot relay. My module is plugged into a half-hot wall outlet that's controlled by a wall switch. The module uses a momentary-on switch to ...
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0answers
46 views

Thermal cutoff for a high current mains application

I'm designing an inrush current limiter for a large rack which will under normal conditions draw ~25 A at 230 VAC. I'd like to be able to trip the current carrying live wire if the temperature in my ...

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