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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32 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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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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AGC/3AG 1.0 Amp High Breaking Capacity with inline fuse holder (Automotive usage: 24 Volt battery) [closed]

I am looking for this specific type of fuse. First question is this a fact acting fuse or a slow acting fuse? Second question is there a specific item number / SKU / Part number for this fuse? Can it ...
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1answer
38 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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43 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
50 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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63 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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22 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
57 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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28 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
41 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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47 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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36 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
36 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
45 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
325 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
64 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
48 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
53 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
57 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
109 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
17 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
39 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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2answers
83 views

Varistor - Place before or after the fuse? [duplicate]

What is safer? Before or after the fuse? In my case the varistor is 10mm, 275Vrms, and it is currently placed after a 250Vac, 7A, 20mm glass fuse. Would the varistor blow the fuse easily if placed ...
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1answer
67 views

How to open this switch/fuse box

This is a power switch from a vacuum cleaner, specified as 8A / 250~, which I suspect contains a fuse that has blown. The plastic case has four "tongues" on the sides, but I can't figure out how to ...
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4answers
133 views

What *fuses* an electric fuse?

I build a quite lot of projects to learn electrical engineering, and since I was first introduced to what's called a fuse around 2 years ago and I always put one in my high voltage 220V mains for ...
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1answer
59 views

Where to fuse high voltage batteries connected in series?

I have modules of cells in series each with 48V. I wonder where is the right place to fuse the modules in series. (The current to trip the fuse is the same on every point). Version 1: simulate ...
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1answer
33 views

Fuse design for taking in account real-world very small transients

A bit of context I came up with this question after someone suggested that two fuses are better than a main one in the below configuration. The converters are SMPSs which regulate output voltage. ...
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1answer
709 views

What is the difference between F5AL250V and F5L250V fuses?

In the glass fuses' code F is for fast blown the second number is the current, but I ignore what is the difference between L an AL (if there is any). Could someone explain this.
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1answer
57 views

Fuses in Series for High Voltage Where Maximum Current is Low

I'll start off by saying that I know this not a recommend practice. I'm looking to build a regulated power supply that can supply 1200VDC at 300mA. The supply consists of a transformer, xenon tube ...
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0answers
141 views

Why use an inductor as a fuse?

I opened a small "wall-wart" power supply that had failed, and discovered the culprit to be a low-value (100µH) standard (axial, green) inductor. This inductor had a visible crack along it, as if it ...
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1answer
54 views

800 A 12 V bank Winston LiPo4 fuse size?

Installing this bank, with about 1 meter to my inverter/charger, but I want to add a fuse on the positive side. The inverter is a Victron 3kW. The charger is 120 A. The cables that I have now are ...
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1answer
51 views

Troubleshooting Power Supply Fault

I was using my 12 V Power Supply, and suddenly a spark occured near the AC input terminals. The power supply stopped functioning. I opened up the casing and found some blackish colour near the 250V 3A ...
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1answer
94 views

Would the diode and the fuse protect the other components if power wiring is reversed?

Would the diode and the fuse protect the other components if power wiring is reversed? Is the polarity of the diode correct?
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1answer
69 views

Can I replace a 6.3A fuse with an 8A fuse [closed]

I'm shopping for a Universal Travel Adapter and I've found this one which seems to meet all my requirements. I've used a nice one for years and it recently blew out and it doesn't have a replaceable ...
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1answer
65 views

Popped a power supply fuse - What did I do wrong?

I recently purchased a 5V 40A power supply that looks similar to this: It didn't come with a power cable, so I found one that I wasn't using and stripped the side opposite the three-pronged side (the ...
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1answer
59 views

Zener diode in parallel with both the input terminals and the output terminals

"There is a zener diode in parallel with both the input terminals and the output terminals. Combined with the fuse these should help in reverse polarity situations (it should blow the fuse before ...
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1answer
76 views

Why did my Atmega328p chips stop working?

I am fairly new to embedded programming. I bought some Atmega328P U chips (not Atmega328P-PU). I have two Arduino boards and the chips worked just fine, and were letting me upload sketches. One of ...
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3answers
150 views

Can I replace a 12a fuse with a 15a fuse on a 12v - 120v automobile inverter?

I'm hard wiring an inverter into my automobile. Tapping into a 15a fuse in the fuse box. To hard wire it I had to remove the "cigarette plug" and in so doing removed a 12a fuse. I have an inline fuse ...
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0answers
72 views

PTC or One time Fuse or fusible resistor for li-ion protection.any suggestion?

I designing a kind of portable device ,it contains 450mAh Li_ion or Li_Poly Battery (depends on space on PCB). I design this system for mass production (10k-20K). I want to add overcurrent protection ...
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2answers
4k views

What type of glass fuse is this and what does the spring do?

This is a standard sized glass fuse like what cars used before the 80s. I can faintly make out 20A, but I’m not sure what to call it in order to find a replacement. The fuse in the picture has not ...
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1answer
51 views

Poly fusing external peripheral device

The design I am working on is having peripheral connector with +5V power in it providing the voltage to the would-be connected device. There's relatively a long way inside the design from the ATX ...
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1answer
56 views

Pin protection fuses

A colleague of mine created the following circuit with the 3x 5A fuses for protecting the power connector pins from oxidizing and melting the connector plastic (we had some cases, when the connector ...
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0answers
99 views

Using thermal fuses in parallel?

If one has some 216C 10A thermal fuses, could one wire two in parallel in order to fuse a 10A heated bed on a 3d printer? The bed is 110V and 1100W btw, so in normal operation it should draw 10A. ...
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47 views

Can I use a simple fuse to protect a CMOS over current?

I'm designing an output with a MOSFET transistor to control loads such as relays, motors or incandescent lamps, similar to the outputs of a PLC. Obviously, there is no problem as long as the load ...
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2answers
32 views

Should I look at nominal or max battery voltage for choosing resetable fuse?

I am building a LED/Camera control circuit that is going to be using a 14.8V Li-Ion battery as a supply. I want to put a resettable fuse to prevent short circuits from blowing up too much since this ...
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2answers
318 views

Using diodes for reverse polarity protection

I want to protect my circuit against reverse polarity, by simply adding two diodes in parallel between the + and - input cables. So if the polarity is reversed, the current will go through those ...
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0answers
20 views

Replacing thermal cutoff / fuse, what temperature to match to

I'm replacing a thermal fuse that has gone bad (already verified that the temperature of the device monitored was not going too high) and was wondering how / what to match the temperature printed on ...

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