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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 ...

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8answers
5k views

How to solder a 70 °C (158 °F) thermal / temperature fuse

For my DMX project (schematics is not important), I soldered this temperature fuse which has just two leads (see picture below). The fuse doesn't work (meaning it does not conduct electricity) ... ...
0
votes
1answer
42 views

In a DC circuit, are there any reasons for wiring overcurrent protection such as fuse or pptc PHYSICALLY near the load?

In a DC circuit, are there any reasons for wiring overcurrent protection such as fuse, pptc, etc.... PHYSICALLY near the load(or inside it)? By wiring "physically near", I mean in the power wire going ...
3
votes
1answer
92 views

Adjustable High current source (40A?)

I a looking for a schematic of a circuit to built an adjustable current source capable of delivering up to 40A. I am building a battery with 18650 cells. These cells will be individually fused ...
1
vote
1answer
41 views

Is this fuse on a mains switch adequate?

Given this diagram for a section of a mains circuit (seems like there's no varistor symbol) - simulate this circuit – Schematic created using CircuitLab I gather that it's important for this ...
0
votes
1answer
32 views

De-rating / Re-rating criteria/theory for frequency in circuit breakers

I'm trying to spec a circuit breaker for a system that will be performing in the 3kHz range, and am not finding much info on how to calculate a new rating based on frequencies in this range (where ...
0
votes
0answers
16 views

Proper fuse for vacuum motor? [migrated]

dears: I have a device which has on vacuum motor inside it with this characteristics: 220V/2200 Watt We have one GLASS CARTRIDGE FUSE for it which is 250V/10A F ...
0
votes
0answers
48 views

Residential wiring mapping [migrated]

I wanted help to verify the results of me mapping our house wiring in order to replace it with circuit breakers Here's the fuse box: The main lines also go through, will try to get in the attic to ...
0
votes
2answers
73 views

Sizing AC fuse for a DC device

I have an enclosure which consists of a power entry module and a 24V DC power supply. So inside the enclosure, the 24V DC power supply is powered by the 230V AC through the power entry module. And ...
0
votes
3answers
78 views

thermal fuse as electrical fuse

I am trying to understand the spec of a Datasheet of a thermal fuse. for example the one below : https://nl.farnell.com/panasonic-electronic-components/eyp2bn134/fuse-thermal-cut-off-2a/dp/1832031 ...
1
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1answer
47 views

FLUKE 15b+ fuse test

I have accidentally shorted my circuit (5 Volt Vcc) for approximately 1-2 seconds max. While the circuit was short circuit I use the FLUKE as ampermeter in miliAmper mode (400mA max fused) The current ...
0
votes
0answers
33 views

Fuses on both lines of an isolated AC/DC converter

I'm redesigning a board made from another person. This board have several AC/DC converters (like Traco TMP07 Series and similar) and some screw connectors to connect external devices. Neither the ...
0
votes
2answers
42 views

How Could I Implement a Fusable Safety Switch

I am looking to design a low-level safety override. This override can be represented as a three terminal device that is electrically a switch. simulate this circuit – Schematic created using ...
1
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2answers
84 views

Precision resettable fuses

I am a scientist, and I have found myself needing to interface two disparate pieces of equipment. I have a precise, automatically controlled current source that I wish to interface to a very ...
1
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2answers
113 views

Do I need to fuse batteries in parallel?

I have two deep cycle batteries in my Airstream, in the panel there is a fused bus bar (that appears to be faulty) so the solar panels only charge the one battery. Can I just run a heavy gauge wire ...
0
votes
1answer
63 views

Replacing fuse in Dewalt battery charger

This is a photo of a Dewalt DW9104 battery charger (ie for a cordless drill). It appeared to be dead but I think I've narrowed the problem down to the fuse labelled ...
3
votes
0answers
85 views

Slow-blow fuse equivalent for overvoltage?

Working on an compact electronic ballast design (~5 W load), I see the need for an over-voltage protection circuit that has a 'slow-blow' characteristic. When a lamp is turned on, a striking voltage ...
0
votes
1answer
44 views

IEC connector with both Line and Neutral Fused

I require an IEC connector mains entry with both the Line and Neutral fused. The double fuse is required in order to be compatible with reverse polarity of the mains connector on the other side of the ...
0
votes
1answer
51 views

How to fuse batteries connected in parallel?

I have two GEL batteries 12V/130Ah and want to connect them together in parallel. Currently I have one battery in the system and it is fused on the positive wire before the isolation switch. I ...
2
votes
1answer
99 views

What is up with this fuse?

Found this fuse at work. Normally these fuses have a single wire inside but this one has a little black "resistor"-looking thing on a spring. What is up? First picture is of a "normal" fuse. The ...
0
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0answers
20 views

AC fuse sizing and type for a power entry module

I have this power entry module with a 6A rated current. The module needs two fuses to be installed. The exact model is: FN 286B 6-06 and at the bottom of page 2 the rated current is given as 6A at 40°...
1
vote
1answer
56 views

What does it mean to trip in PTC Fuses?

Hi I want a current flowing 1A. I don't understand what does it mean to trip? (Image source - Farnell PTC datasheet) Does it mean to open the circuit? Should I be looking at a holding current that ...
0
votes
0answers
33 views

KUKA LBR iiwa Robot_Reducing the carried amperage by merging wires

Based on KUKA IIWA specification I can connect an 8A power supply to X651 (input) which is connected to two outputs (X36 and X32). Each output can provide (Max) 4A. My problem is that I need to power ...
0
votes
1answer
30 views

How do I re-wire my Airstream Fusebox so as to follow best practices?

I was not sure if this was better suited for Automotive Stack Exchange, but here goes. I'm tying to redo the fuse panel in my Airstream and I have some questions about the best way to wire it. The ...
1
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4answers
438 views

Fuses - Are there any voltage conversion for the break-off

Anyone knows the very common glass fuses in electronics etc. But I am uncertaion about the breaking conditions. Example: A fuse rated as 5A/250V, it is the breaking point. But I have seen such used ...
1
vote
3answers
79 views

Is it necessary to add fuse protection (at the inputs) when using multiple DC-DC converters?

I would like to know if it is necessary (or recommended) to add fuses at the inputs when using multiple DC-DC converters. I have attached a quick schematic to illustrate what the design would look ...
0
votes
2answers
73 views

PPTC Resettable Fuse

I recently bought a few types of resettable fuses, but now I'm a little bit confused using them. I have bought: 30-UF200 (Hold: 2A, Trip: 4A) RUEF300 (Hold: 3A, Trip: 6A) R30400 (Hold: 4A, Trip: ...
1
vote
2answers
52 views

Can an array of fuses protect a PC port from damage?

I'm paranoid right now because I made another circuit meant for the parallel port of the PC. While all my previous experiments involving the port were successful (except for one experiment I made a ...
0
votes
1answer
522 views

What is the difference between “Slow Blow” and “Time Delay” fuse?

I'm wondering if there is any difference between "Slow Blow" and "Time Delay" fuse or those are just different terms. There are many answares for Slow Blow vs Fast Acting Fuse but are offtopic for ...
1
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2answers
63 views

Using a lower voltage for a replacement fuse

I need to replace a blown fuse in my Tacklife DM02A multimeter. It says on the back of the multimeter that the blown fuse is F1 250mA 600VAC. Its size is 5mm x 20mm and it has to fit into a clip ...
0
votes
0answers
23 views

Symmetrical power supply: Rail fuses useful or dangerous?

I'm designing/testing power amp stuff with symmetrical power supplies (43V-0-43V). In the next future I'm planning to control all safety/healthy stuff (like over current / over voltage / temperature ...
0
votes
1answer
160 views

12V 12A resettable crowbar circuit

The idea is to protect the input stage of a control card from improper power supply connection. The power supply is a standard desktop AC-DC power adapter (Meanwell GST160A12) with inbuilt shortcut, ...
2
votes
1answer
53 views

understanding circuit protection

Ok so i'm hoping that someone can explain to me in basic terms: in an un-fused circuit what could actually cause an electrical component to be damaged by current flow. I'll explain the reason for my ...
1
vote
2answers
107 views

How to detect if fuse has blown?

I want to detect with a microcontroller if a fuse has blown. The circuit with the fuse is 12V when on (it is not always on, so I need to distinguish between a blown fuse and the circuit not running). ...
0
votes
1answer
29 views

Parallel 'Gang' Wiring Several Solar Panels

I need to connect 3 similar 180W solar panels to my MPPT. Each one outputs max 9A. I would like to send a + wire and a - wire for each panel back to either a bus bar or a fuse box... and then use a ...
0
votes
1answer
86 views

Automotive fuses directly on PCB

I'm trying to save board space used up by regular cartridge fuses. An horizontal fuse holder for those occupies about 27×10mm in my board (vertical mount is not an option). An obvious solution seems ...
0
votes
2answers
153 views

Earthing Bracelet safety

I have a family friend which likes to sleep with a direct connection to earth. This question is purely to do with safety, nothing to do with what you or I or anyone for that matter believes about this ...
0
votes
2answers
28 views

Fuse Protection inline with DC Brush Motor

I have run into a number of instances where my 12A DC brush motor (linear actuator) is being overloaded. I have tried fusing it with a 10A Blade Fuse as well as a 15A Blade Fuse. In both instances, ...
0
votes
0answers
33 views

DC disconnector/breaker and battery fuses for 24V 100Ah solar system

I have an off-grid solar system up and running well so far. However, as far as understand there is one essential part is missing in the setup which is the DC disconnector between the inverter and the ...
0
votes
1answer
49 views

Is this the correct fuse to use on the primary side of a transformer?

I am trying to design a linear power supply to learn how AC is stepped down and converted into DC. However, I am having trouble figuring out how to choose a fuse value for use on the primary side of ...
1
vote
1answer
135 views

Thermal Fuse Crimp material

I speculate this is just barely an EE question, but I'll risk it anyway: I'm replacing a set of 175C 10A thermal fuses (with 172C 10A actually). At this temperature / current range, do we need ...
18
votes
2answers
4k views

Why do fuses have a maximum breaking capacity?

Wikipedia told me that breaking capacity is the maximum current that can safely be interrupted by the fuse. I don’t understand why, if a small current can blow the fuse, a bigger current can’t. If the ...
1
vote
0answers
48 views

What fuse to use for a AC/DC buck converter

I want to make this 8 channel DMX Splitter. Instead of the transformers I will use 9 AC/DC Buck Converters, 5V/3.5W. According to the explanation 1.5W is enough so that should be ok. The description ...
3
votes
3answers
269 views

Why Does DC Load Draw Twice As Much AC Current Through Transformer?

I have designed the following circuit, comprised of 4 loads, 1 of 4.2ohms and 3 of 21ohms, drawing a total of 2.4Arms (1.5A, 300mA, 300mA and 300mA respectively) of AC current through the secondary of ...
3
votes
4answers
370 views

Specifications to consider when selecting a polyfuse

I am designing a power supply for a flight controller, and I am finished with the regulating and almost everything else. I want to have a polyfuse on both of my inputs, but I don't know how to pick ...
3
votes
2answers
185 views

Why fuse blows in this circuit?

simulate this circuit – Schematic created using CircuitLab Hi, I am trying to build a 5VDC from my 220VAC (Switched-mode power supply). The first step is to convert AC-DC. Above is my ...
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3answers
110 views

choosing the right fuse for a PCB

I am experimenting with making a PCB and have created some short circuits when wiring everything up which have fried one of the traces. i was wondering whether it would be a good idea to put a fuse in ...
1
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4answers
178 views

Is a fuse necessary after a power supply?

I am working on a project with some 12V LED strips and am planning on powering them with a Mean Well LRS-150-12 power supply (12.5A @ 12V). My total LED strip load is about 10A. I was planning on ...
0
votes
2answers
83 views

Remotely monitor condition of fuse

I am installing five 12V batteries in a motorhome. The batteries will be wired in parallel for a 12V system and will be contained across three different enclosures. Each positive cable link between ...
4
votes
5answers
1k views

Small step down transformer fuse, primary or secondary?

For a small 24V 1A transformer where should I place the fuse? Secondary 1A fuse or primary 100mA fuse (or above accounting for inrush current)? Mains is 230V. Also, the smallest fuse available in the ...
0
votes
1answer
80 views

Maximum fuse rating before a MOV (varistor)

I just watched some scary videos of MOV's catching fire and I've flee'd here to ask you guys for help. I understand that it's a good idea to put a fuse in front of a MOV, considering it fails short-...