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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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79 views

Can a thermal fuse of a higher rated current be used safely?

I want to replace a 115°C 250V 2A thermal fuse used in a fan motor. The only fuses available locally are 115°C 277V 15A. Can I use the higher current rated thermal fuse? Since it is a thermal fuse, I ...
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0answers
34 views

Resetable fuse leakage

I'm planning to use Resetable fuse PTC for cable protection of a sensor's cable. The sensor will not draw more than 40mA. So considering that PTC is not accurate and its affected by temperature I ...
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1answer
23 views

Blow MSP430 security fuse with FET430 or MSP-FETFlash programmer

Is it possible to use a FET430, MSP-FETFlash or similar programmer to program and then blow the security fuse of the MSP430 devices? We have 500 which already been soldered on the boards and were ...
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1answer
59 views

Auto Fuse Tap Parallel or Series

Am looking to use a fuse tap to run a dash cam. These are instructions https://www.lumision.com/wp-content/uploads/2015/09/Micro2-Fuse-Tap-Instructions-e1441486778366.jpg for a fuse tap and consistent ...
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1answer
41 views

Crowbar Circuit for 35V OVP - What parts should I use?

Please excuse my confusion, because I really don't understand what the "150mA max continuous cathode current" means on the datasheet for the LM431. I'm also not sure it'll work in the crowbar circuit ...
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1answer
66 views

Blown oddball fuse

I have a device that has a blown Daito BD20 DC400V 2A fuse. Datasheet here: https://www.furutaka-netsel.co.jp/pdf/daito/bd.pdf . These are rather odd looking, solder-in fuses and they are apparently ...
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2answers
51 views

Replacing radial fuse with ceramic/glass fuse

Is it possible to replace a radial fuse T5A 250V with a Glass or Ceramic Fuse 5A 250V? It's for a power supply for a LED TV.
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1answer
24 views

How to add the TVS protection?

I'm still busy with my DMX splitter (soldered everything), however, I made a mistake with my TVS protection diode. I put it in series with 220 V AC, and nothing happens (no current flows). I expect I ...
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1answer
1k views

Logic behind this fuse status indicator

I was doing this circuit which I found on the Internet. My question is what is the logic behind the functioning of this circuit? Thanks!
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2answers
54 views

Will a 300A HV connector fail before a 600A fuse does?

I know this is a silly question but I cannot find ant data indicated it will not. The HV connector rated at 300A @ 85C and it is a 600A fuse, I cannot find a connector with a higher current rating. ...
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1answer
33 views

How to protect against a short circuit fail in 12VDC X capacitor?

When adding an X capacitor for simple line filtering in a 12V DC electronics project, how would you add protection against an unlikely short circuit failure in that capacitor? Is it as simple as a ...
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8answers
6k 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) ... ...
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1answer
48 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 ...
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1answer
229 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 ...
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1answer
44 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 ...
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1answer
34 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 ...
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2answers
80 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 ...
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3answers
103 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 ...
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1answer
50 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 ...
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0answers
34 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 ...
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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 ...
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2answers
86 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 ...
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2answers
202 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 ...
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1answer
108 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 ...
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0answers
107 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 ...
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1answer
47 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 ...
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1answer
70 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 ...
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1answer
103 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 ...
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0answers
22 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°...
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1answer
58 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 ...
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0answers
38 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 ...
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1answer
31 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 ...
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4answers
442 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 ...
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3answers
89 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 ...
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2answers
91 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: ...
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2answers
55 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 ...
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1answer
799 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 ...
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2answers
72 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 ...
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0answers
24 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 ...
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1answer
206 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, ...
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1answer
56 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 ...
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2answers
128 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). ...
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1answer
31 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 ...
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1answer
107 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 ...
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2answers
159 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 ...
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2answers
32 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, ...
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0answers
44 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 ...
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1answer
107 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 ...
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1answer
184 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 ...
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2answers
5k 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 ...