Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

0
votes
2answers
51 views

Is it possible that a load can be destroyed if I am disconnecting all other loads in the circuit but one?

I consider myself as a beginner, so please don't be that hard to me. Can I theoreticaly destroy a unfused load if I disconnect all loads but one in the same circuit? In my understanding the current ...
0
votes
1answer
71 views

Why were the fuses not protecting the circuit?

I bought a Aprilia SR 50 Scooter with a "small" problem, the frontlight and the horn are not working, because the 10A fuse does blow up if the key is turned... I don't know what happened today, but I ...
0
votes
2answers
43 views

Need to replace a surface mount fuse. T10 L AC250V. Please help [closed]

Basically I have a device which seems to have blown a fuse. I've done some research and found that it's a "surface mount fuse" or smd fuse. My main questions are where can I find this fuse(or is any ...
0
votes
2answers
53 views

Choosing the right power cord for my PC adapter [closed]

I need to replace the euro power cord on my new PC with a UK one. The power adapter for the PC has the following rating: Input: AC100-240V - 50-60Hz, 3.5A Output: 19.5V (direct current) 11.8A The ...
1
vote
1answer
35 views

Question on fuses specifications

In the datasheet for fuses (for example, I'm looking at the Bel Fuse 0678L9150-02 -- datasheet at https://www.belfuse.com/resources/CircuitProtection/datasheets/0678L%20Jun%202016.pdf), they report ...
0
votes
0answers
40 views

150 A 12 - 16 V DC Short Circuit Protection

I am powering a ROV from a 4S LiPo battery (12.0 V minimum, 16.8 V maximum). The resistance of the battery is 36 mΩ, so that a maximum current of 470 A can flow through a short-circuit. In order to ...
0
votes
1answer
55 views

How do I use the I2T rating of a fuse?

I've read on a Littelfuse page that I2T of a fuse is a measure of the let-through energy. The units of amps^2*resistance is power. Multiply that by time and you have energy. But in a I^2*T rating of a ...
0
votes
1answer
75 views

Purpose of backup fuse in SPD

I am trying to understand the main purpose of backup fuse used in SPD (Surge Protection device). Is this used to protect the SPD from high AC current but still allowing surge current to pass or does ...
1
vote
0answers
39 views

Is the transistor reverse polarised?

I found the schematic of e-fuse on some site and cant understand the functionality of BC212. According to me this transistor is reversed. Can someone explain?
0
votes
3answers
52 views

How is the fuse amp rating determined for a 12V AGM battery bank?

I would like to put 3 x 130Ah AGM batteries in parallel and attach a fuse to the positive terminal of each battery. What size fuse should I use? How is the amp rating of the fuse determined? The ...
0
votes
1answer
87 views

At which amperage will 2 x 100A fuses mounted onto a dual fuse holder blow?

My question is related to a 300A rated dual fuse holder of the following type which is to attach to the positive terminal of an AGM battery: If 2 x 100A fuses were to be mounted onto this fuse holder,...
0
votes
1answer
40 views

Transformer fuse for primary coil. 240V with 16VA

So I know it may be a basic question but hear me out. These are the specs for the transformer I would like to buy. To add a fuse to the primary coil I would do 16VA/240V which gives 0.06A. Does that ...
0
votes
0answers
43 views

How to calculate fuse size for primary coil?

How do you calculate fuse size for primary coil? I have an 230V AC to 18V DC. What are the steps please?
1
vote
1answer
71 views

Selecting true crystal settings for 328P [7.3728 MHz]

I want to make a new board working with 115200 (gsm modem) UART. so I want minimum baud error rate. I look at https://cache.amobbs.com/bbs_upload782111/files_22/ourdev_508497.html table and decide ...
0
votes
1answer
61 views

My Anet A8 power supply blew up

A few days ago, I received my Anet A8 Power supply (240W, 20A) power supply in the mail. After the second time plugging it in, it blew the fuse and the rectifier. I found a blob of solder connected ...
2
votes
2answers
146 views

Power Supply Design Help- failure at higher currents

I am trying to design a 60V 6A supply to power a power amplifier. Here is the circuit I have so far. Feel free to open it in Circuit Lab and play around: simulate this circuit – Schematic ...
0
votes
1answer
38 views

How do I choose appropriate fuse for my circuit?

I am currently using a AC-DC adaptor with specs: AC-I: 100-2040V~50/60Hz 1.6A DC-O: 12V 5A Which is powering up 8 DC motors, 4× 12V 6W 4× 12V (wattage not specified, the motor is meant to be ...
1
vote
0answers
49 views

Choosing an Automotive Fuse with ISO 7637-2 (Pulse #1 24v system) in mind … -600v Transient

In designing a input power protection circuit in an automotive application with a 24V power bus, how does one deal with the -600V transient described in ISO 7637-2 Pulse #1: In particular, I'm ...
0
votes
1answer
30 views

Fusing on dual voltage industrial device

Please forgive me if this question has been asked before. I am designing a heating device that will be sold to industrial consumers. In our past designs we have had multiple versions of the same ...
0
votes
2answers
71 views

Is my radio pulling more current than it should? [closed]

I have an FT-747GX radio that I am using as a RF generator for a plasma cleaning machine. In the operating manual on page 3 it states: I have a power supply connected to this radio which outputs ...
0
votes
0answers
46 views

AVR ATmega328 low fuse wrtiten and issue

I am using an Arduino Uno as the hardware programmer together with avrdude as the software programmer for flashing an Atmega328. I have noticed PB0 was set to ...
0
votes
0answers
52 views

What is the type of this fuse?

this is 160mA SMD fuse, what is the type of this fuse?
0
votes
0answers
39 views

Electrical safety measures in LED bulbs for the European market

Which electric safety measures are required to introduce LED bulbs on the European market? Which electric measures prevent that the plastic LED bulbs will melt down or ignite at the end of life? I ...
0
votes
1answer
32 views

Fuse needed to prevent too much current draw in DC motors?

I am building a basic Raspberry Pi robot: the Pi controls the enable pins on a dual-bridge motor controller bridge via PWM and sets the input pins for direction. I have a variety of battery options ...
1
vote
1answer
60 views

Help identifying fuse 3.6 x 10mm 125 V, 2.5A cylindrical maybe ceramic?

I would like some help identifying the type (and maybe brand or model number) of fuse this is and if anyone has suggestions on what might be suitable for a replacement or what terms I can search for ...
1
vote
3answers
190 views

E-fuse using Mosfet

I have not succeeded to make an e-fuse according to this schematic. Basically its a simple current limiter to 14A , where the mosfet G to S structure breaks the current flow. Can someone check, whats ...
1
vote
0answers
34 views

Double Fusing - PTC and Normal

I'm working on a power distribution board for a couple of low voltage PCBs (mainly seperate microcontrollers on individual PCBs). The idea of the power distribution board is to regulate the input ...
0
votes
1answer
50 views

What fuse to select for a 240W power supply

I have a 12Volt 20Amp 240Watt regulated power supply to use for a table top pinball game - comprising of solenoids (2@ 12V 8A peak), some LEDs and a micro controller. The unit has an internal fuse but ...
6
votes
3answers
844 views

Fuse 125V/4A can be replaced with 250V/4A?

I want to replace a blowed fuse 125V/4A but it is rare to find them. Can I use instead a 250V/4A ? I read at https://www.mojotone.com/support/Knowledge-Base/Is-it-ok-to-replace-125v-glass-fuses-with-...
0
votes
0answers
38 views

DC Variable power supply

I would like some advice on a particular circuit design for a variable DC power supply. Here is some information about what I want to do: I want to do open and short circuit tests on an alternator ...
0
votes
2answers
135 views

Amperage rating of thermal fuse

Consider this SW-104T thermal fuse. It has a current rating of 10A. Does this mean that in addition to its thermal fuse capabilities (blowing at a certain temperature profile), it also behaves as a ...
0
votes
0answers
15 views

Substitutability of thermal fuse

I have had this SW-104T thermal fuse blow on me. I'm not in a situation where I can obtain an the exact replacement, so I am wondering about the substitutability of thermal fuses. If I match the ...
1
vote
2answers
226 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 ...
0
votes
0answers
36 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 ...
0
votes
2answers
56 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 ...
0
votes
1answer
140 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 ...
0
votes
1answer
98 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 ...
1
vote
1answer
80 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 ...
0
votes
2answers
78 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.
0
votes
1answer
42 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 ...
5
votes
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!
2
votes
2answers
66 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. ...
0
votes
1answer
44 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 ...
23
votes
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) ... ...
0
votes
1answer
77 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 ...
4
votes
1answer
273 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
54 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
54 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
2answers
108 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
154 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 ...