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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Diagnosing Vehicle Brake Lamp Fuse Blowing; What to test next? [migrated]

Fuse keeps blowing when I press the brake pedal on a 98 Windstar. Brake switch is good. Inserted new fuse and the brake lamps do not light up before the fuse blows. Removed all bulbs front and back ...
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1answer
56 views

need advice with LM317T current limiting circuit ,new alternative

i am using an LM317 as a Current Regulator for series LED similar to protecting LEDs From over current ( in time of short circuiting) for my LEDs and Mosfets, similar to this picture: the problem ...
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1answer
50 views

PCB/SCH Design: Fuse w/ Holder

How would one go about creating a library component for a through-hole fuse that sits in a holder? The part in question is this: Fuse: ...
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2answers
329 views

Determining voltage of fuse

My car battery is dead, and the fuse in my car battery charger is missing....(don't ask me why) I have a 20A fuse lying around and a 7.5A fuse that I took out of the car. The car battery charger ...
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1answer
33 views

Fuse position in relation to load and switch

Where should fuse be in relation to the power, switch and load? Any suggestions on a better approach or tips on the matter would also be helpful. POWER > [FUSE] > SWITCH > LOAD POWER > SWITCH ...
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1answer
43 views

AC resettable fuse

I am designing a circuit that plugs into a 12VAC source and I'd like to add a resettable fuse/PPTC for over-current protection. There's plenty of info on using such fuses for DC but I can't confirm if ...
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1answer
44 views

How long does it take (in seconds) to burn a fuse with high surge current?

Like the title says, how long does it take in seconds to burn a fuse? Of course it will depend on what type of fuse and the one I'm using is 61NM 250V/8A but looking at datasheets I could find on ...
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1answer
60 views

Is an older APC backup UPS likely to be the source of blown fuses in new lab equipment? [closed]

I have new laboratory equipment plugged into an older APC Back-UPS XS 1000. It derives all of its power from this backup system, which in turn is plugged into a regular power outlet. The lab equipment ...
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3answers
109 views

Phone travel charger for powering circuits dangers

I am thinking of using a phone travel charger to power a circuit.Ratings: input:110-240VAC(my outlet has 220volts) 50/60Hz 0,3A output:DC 5,2volts at 400mA The problem is that 220 V are of course ...
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1answer
47 views

How does a fuse affect creepage reqirements?

I am designing a mains-powered device that has to comply with IEC 60079-15 (Non-incedive industrial eqipment). Creepage distances in this standard are inherited from IEC 60664, pollution degree 3. For ...
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2answers
61 views

Trying to Fix my remote for my house Fan, is this component a fuse?

Decided I would try and fix the remote for this 3 speed fan I have a home since it is summer now. Here's the circuitry I'm dealing with here: So here our are some notes: There was some battery ...
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2answers
270 views

Filtering Capacitors before the fuse or after the fuse while limiting inrush current?

There are basically two questions I have for this circuit. 1) Which capacitor configuration is good? before fuse or after fuse 2) How do I limit my inrush current? My thoughts: I am confused ...
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1answer
65 views

Automotive power supply - considerations for selecting fuse

A power supply circuit for a device that runs off the 12V battery of a car, is shown below. simulate this circuit – Schematic created using CircuitLab LM7805 is used to generate a 5V ...
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44 views

Recommendation for Overvoltage Protection

I am now trying to design an adapter between an inverter and a simulator. I actually need to do some protection for the very expensive simulator on the design. I did my job for digital signals with ...
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1answer
86 views

What are the technical specifications of Tesla “cell level fuses” one fuse per cell

How do Telsa cell level fuses work? Can they protect against short circuits and internal cell fusing? How is the current distributed throughout so many fuses? A total of 200 amps could pass through ...
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2answers
141 views

How to fuse batteries connected in series?

Is it possible to wire each battery in a series to the next using a fuse wire, so that the individual batterie's max power output is not exceeded? here is an illustration, suppose each battery had a ...
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1answer
78 views

Overvoltage protection for RS485 inputs

I am using an Analog Devices ADM483E RS485-chip to build a device with RS485-capability. Datasheet here: http://www.analog.com/media/en/technical-documentation/data-sheets/ADM483E.pdf . The finished ...
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1answer
61 views

Alternatives for automotive fuses?

So be I recently asked a question about using a PCB design for a fusebox (link here: PCB design for automotive fusebox?) but since recently come across two other fuse alternatives: PPTCs and ...
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2answers
88 views

PCB design for automotive fusebox?

I am currently in the process of designing an automotive (motorsport related) fuse-box as a side project to my studies. I've not had much luck searching for fuse holders (20 position) however while ...
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1answer
64 views

Fuse rating and safety

Under what conditions would a faster, higher rupture capacity, higher voltage-rated fuse be less safe than the equivalently current-rated fuse which was slower, lower rupture capacity or lower ...
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2answers
82 views

Best approach to design or implement short circuit protection?

I'd like to implement a safety mechanism in my circuit to avoid overvoltages/overcurrents in the event of a short, but am unsure as to what what the most robust or appropriate design approach would ...
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0answers
50 views

Be on the safe side with 12 v battery as powersupply

I have a 12 v battery connected to a LI-PO charger that uses 1.5A. Now i want to make sure i'm not going to fry anything so i want to connect a fuse. Question 1. How do i calculate the value of the ...
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1answer
87 views

Fuse: testing on PCB

I have a slow-blow 3A, 1.2A2s (I2t), 32V SMT fuse [1206 package] in my design. The power is supplied by the 12V battery in a car. Questions: How can I verify that the fuse would protect my circuit - ...
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1answer
44 views

Current problems with DC motor interacting with a H-Bridge IC

How do DC motors work in stall I have been told (from my engineering project seminars at uni) that if your motor has a stall current of 5.6A, you should use a 5.8A fuse to cut it off after it begins ...
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1answer
55 views

Delay vs Quick Fuses for servos

I have read that delay fuses are ideal for electric elements that require an additional start-up current like electric motors. I am using several servos to drive a pretty heavy mechanical structure. ...
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2answers
59 views

Replacing normal fuse with self resetting fuse

I have a multimeter with a normal fuse that I have recently broken and I would like to replace it using a self resetting fuse with the same specifications (250mA / 250V) by soldering it in place. ...
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44 views

fuse metal alloy with high springiness?

Is there a fuse alloy that would have the same springiness as this except with a little wire that comes out and that plugs into something, so that it could be machined and pressed from one single ...
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1answer
265 views

What is this Externally-Triggered Fuse?

In the datasheet for an overvoltage protector (TI BQ771815) there is a device I don't recognize: It is used in the datasheet as a fuse which can be opened by an external signal from the overvoltage ...
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1answer
35 views

Which type of fuse should I use with a coil heater?

Fast blow or time delay (anti surge) type? I have read motors require anti surge fuses to permit higher than rated current for short periods during start up.
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2answers
222 views

Replacing glass fuse with reset button fuse?

Several months ago i made a 10Amper power supply with 5 outputs, each output has a fuse holder for crystal 10A Fuses, they work as intended but its a chore to replace them every time i short them, i ...
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3answers
143 views

Why don't DC PSUs need a fuse?

This feels like a silly question, but after taking apart some of our 6W 12V DC power supplies I've noticed that none of them are fused. Out of curiosity more than anything else, I'm wondering why a ...
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2answers
172 views

Fuse: why does it connect in parrallel with resistor?

I have a wire in normal condition runs 4A. The device I am using is auto-transformer, and its data sheet recommend to use fuse of 10A. So I went to buy the 10A fuse, and mount it onto a fuse holder. ...
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1answer
259 views

Appropriate fuse for 12V battery - solar power controller connection

I'm a biologist tracking migratory bats and need to build a bunch of antenna towers to listen for pulses from tagged bats flying nearby. These are off-grid, so we'll have 55W solar panels charging ...
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1answer
105 views

How to detect if a high voltage fuse is blown

I have a 150A fuse on a 100A @ 400V nominal battery pack. There are 5 service relays and 2 isolation relays (one on each pole) in this battery pack. I'd like to make sure that none of these relays can ...
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1answer
69 views

Fuse and AWG choice for immersion heater circuit

I am planning to operate a 1500 W resistance immersion heater with an SSR and I'm trying to determine which fuse and AWG wire to use. The 1500 W heater on 115 VAC should operate at a current of around ...
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121 views

Resettable fuses in parallel to limit output current

What are your experiences with this? it is reliable do use PTC smd to limit 15A? the datasheet has a hold value and a trip value. How I choose the values?
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1answer
66 views

Multimeter reports voltage but no power?

I have an Insteon FilterLinc, which is an electrical line filter. It doesn't work. When I connect a lamp to the "filtered" outlet, I get no power. So I stuck multimeter probes into the filtered outlet ...
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3answers
126 views

Do fuses affect a PC PSU's amperage output?

I have a PC PSU powering a load that should pull 20 Amps. I put a 10 Amp fuse in series with the load and the PSU. However, the fuse simply will not burn, and the PSU continues to supply the load, ...
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1answer
357 views

What are the correct zener diode and PTC fuse size?

Noob here. I need to add overvoltage protection to a small, portable solar power system I'm putting together. The solar PV array has a loaded voltage in the 23-26v range and an open circuit voltage ...
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16 views

SKM15C-05 which fuse for input and output?

I'm very new to this, but I've ordered an SKM15C-05 documented here: http://www.meanwell.com/search/SKM15/SKM15-SPEC.PDF My plan is to use it to power a small SOC unit via power over Ethernet (POE). ...
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1answer
325 views

Fuse blown indicator circuits compilation

I have been working in a compilation of circuits to use that basically show to the user that a fuse has blown up, this is particulary useful in the bench, needless to say I haven’t tested all of them ...
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2answers
76 views

Fuse for AWG 8 wiring

Assuming I put a 60amp fuse to an AWG 8 wire, whats the worst case scenario when a short circuit happens? Therory about short circuits says the current goes to "infinity" however, shouldnt the fuse ...
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6answers
2k views

How To Know If a Fuse Will Work Properly?

I want to know what kind of periodic test we use to test if a current-limiting fuse will normaly open and protect an electronic circuit (a battery charger) if a failure occur (short circuit or over ...
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185 views

Time-graded overcurrent protection setting

Source: "Protection of industrial power systems" by T Davies. I am the typical calculation for fuses section, page 92, from chapter 5. There is a calculation were the max overload current of the ...
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2answers
171 views

Transistor fuse problem

I can't find out how this transistor fuse works. I know that the R1 is there because of voltage drop 0,7 V when the voltage on output is at its highest possible value. But I don't understand why there ...
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2answers
259 views

DC Motor drawing too many Amps

I have a treadmill incline motor that is blowing its circuits fuse every time it starts to run. This is the motor that lifts the treadmill up and down. The motor is labeled: Output: 65W Input 36VDC ...
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2answers
417 views

Did I choose the correct fuse for my USB powered circuit?

I need to drive a circuit (operational current 150mA) with a USB port. I would like to protect the port with a fuse and from this question I concluded, that what I want is a PTC fuse. Is that the ...
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1answer
1k views

avrdude: initialization failed, rc=-1

when trying to program the fuses I get this known error message: $ sudo avrdude -c usbtiny -p m328p -U hfuse:w:0x05:m avrdude: initialization failed, rc=-1 ...
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3answers
619 views

What is the function of fuse here

The datasheet states that TPS2400 protects the load from an over-voltage, by disconnecting the load from the power supply (Q1 goes off), without blowing the fuse. Why is the fuse F2 here, if there ...
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3answers
191 views

Short Circuit Indicator circuit

This circuit was designed to save electronic components in the assembled board from damage. It gives warning beep if there is a short circuit in the assembled board. Thus it helps to switch off the ...