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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 not within the scope of the Site and FAQ.

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38 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?
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3answers
48 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 ...
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1answer
81 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,...
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1answer
33 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 ...
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0answers
34 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?
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1answer
64 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 ...
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1answer
53 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 ...
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2answers
142 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 ...
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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 ...
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0answers
21 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 ...
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1answer
29 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 ...
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2answers
70 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 ...
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0answers
38 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 ...
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0answers
50 views

What is the type of this fuse?

this is 160mA SMD fuse, what is the type of this fuse?
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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 ...
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1answer
26 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 ...
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1answer
47 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 ...
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3answers
114 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 ...
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0answers
30 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 ...
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1answer
45 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 ...
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3answers
813 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-...
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0answers
36 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 ...
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2answers
57 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 ...
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0answers
14 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 ...
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2answers
149 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
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 ...
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1answer
29 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
104 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
69 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
71 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
67 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
30 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
64 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
35 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 ...
22
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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
62 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
257 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
50 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
44 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
92 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
124 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
36 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
44 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
94 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
436 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
243 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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1answer
185 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
58 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 ...