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4 votes
2 answers
169 views

Rated current vs melting integral of fuses

I am looking for a fuse for my project, and have become confused about how the current rating and melting integral (I2t) relates to each other. My understanding is that: The current rating indicates ...
mjuels's user avatar
  • 43
1 vote
0 answers
45 views

Cable current ratings

Which of these current ratings is used as the standard current ratings for cable: Cyclic, Sustained or Distribution. For example; A 630mm2 Cu cable (dry XLPE type) has a "Winter SUSTAINED Current ...
Chukwuma Collins Ezenyinwa's user avatar
2 votes
3 answers
171 views

How much more can I push current past the rating in a magnet wire?

If I have a chart like this that shows the current limit for different gauges of wound magnet wire, how much could I push the current over the limit for a short amount of time? I'm assuming these ...
Ombrezz's user avatar
  • 173
1 vote
0 answers
55 views

C7 plugs with 3A fuses

IEC 60320 C7 type plugs seem to be rated at 2.5A, yet they are commonly supplied and used in the UK on cables where the source side plug is fused at 3A. Does this meet standards, and is it legal and ...
river's user avatar
  • 170
0 votes
3 answers
84 views

Concerns about Exceeding Current Rating on SN74HC595N to drive LEDs

I am currently working on a project where I am utilizing SN74HC595N shift registers to drive multiple LEDs. According to the datasheet, the maximum output per pin is specified as 35 mA, with a maximum ...
HydroPage's user avatar
4 votes
1 answer
176 views

Molex PicoBlade current rating confusing

It seems there are confliction in specifications of PicoBlade for current rating. From the MolexPicoBlade Connector System datasheet, I assume that the current values in table is per circuit value. ...
slyx's user avatar
  • 221
14 votes
4 answers
3k views

According to my understanding, this induction heater should be melted, but it's not. Why not?

I opened up this induction heater to find that it only has maybe 12 AWG wire in its work coil, rated for 30 A RMS. I've been doing induction heater simulations for a project, and the two topologies I'...
Popeye's user avatar
  • 339
0 votes
0 answers
49 views

Electrical Project containing parts with different volts/amps rating

So I have a small project just for fun. Includes a Peltier module , and a small cooling fan like the ones used in a pc for airflow. So my question is since the peltier module have a different rating ...
AnnoyingGarlic's user avatar
3 votes
3 answers
412 views

Why are switchgears rated in specific capacities such as 63A, 100A, 125A and so on?

I am working in a consultant industry, wherein we get the switchgears from different OEMs. I wonder why the switchgears (including fuses and fuse-gears) and control gear assemblies are rated in the ...
DaSnipeKid's user avatar
0 votes
1 answer
32 views

How to check current rating of an adapter? [duplicate]

I have this old adapter, which I checked through multimeter shows 12 V. I need to power up the circuit with a power rating of 12 V and 2 A. Is there a way to check the current rating of this adapter?...
Just doin Gods work's user avatar
1 vote
2 answers
465 views

Voltage/current rating for center-tapped rectifier vs. full-bridge rectifier

I am currently working on an LLC resonant converter. While reading an application note from ST microelectronics, I found something about using different rectifiers for different purposes. I ...
ishankhowal's user avatar
-1 votes
1 answer
64 views

IGBT Modules current ratings - do they refer to the sum of 3 paralleled IGBTs or to each one of them?

soon I'm gonna build a motor controller and that's why I've started searching some IGBT Modules . The thing is - when I read some datasheets I see the current ratings but I don't understand what those ...
lidorov19's user avatar
-1 votes
2 answers
134 views

What rating of SMPS is perfect input to buck converter for 10A output

I'm having a 10A DC-DC Step Down Buck Converter, suppose I want to get X volts and Y amps at output, so do I need to have input DC of rating more than X and Y ? or how to decide input rating? Now let ...
Rishabh Sharma's user avatar
0 votes
1 answer
121 views

Finding the Voltage and Current rating of a switch [closed]

I just bought a couple of switches at a garage sale. One looks like a SPST switch and the other seems to be a DPST switch. No where on these switches does it show a Voltage / Current rating. How can I ...
Jordan Harris's user avatar
-1 votes
3 answers
57 views

Time factor in specifying rating of electrical components

Ratings of electrical components like switches and sockets are marked in Amperes. Which means above this current the component is likely to fail (melt, burn, etc.), if run over some "considerable&...
ontherocks's user avatar
0 votes
6 answers
761 views

Cables with different cross section having the same max allowed current?

I was looking to buy a power cable recently and my eye caught this weird fact. Look at these two cables: https://www.savio.net.pl/en/product/savio-1-8-m-schuko-m-power-cable-iec-c13-cl-138/ https://...
user2173353's user avatar
0 votes
1 answer
80 views

Power Supply Transformer Advice

So I'm trying to fix the power supply for my espresso machine. I've determined that the transformer is likely the problem (no continuity across the primary coil). The OEM transformer (encapsulated) (...
Alex Katz's user avatar
3 votes
2 answers
943 views

Create Transformer Center-tap From 2nd Secondary

After ordering this 200VA, 32V transformer, I realized that it doesn't have a center tap on each secondary, which I need to have. (duh on my part) So I want to use 110V across the 220V primary leads ...
Kent Weigel's user avatar
2 votes
3 answers
96 views

Where do AC/DC power adapter manufacturers get their high amperage (>12.3A) barrel plugs? [closed]

I was looking to swap out a barrel plug on a spare Dell 240 watt AC/DC power adapter to avoid having to purchase a ~$80 replacement with the correct plug. I went off to Digikey and Mouser in search ...
HanniballRun's user avatar
2 votes
1 answer
2k views

If a device is rated at 12 V/80 mA what does that mean as far as the length of time that it will draw 80 mA?

I have an electromagnetic device designed to hold a fire door open until either the circuit is cut or the building's electrical supply goes out. At which point the door is released and will close. It ...
BobNll's user avatar
  • 59
1 vote
1 answer
745 views

What factors do I need to consider when selecting an inductor to use in a circuit with the MT3608?

I am trying to use the MT3608 chip to boost the power output of a 3.7V lipo battery from 3.7V to 5V, which will ultimately power an ATMEGA32U4 chip. Below is a picture of my circuit where I have ...
rollingcodes's user avatar
3 votes
2 answers
786 views

Potentiometer overheating - is it due to current rating?

I need to get a pump running at different speeds so I ordered an electric motor, a potentiometer and a power supply adapter. I put them all together and they worked, however the potentiometer got ...
Roxana Radu's user avatar
1 vote
2 answers
1k views

Current Rating of a device (how does this change when changing the voltage)

Let's say you have a device that is rated at the following: 550 amps @ 12Vdc (heat) Max Voltage = 48Vdc (insulation material max voltage rating) I am mainly concerned with the heat, we could ...
Busta's user avatar
  • 35
0 votes
2 answers
200 views

What could be the output current rating of the following shunt regulator?

I am trying to solve the 2013 paper set by ISRO for electrical engineers. I wanted to verify if my answer to Question no 18 is correct. So \$I_L\$ is being drawn out of the circuit shown. Since the ...
Aditya P's user avatar
  • 337
0 votes
2 answers
2k views

Current rating for busbars

How does one go about calculating the current rating of self produced busbars? Store bought wires are a lot easier, as they have the derating factors for parallel wires and ambient temperature readily ...
user386094's user avatar
0 votes
1 answer
90 views

Does Switch current rating matters if its connected to ground wire

I am designing a pcb with an SMD switch. Usually my circuit needs 200mA peak current. But I am putting a 25mA rated switch on the ground line. Now according to my knowledge if I was placing this ...
AD Friend's user avatar
0 votes
2 answers
1k views

Less voltage more amp? switch characteristis [duplicate]

I have a question regarding switches, relays etc Ex, if I have a switch rated for 24v 0.5a, can the contacts then safely handle 12v up to 1a? Because the power passing the switch is the same? Or ...
Kristian Martinsen's user avatar
1 vote
2 answers
414 views

How to guess voltage ratings and current ratings in capacitor and inductor?

I have a list of values of capacitors and i also know their material types! But i don't know how to figure out their voltage rating? "Ratings have been removed in the capacitors for this purpose" ...
Hilton Khadka's user avatar
0 votes
1 answer
852 views

Does a VSR current rating affect the size of leisure batteries that it can charge?

(Apologies if this is a silly question, I don't do much electronics.) I'm converting a van into a camper. I've bought three 12V 95Ah AGM batteries (which, incidentally, will be hooked up to a solar ...
Bertie Wheen's user avatar
5 votes
1 answer
3k views

Why do the normally closed and normally open relay contacts have different current ratings?

Please refer to the image below: Taken from the datasheet: http://www.songchuan.com/db/pictures/AdminModules/PDT/PDT090410001/201191913495127935.pdf
lukecam95's user avatar
0 votes
1 answer
2k views

How to find step down transformer secondary output current rating?

I have obtained a small transformer with 7 windings, a 220V and 6 other individually isolated low voltages. How can I find out the current rating for the lower voltage windings? I was told these used ...
Indraneel's user avatar
  • 2,177
7 votes
4 answers
8k views

How to determine the nominal current of an LED?

I salvaged the LED disk from a defunct LED light bulb. (The problem was an arced transformer, the LEDs are intact.) It has several unmarked white SMD LEDs soldered on it: 5 lines parallel, with 3 LEDs ...
Neinstein's user avatar
  • 437
0 votes
0 answers
674 views

Can a 12V 7AH@ C20 battery support a motor having load variations form 1-10 Amps?

I want to know what is the significance of C5, C10, C20 rated 7AH Battery to drive a varying load 12V DC Motor. Is it possible for a C20 Battery to power the motor for atleast 20Mins or so if the ...
Jins Peter's user avatar
2 votes
1 answer
524 views

How to calculate the maximum current rating of an ammeter manganin shunt?

I want to make a shunt for an ammeter using a manganin wire. I don't know how to chose the wire diameter for the desired current. For example, my shunt will have 0.05 ohms and it must withstand 5A for ...
Marus Gradinaru's user avatar
4 votes
6 answers
6k views

Why do some wire gauge ampacity charts state vastly different current ratings?

This is a question that I've had for a while but have somehow managed to go without asking. Looking at all the wire gauge ampacity charts online, some of them appear to provide vastly different ...
Izzo's user avatar
  • 2,036