Coosing a Current Shunt.

Thread Starter


Joined Apr 2, 2009
The supplies I had in mind can Supply 10 to 12 Amps .

I like to chose a current shunt. I chose this.

Will it be suitable or do I need to go for high rating like 20A.

I never used these before.
I like to know the what the data actually says.

I am thinking that if it says 75mV 15A, it will drop a total of 75mV when 15A of current flows through it.

OR is it 75mV per 1 Amps ?
Last edited:


Joined Jul 22, 2009
The downside with buying components from eBay is that they usually don't provide a good datasheet or complete specifications.

But for all the current shunt resistors I have used in the past, the current rating have been for continuous operation. So a 15A shunt should be enough.

I'm pretty sure it is 75mV/15A (5mΩ). Also based on previous experience.


Joined Dec 13, 2013
the 75 mv indicates that it is to be used with a 75mv meter, and voltage drop acorss the shunt is 75mv at 15A. if you use a shunt with .001 Ohm,you would read 15 mv at 15 amps. most of these surplus shunts were not designed with digital meters in mind.


Joined Apr 24, 2011
I've bought a few of these off EBay, different values but similar when I needed a .0025 ohm reference resistance.

My $3000 Keithley micro ohmmeter says it is spot on. Had to snag it away when a load bank needed a sense resistor and 20A thru the 30A rated device goes on all day.

They have an excellent Kelvin terminal arrangement. I used similar decades ago that were 10 times the price.