What happens when you overload an inductive current monitor?

Thread Starter

zirconx

Joined Mar 10, 2010
48
I'm looking at some clamp on current monitors such as this: https://www.robotshop.com/en/seeedstudio-non-invasive-ac-current-sensor-30a-max.html

It's rated for 30A max. What happens if you clamp it on a wire carrying more than 30A? Can it damage the circuitry inside the clamp? Or is it just a max of 30A of range - i.e. no matter how much more current you pass, the output maxes out at 1v.

Same question about these 5A boards made to interface to arduino: https://www.ebay.com/itm/Analog-Current-Meter-Module-AC-0-5A-Ammeter-Sensor-Board-for-Arduino-NEW/264257181462

Thanks
 

crutschow

Joined Mar 14, 2008
23,528
In general, I would expect the output to start to saturate above its rated current, with the output voltage soft limiting.
It's not likely to cause any damage.
 

MisterBill2

Joined Jan 23, 2018
4,055
My experience with putting an inductive current pickup on a wire with more than the rated current is that the readings are not accurate. The magnetic part saturates and so the output voltage does not increase in a linear manner. The magnetic field continues to increase but that is the flux through the air, so the reading is way low. But no physical damage. That is not the case with series ammeter shunts, however. They are subject to overheating and solder melting and such nasty problems.
 
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