[SOLVED] Sensing 30A AC current using 5A sensor

[denujith]

I have an equipment which draws ~40 A (AC) when it is in operation and 3 A when it is idling. I want to know whether this equipment is working. I only have access to power lines. Can I use 5A Hall Effect-Based Linear Current Sensor for this (based on **broken link removed**)?

Can I split the current 5+35 so that I can use the 5A branch for measuring?

My requirement is a kind of switch so that I can know the equipment is working.

 

[mister_rf]

Yes you can do it this way, but in order to avoid any additional current dividers, why not to use a 40-50A sensor?
See for example:
**broken link removed**
https://www.phidgets.com/documentation/Phidgets/1118.pdf

 

[denujith]

Thanks

 

[mister_rf]

For a low budget you may consider to improvise the AC line current detection circuit, see details here:
**broken link removed**

Need to adapt circuit to 30-40 Amps so you may reduce the value for 100k resistor or the number of turns for the pick-up coil.

 

[Rey25]

You may also consider using Magnelab SCT-0750-005 current sensor. The transducer output at three Amps is 0.2 Volt, and 2.66 volt at 40 Amps.
**broken link removed**

Good luck