Recommended source of solid core CTs

[Jon (Jon Murphy)]

@overeasy

I have had great success with the HWCT-004.

I found your post from earlier this year. Thank your for the test info and images!

I found very little info about the HWCT-004 on the internet.
• What physical size are the CTs?
• Are any additional components needed to use these (e.g., diode, resistor)?

HWCT-004 Decent little CT

While waiting for new PCB I took some time to modify my CT calibration rig so I can hook up non-clamp type CTs. I had picked up a bag of HWCT-004’s on eBay awhile ago for about $2 each and didn’t expect much. I was pleasantly surprised. [image] They saturate at about 50A so good for most branch circuits. The linearity is easily less than 1% similar to the SCT-013, but the real difference is the low phase shift. As low as less than 0.5 at the low end and less than 0.2deg above ten amps. …