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Vintage Engr · 15th Dec 2020, 5:30 pm

I used a small current transformer, & a couple of transistors & a relay. This was to turn on my workshop vacuum cleaner when the bandsaw was switched on.

The current transformer must have a load on the secondary side.
I don't have the circuit unfortunately, as I just made it up as I went along.
Fairly simple though. Used if for about 3 years now, with no problem.

Dave.

15th Dec 2020, 5:30 pm	#5
Vintage Engr Heptode Join Date: Jan 2008 Location: Shrewsbury, Shropshire, UK. Posts: 838	Re: Advice on mains current sensing, safely I used a small current transformer, & a couple of transistors & a relay. This was to turn on my workshop vacuum cleaner when the bandsaw was switched on. The current transformer must have a load on the secondary side. I don't have the circuit unfortunately, as I just made it up as I went along. Fairly simple though. Used if for about 3 years now, with no problem. Dave.