Hi, Jon.
Switching a contactor or relay coil does involve an inrush current and
inductive kickback, as previously mentioned. This can affect air gap contacts
in significant ways.
For solid state switching, I’m less familiar with the ins and outs, but if you
look at some SSR manufacturers’ web
The ultimate issue is what safety issue occurs if the contactor fails to open
or close when it is supposed to? If there is no safety consequence, then the
contactor control is functional, not a safeguard. If there is a safety
consequence, then the circuits controlling the contactor
What accuracy class? If this is for sub-metering, something like this probably
won’t work, but it does meet the cheap requirement:
https://www.olimex.com/Products/Components/Sensors/SNS-CURRENT-CT013-100A/
If you need something more accurate, AEMC has a wide selection of probes, but
they
“Agreement is usually a compromise for both sides.”
Unfortunately, the process denigrates science and engineering (but saves face
for both sides, especially the certification house).
Still cynical Rich
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This
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