I don't see the point of paralleled contactors. The critical part is
make and break, not steady state current. The danger is that contacts
will be damaged or welded together by the arc that occurs on make/break.
One of the contactors is always going to close/open before the other, so
the probability of damage is not reduced by having two. If one of them
welds itself shut (happened to me), then it doesn't matter if the other
one doesn't!
If one of these isn't big enough, then you need to replace both of them
with a bigger one.
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 01/03/2023 16:08, jim.thom jim.thom@telus.net wrote:
Here, 3 x paralleled 8 ga Teflon wires (silver plated, and stranded) are
used to wire each side of the incoming 240 vac mains...to the pair of
paralleled 3 pole contactors. A 3rd contactor (double pole) will be later
installed for the HV step start. Right angle drive to be installed on the
small 240 vac variac, through the rear panel, so fil V can be dialed in.
Incoming line cord is 3 ga....and is 10' long. Other end can be trimmed off
as required, and will be hardwired into a small 125 amp sub panel, then off
to main panel.
https://www.youtube.com/watch?v=OokpV9aEG9A
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