Self holding (latching) Contactor

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22 Oct 2020 23:27 #186941 by BeagleBrainz
So I have a couple of 3 phase contactors with 24V DC coils that I'm using to switch single phase ( Actvice & Neutral ) to some PSUs.

As I'm only using 2 of the 3 contacts of the contactor can I use the 3rd contact ( 24VDC ) to latch the contactor on or do I need a few more Aux contacts ?

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23 Oct 2020 06:06 #186975 by Aciera
As a workaround that certainly works. Only issue might be that in the 24V branch the current might not reach the specified wetting current of the contactor and you might get oxidized contacts. Doesn't happen often but just so you know.

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23 Oct 2020 06:55 #186976 by BeagleBrainz
Cheers.
It would only be coil current, about 300ma. I guess I can only give it a try and see how I go.

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