Relay question

[johu]

I am looking for a low profile, 2-pole contactor for my ChaDeMo port. I have a few Finder 30A relays here similar to this: https://www.reichelt.de/leistungsrelais ... 7.html?r=1

It has 30A switching capability. It will never switch under load. Does it mean its conducting capability is higher? By how much?
I loaded it down with 27A today and thereby found it has 1.5mOhm resistance measured from the inputs. With R*I² we get losses per contact of

• 1.35W @ 30A
• 2.4W @ 40A
• 3.75W @ 50A
• 5.4W @ 60A

3.75W sounds like it can be dissipated into the air. It would mean I could charge at 20kW. What is the max charge current of the 24kWh Leaf cells?

Alternatively I have a 400A KiloVAC contactor here.

[arber333]

Maybe you want to use a Leaf 40A relay or even beffier contactor.
They have silvered contacts and magnet under its contacts to suck up any plasma arc that forms on contact opening.
viewtopic.php?f=9&t=335#p3774

or a beefier one that i took from Ampera. You can find similar items in a Leaf.
viewtopic.php?f=9&t=335#p3781