Which relay for 21s pack Star/Delta switch?

[rg12]

Hey Dudes,

I have a customer that just showed me his awesome delta switch and he went from 62kmh to 105kmh!
BUT, he fried his relays.

The delta thing requires 3 relays inside the hub motor but finding the right one is a bug headache.

My bike has 21s (about 88v full) LiPo with 45A controller.

First of all, it seems impossible to find high amp with high voltage DC relays.
Can I use AC relay instead?
I heard that some people connect two relays in parallel to get them not to fry...is that really possible?
Also, how much voltage and current goes through each of the phase wires? is it the full 88v 45A or is it divided by three across the 3 phase wires?
When I see a relay that says say 24v, does it mean that the switching voltage is supposed to be 24v or the load voltage?

I know that I need a 5 pin one...

Would appreciate some help since I'm a relay virgin...

 

[Punx0r]

Just run permanently either in star and increase voltage or run in delta and increase current

 

[rg12]

Just run permanently either in star and increase voltage or run in delta and increase current

Permanent star config is stock form and permanent delta means very low torque.
The benefit in this relay setup is that you don't have to go to crazy voltages or those huge 80A beast controllers.