contactor contact sizing help needed

Hello,
I am planning a CNC servo power supply and I need a little help with
contactor (relay) contact sizing. My plan is to use some type of
contactor that has 2 NO contacts to power the AC side of the 3000VA
220V transformer and 2 NC contacts to dump the capacitors into
resistor for an e-stop / table limit situation. My question is this: I
have calculated the DC output of the PS and it will be around 120V @
35A so what size (rated in ACV / Amps) contacts should the relay have
for the DC dump circuit. I have been told to use a 20W 7 ohm resistor
for the load and I presume this is large enough. Please help as I am a
little confused when it comes to the DC. ANy help is always
appreciated.

Larry Olson