Does anyone know of a manufacturer of DC contactors rated for 600 VDC and rated for 10 Amps or below (120 VAC coil)? All the Contactors I found the ratings start much higher.
I'm a little perplexed about your question... I wonder what you are really looking for.
600VDC x 10Amp = 6000 Watts
Sounds like a big contactor to me. One that has very big contact points with very large air-gaps between the contacts and any other parts in the relay. The 120VAC Coil would probably be pretty heavy... more than 1-Amp.