Tyco EV200AAANA contactor. High voltage relay rated for up to 900V DC and 500A continuous carry and will break 2000A at 320V. Built in coil economizer uses only 1.7W @ 12V. Hermetically sealed and intrinsically safe.
(GST exc. $246.95)
Tyco Mini K HV - Precharge Relay
$
147.00
Finally available is a small format automotive style relay specifically designed for enabling precharge of controller circuits.
Also suitable for switching heater cores or DC/DC converters.