I'm looking for a mechanical relay that can run 500 amps when closed. There are solid state solutions for switching such currents (SSRs, IGBTs, etc), and we do use them, but for a low speed H-bridge to polarity-invert some coils, I would rather avoid all the voltage drop of using IGBTs. I would not need to "hot switch" the full 500A, the switching would only take place when no current was running.
Parts that I've come across:
Omron G9EC series: Rated to 200A, with an exhaustive datasheet that looks trustworthy.
Stinger "SGP35" relay: supposedly rated to 500A, but the datasheet doesn't instill much trust. See for yourself: http://www.stingerelectronics.com/productDetails.aspx?ProductId=89&CategoryID=2
Has anybody got experience with either of these, or with other high current mechanical relays?