I have a circuit similar to the following:
The peak current can get up to ~120A for about half a microsecond. The SCR will take care of the 'hot' switching -- the relay is just there to configure the load and other components not shown here.
I'm having a difficult time finding any specs on pulse current ratings through relay contacts. I've had my eye on the Omron G7L-2A-X, which is rated for 25A, but it's hard to cough up ~US$100 for a relay that could turn to smoke with one operation. Is there a way to determine whether a relay can repeatedly survive such conditions without just buying one and trying it? Are there rules of thumb to go by?