You should be able to get them from GE Industrial supply, but probably special order.

There is at least one online supplier that used to list them.

On the 2nd or 3rd page of this folder there are a couple of long threads about LV switches.

Read through those. I believe that other compnay is listed.

Thank you for the information. I was able to order the relay from GE Supply. Called them at 1/800/243/7313 and found out that "RR8" has been superceded by "RR9". They are still manufacturing them, so hopefully we won't have to replace our system. At least not for a while.