Thanks BryanG,
I was actually interested in process of buying things from Siemens, it's been a couple of hours that I browse their website to find information to buy a couple of relys from them, but the only thing that I found was a contact address, which I sent an email and received no reply from them. I searched a couple of products which I need along S7 in RS but RS or ebay don't have them. The product is related to high power.
SIPROTEC 4
Thanks,
Sam