In your link is a three phase contactor for a compressor that uses interlock buttons. It is a three pole N.O. (normally open) contactor with one normally open and one normally closed switch for interlocking with the power buttons. How many volts.... coil and contacts ? Typical contactors are N.O. You'd need a HD relay if you require N.C. contacts. Just as an example.... a two pole NC contactor, 63A contacts, 110-120v coil.