I don't think you can for environments with continuous exposure - http://www.rstahl.com/fileadmin/Dateien/tgus/Documents/ExProtection_Global-America-Basics.pdf

I don't think you can for environments with continuous exposure - http://www.rstahl.com/fileadmin/Dateien/tgus/Documents/ExProtection_Global-America-Basics.pdf http://www.rstahl.com/fileadmin/Dateien/tgus/Documents/ExPro... usually there is a requirement not to use any relays that have physical contactors and other similar parts.