Bulletin 937 Intrinsic Safety Application Technique

This application technique document from Rockwell Automation compares cost-effective intrinsic safety (Ex ‘i’) methods versus traditional explosion-proof (Ex ‘d’) enclosures for installing simple devices like push buttons and RTDs in Class I Division 1 hazardous locations. It explains how Bulletin 937 Intrinsic Safety Modules act as isolators to limit energy, enabling non-rated simple apparatus to be used safely in hazardous environments while reducing installation complexity and cost.