ZeroDT is Million Dollar Protection in a Size Smaller Than a Quarter. This technology possesses several attractive characteristics most surge protection lacks. Silicon Avalanche Suppression Diodes or (SASD) do not degrade with use. They act simply as a voltage controlled switch, turning on/off thousands, even millions of times without losing their original performance. ZeroDT is UL Certified. /// UL listed - Isolated Loop Circuit Protector (E499683) /// UL listed - Isolated Loop Circuit Protector for use in Hazardous Locations (E502612) /// Class 1, Division 2, Groups A, B, C and D Hazardous locations (T6) Tamb = -40°C to 80°C /// RoHS Compliant. Experience the world's fastest surge protection and Zero Down Time. Every industry from petrochemical to wastewater to natural gas pipelines, can protect millions of dollars in equipment and prevent costly downtime. We're trusted by some of the world's largest industrial companies. Downtime is money. Downtime is the biggest cost risk in the measurement and automation industries. Because our products are so reliable, high-performing and non-degrading, we have saved companies billions in lost revenue. When you can't measure, you can't bill. When you can't bill customers, you don't make money. Other products fail, ZeroDT doesn't. Would you rather have your operations dependent on faulty protection? In the average time it takes you to blink your eye, a single ZeroDT product has equally and consistently suppressed overvoltages at least 80 MILLION times.