Differences in Surge Protective Device Standards

This white paper explores the differences in classification, parameters, and testing methods of Surge Protective Devices (SPDs) as per UL 1449 5th Edition and IEC 61643. It provides essential insights for engineers on selecting the right SPD for various applications, detailing key parameters such as Impulse Current, Maximum Discharge Current, and Voltage Protection Ratings. Understanding these standards is crucial for ensuring compliance and optimal protection for electrical systems.