Model : 8031 Phase Indicator with Open Phase Checker Brand : Kyoritsu CE Type : Standard Type Operational Voltage : 110 - 600VAC Time Limit for Continuous : >500V - Within 5 Minutes Frequency Response : 50/60Hz Applicable Standards : IEC 61010-1 CAT III 600V Pollution Degree 2 Withstand Voltage : 5550VAC for 1 Minute