... need power cut Response time<25ns According to IEC61643-1, GB18802.1 many colors for you Product DescriptionCAN-D20 series surge protection ... short: SPD, alias: surge suppressor, surge arrester) is suitable for TN-S, TN-C-S, TT, IT etc. power supply system of AC ... the failure release will help electric equipments separate from the power supply system and give the indication signal, green means normal ...