SP2 series SPD for power supply is a single terminal voltage limiting SPD for indoor installation, suitable for TT, IT, TN-S, TN-C, TN-C-S power supply system with AC 50/60Hz, 230/400V and below, suitable for protection of low voltage power grid system and various kind of electrical equipment and control system, to limit the instant over voltage that is higher than the equipment’s withstand impulse voltage, to discharge the surge energy, and by make voltage limiting to all kind of surge over voltage, thus to protect the system circuit and equipment. 

Standard: GB18802.1, GB18802.12, IEC61643-1, IEC61643-21, UL1449 ed.2