SP1-C series SPD is suitable for TT, IT, TN-S, TN-C-S power supply system with AC 50/60Hz, 230/400V and below. Its design based on IEC6143-1, GB18802.1 and GB50057 standard requirements. Mainly used for protect the low voltage electrical device to prevent the surge current caused by air discharge (such as lightning) or operating over voltage, used as one kind of voltage limiting device, it equipped with heavy duty zinc oxide varistor.

SP1-C type SPD should installed as near as possible to the upstream line side of the protected equipment (immediately connect to the downstream of incoming line), as earthing device to connecting external conductor (L) or neutral line and user equipment. Installed at transition area of LPZOA/OB and LPZ1 zone or LPZ1 and LPZ2 zone, normally installed at the incoming of low voltage main distribution board.