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QFL-1(13) Required to be backed up by a QA MCB Clip-in, Dual mounting Surge protection Thermal disconnect device to prevent potential thermal runaway problems One port SPD (no series impedance) Voltage limiting / clamping type SPD LED induction of the SPD condition, whilst ON, the SPD is functional, if OFF and the mains power is still available, then the SPD is no longer functional and should be replaced One port SPD (no series impedance) Compact size