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Description:ML1 series surging protector is suitable for the power supply or communication system of 50 / 60Hz, with rated voltage up to 380V. It can protect the system against indirect or direct lightning effect or other instantaneous over-voltage electric surge. It has the protection modes of phase to phase, phase to earth, phase to neutral line, and neutral line to earth. SPD main technical parameter: 1) SPD of UC=140V, 320V, 385V, 550V, can be supplied for special usage 2) NPE protective mode of UC=420V, can be supplied for special usage more other products from this supplier