Surge Protective Devices Surge Protection Application EBS9U Surge protective devices ( referred as SPD) provide protection against surge current resulted from direct or indirect lightning strike or similar surge voltage. SPD is applicable to circuit with rated voltage up to 400V~, rated frequency 50/60Hz. The product, using metal oxide varistor, designed to protect both phase and neutral line, is of high electricity resistance under normal operation. In case of surge current or voltage caused by lightning strike or similar, SPD functions quickly to conduct the surge voltage/current to earth and thus effectively prevent the downstream equipment of its protected line from destruction. SPD resume its high electricity resistance to secure normal operation of the protected power network without presence of the surge voltage. Technical Parameter Model nameEBS3U-40StandardIEC61643-11Poles1P, 2P, 3P, 4PMax. continuous operation AC voltage Uc275V ACNorminal discharge current (8/20μs) In20kAMaximum discharge current (8/20μs) Imax40kAVoltage protection level (L-N) Up1.8kVResponse time (L-N) tA25nsMounting36mm Standard GuideCross section of wire (Min.)4mm2Cross section of wire (Max.)35mm2Casing materialThermoplastic UL94-V0Dimension (L*W*H)90*70*54mmApplication One-unit type assure the stability of product ON-OFF indicating window Quick response less than 25ms