Welcome to our Store Please tell us first when you have any problem, we will give you the best service and solve the problem ASAP. Thank you so much. Application:Protect electric system and on-loading electrical apparatus from thunder and instantaneous over-voltage.Product:DCSURGEPROTECTIVEDEVICECode:LY1-40CNumber of poles:2PElectric ratings:500VDC, 1000VDCIn(8/20)us(KA) :20KAImax(8/20)us(KA):40KAStandard:GB 18802.1-2011Characteristic Curve:B,C,DWorking Temperature:-5to +40Protection Degree:IP20Electrical life:More than 8000timesMechanical life:More than 2000timesDimension(W)X(H)X(D):36x90x48Installation:35MM DIN RAILAcceory:Remote signalInstallation Altitude:2000MUP<3.5KV100% brand new and high qualityPackage Content: 1Pcs x Surge protective deviceNote :1.The more you order,contact me,the more cheaper price will be.2.A variety of specifications for your choice, please check carefully or ask customer service before placing an order.3.Due to the difference between different monitors, the picture may not reflect the actual color of the item.4.The size is measured by hands, please allow minor error of measurement. please refer to the physical measurement.Thank you!!