Specifications: A protect is needed to prevent thunder lightning from happening in the family house. It is suitable f class C D lightning protection, is used f equipotential chain connection during lightning strike. When lightning occurs, it can respond quickly, unload the voltage, protect the safety of household appliances you. This product can protect electric system on-loading electrical apparatus from thunder instantaneous over-voltage. Made of high quality PC flame retardant shell, it is durable, safe easy to use. Item Name: 3P Surge Protect Material: Flame Retardant Plastic Model: LT1-20KA, LT1-40KA Maximum Continuous Wking Voltage: 20KA, 40KA Voltage Protection Level: 1.5KV, 1.8KV Number Of Poles: 3P Response Time: 25ns Rated Voltage: 420V AC Specifications: 1 : White LT1-20KA 20KA 1.5KV 2 : White LT1-40KA 40KA 1.8KV 3 : ange LT1-20KA 20KA 1.5KV 4 : ange LT1-40KA 40KA 1.8KV Installation Requirements: Use Stard 36mm Din-rail to Install Use With Circuit Breakers in The Distribution Box Features: Durable, Easy to Install, Lightning Protection Size: 9cm x 5.3cm x 6.7cm/3.54" x 2.09" x 2.64" (Approx.) Notes: Due to the light screen setting difference, the items col may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x 3P Surge Protect