Specifications: A protector is needed to prevent thunder and lightning from happening in the family house. It is suitable for class C and D lightning protection, and is used for equipotential chain connection during lightning strike. When lightning occurs, it can respond quickly, unload the voltage, and protect the safety of household appliances and you. This product can protect electric system and on-loading electrical apparatus from thunder and instantaneous over-voltage. Made of high quality PC flame retardant shell, it is durable, safe and easy to use. Item Name: 3P Surge Protector Material: Flame Retardant Plastic Model: LT1-20KA, LT1-40KA Maximum Continuous Working 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#: Orange LT1-20KA 20KA 1.5KV 4#: Orange LT1-40KA 40KA 1.8KV Installation Requirements: Use Standard 36mm Din-rail to Install and Use With Circuit Breakers in The Distribution Box Features: Durable, Easy to Install, Lightning Protection Size: 9cm x 5.3cm x 6.7cm(Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x 3P Surge Protector