The DC Surge Protctor (DC SPD) mainly used for DC distribtion, such as solar generate system, wind power system, automotive power supply systems, etc. It protects when lightning damages the line. Its has an instruction window that can indicate whether the line has been struck by lightning.If the red indicator indicates that the line has been struck by lightning, please replace the protector or module in time.Technical Parameters Discharge current (In): 20KA, 40KA, 60KA Poles: 2P, 3P Working voltage (Uc): DC 500V, DC 800V, DC 1000V Poles: 2P ( 2 Poles ), 3P (3 Poles) Indicate: Green(Working well), Red(Fault, product or module needs to be replaced ) Working temperature: -40C+85C Voltage shock level2.2KV-5KV Installation conditions: Vertical (standard rail mounting) Standard: EC61643-1 Warraty: 18th MonthCircuit Wiring Recommend 1. Please use the protector in combination according to the actual load and circuit, and select an appropriate current Amp.2. The product can be installed upside down without affecting the service life and protection abilityProduct Size (Unit mm) Structure Introduction 1: Terminals (Maximum 25mm2 (4 AWG) cable can be connected).2: Status window, if the indicator is red, it means that the protector hasbeen struck by lightning, please replace the module or product in time3: Rail mounting buckle, the circuit breaker can be directly installed on the DIN rail without screwsMounting and Fixed DPLY can be fixed on DIN rail directly, can be placed in a distribution box Please try to keep the vertical installation, and use the top-in and bottom-out wiring method, in order to obtain the best protection performance and the longest service lifeAbout Shipping1, No more than 2kg weight:Shipping by Aliexpre Standard (20-35days)Shipping by China Post (20-35days)2, More than 2kg weight:Shipping by Aliexpre Standard (20-35days), China Post (20-35days), FEDEX (7-15days), UPS (7-15days), TNT (7-15days), other expre direct lines (10-20days). We will choose the appropriate logistics according to the actual situation3, Above delivery date is applicable for most cases. However sometimes parcels may be delayed fo holiday, festival, bad weather, custom, Etc. Besides Expre shipping way may have tax iue. In those case, your comprehension and cooperation is highly appreciated4, Shipping ways and track website: Receiving and After-sales Service1, Please check the tracking information on tracking website2, Please contact us by meage, e-mail, or trade manager3, Check the package and item carefully4, All of our products are backed by a 12-18 month warranty in the event of non-human damage, please contact us and we will replace the product to youWe Need Your Support 1, If you visit our store for the first time, please click "Add Follow" button to collect our store, so that you can get the latest discount and new product notifications in time.2, If your are satisfied with products and our service, please leave 5 stars feedback.3, If your have any questions or problem, feel free to contact us first before you leave negative feedback.We will try our best to solve any problem and provide you with the best customer service