SYD1-D Surge Protective Device is applied to TN-S, TN-C, TN-CS, TT power supply systems of AC50/60Hz and 420V, it can protect the grid when lightning and impulse over voltage happened. This product complies with GB 18802.1-2011 standard. Our Service All orders would be shipped within 3 busine days after your payment. Return and refund 1. Please contact us before you ship your order back, we will tell you the return addre, After we received the package , we'll refund or exchange to you . 2. The returned item has to be in its original condition. We are able to refund your money without shipping cost. 3. All refund will be returned to your payment account , about 4~7 busine days. Responsibility and duty 1. We only ship to a confirmed addre and consignee provided by Aliexpre. Before you paid, please make sure your addre and consignee in Aliexpre . 2. The shipping cost is not included any tax and fee . Any charge and fee is buyer's responsibility. Buyer or consignee should bear and pay all taxes and fees of parcel when the parcel arrived in destination country . Contact us If you have any problems, please e-mail us immediately. Good Luck & Have a nice shopping experience! Keep in touch and we hope to see you again soon!