1, ISO9001,IEC,KEMA etc. 2. OEM/ODM 3. Main material: porcelain Zinc oxide arrester ... (YW,HYW,TYPE)1. YW,HYW,type 2. Main material: porcelain3. OEM/ODM4. ISO9001,IEC,KEMA etc. ... an "H" before th spec,in the above table of composite organic housing zinc oxide arrester.* is the rated voltage ... to your reply! we will arrange everything for you. Types of Zinc oxide arrester (YW,HYW,TYPE)