EMU-oriented surge arrester is used on the roof of 27.5kV traction electric locomotive to protect the insulators of electrical equipment of the locomotive from being damaged by over-voltage. The product is designed and produced according to Metal-oxide Surge Arrester without Gaps for AC Systems (GB11032) and 27.5kV and 55kV AC Metal-oxide Surge Arrester without Gaps for Electric Railway (TB/T 1844), and has passed the comprehensive type test of the National Quality Supervision and Inspection Center of Insulators & Surge Arresters, with high mechanical strength and reliable protection. For the severe vibration of locomotive roof, the EMU-oriented surge arrester is tested specially for the impact and vibration resistance by Rolling Stock Inspection Station of Product Quality Supervision and Inspection Center of the Ministry of Railways according to the Railway Applications - Rolling Stock Equipment - Shock and Vibration Tests (GB/T 21563, idt IEC61373). The test proves that the arrester meets the requirements of Class A under Type 1 (the highest level) specified by the standard. Therefore, it has reliable resistance against vibration and impact.