We are a professional factory that produces series of Metal Oxide Arrester (MOA) 3kv-330kv .They are widely used as protective devices against switching and lightning overvoltages in power electrical systems. such as power transformers, distribution pole transformer, and so on. They exhibit an extremely high resistance during normal operation and a very low resistance during transient overvoltages.   Service condition: 1) Ambient temperature: -40°C ~ +40°C 2) Altitude:  less than 1000m 3) Maximum wind velocity: 35m/s 4) Earthquake intensity: 7 degrees, 0.3g 5) Note: any severer condition, please specify Standard applied: IEC60099-4    If you have any plan to import from China and have interests , please rest assured that we are your best choice and do not hesitate to contact us. We will spare no effort to meet your need.