Surge arresters

Protection and Reliability for Power Networks Surge arresters play a crucial role in protecting power networks and equipment from overvoltages. Their presence is essential to enhance the quality and reliability of electricity supply. At Ensto, all products are manufactured using high‑quality raw materials and components, whose conformity and performance are rigorously tested and controlled. VARISIL™ surge arresters are designed with a strong focus on sustainable development, minimizing resource consumption during manufacturing and enabling easier dismantling at end of life. Optimized and Eco‑Friendly Design The use of raw materials with exceptional electrical and mechanical properties allows us to design more compact products, thus conserving global resources and reducing waste. When required, the different components can be separated easily and quickly to support efficient end‑of‑life management and disposal. Ensto has been manufacturing its own polymer‑housed metal oxide surge arresters for over 30 years under the VARISIL™ trademark. This long experience ensures reliable, proven performance, including in the harshest environmental conditions. Compliance with International Standards Ensto products are developed and produced under a Quality Management System certified to ISO 9001, ISO 14001, and ISO 27001, based on the 2015 editions. All VARISIL™ surge arresters meet the requirements of IEC 60099‑4, including the updated classification introduced in 2014 and its associated performance levels. Both type tests and routine tests are performed accordingly.