Surge arresters play a vital role in protecting electrical systems in both distribution and transmission networks. These devices are designed to safeguard equipment from transient overvoltages, often caused by lightning strikes, switching operations, or faults in the network. When an overvoltage occurs, surge arresters quickly redirect the excess energy to the ground, preventing damage to sensitive components such as transformers, circuit breakers, and insulators. In transmission networks, surge arresters are typically installed at substations or along overhead lines, while in distribution systems, they are placed near transformers or at key network junctions to enhance system reliability and minimize downtime.
This protection ensures the continuous operation of the electrical system, reducing the risk of equipment failure and service interruptions. By minimizing damage, surge arresters also help reduce maintenance costs, extending the lifespan of electrical assets. Their reliable performance contributes to a stable and cost-effective power supply, making them a key element in maintaining the integrity and efficiency of both transmission and distribution networks.
With more than 75 years of experience in overvoltage protection, Ensto offers products and solutions that substantially contribute to higher quality, reliability and availability of power supply networks. Indeed, more than 5 million VARISIL™ surge arresters are now in service worldwide to ensure an efficient protection.
Designed and manufactured surge arresters to the highest standards and its, wide range of products, ensures years of maintenance-free service in the following segments:
- Distribution network
- Substation or Transformer
- Railway
- Cable sheath
Ensto' surge arresters are essential for:
- Protecting electrical equipment
- Ensuring service continuity
- Reducing maintenance costs
