Overview

Experience is most essential when it comes to reliability in medium- and high-voltage applications.Siemens has been designing and manufacturing medium- and high-voltage surge arresters for standard and special applications since 1925. Continuous research and development, the wealth of Siemens know-how, and comprehensive worldwide experience give Siemens surge arresters a leading edge in overvoltage protection. Their uncompromising quality ensures a long service life and reliability in any application. Siemens surge arresters are an indispensable aid to insulation coordination in electrical power supply systems. Valuable equipment such as transformers, circuit breakers, generators, motors, capacitors, traction vehicles, and bushings, as well as complete switchgear, is ideally protected against lightning and switching overvoltages.Siemens provides a wide range of surge arrester product families for the protection of medium-voltage systems and components up to 72.5 kV. The selection of the surge arrester depends on the application to be protected:

Distribution systems

Siemens 3EK Cage Design™ distribution class surge arresters are ideally suited for the reliable protection of transformers, circuit breakers, medium-voltage switchgear / panels and distribution lines.

Surge arresters with high energy discharge capability

Next to the typical distribution class surge arresters, Siemens offers the 3EJ Cage Design™ surge arrester product family with higher energy discharge capabilities, providing a low protection level. The 3EJ surge arresters protect rotating devices, like generators and motors, arc furnaces, arc furnace transformers, industrial transformers, airfield-lighting systems, cable sheath, capacitors and capacitor banks and converters for drives.

Special applications

For applications requiring a surge arrester with silicone rubber housing in combination with a directional pressure relief device, Siemens offers the 3EQ0 product line.For the overvoltage protection of generators and motors, which require a very high short-circuit current capability, Siemens offers the 3EP-G porcelain housed surge arresters with short-circuit current capability up to 300 kA.

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