This document describes the features and characteristics of 3EP porcelain housed surge arresters, including their reliability and application range in medium and high voltage systems. The products offer excellent overvoltage protection and can be used in various environmental conditions.
The 3EP series of porcelain‑housed surge arresters are designed for reliable over‑voltage protection in medium and high voltage networks, covering applications from 12 kV up to 800 kV. Siemens highlights their high bending moment, short‑circuit current capability, and robust sealing for long service life.
The document guides users through a four‑step selection process, presents detailed technical tables for each type (3EP5, 3EP4, 3EP2, 3EP3), and lists the key advantages of the 3EP surge arresters.
| Nominal system voltage Uo (3EP5) | 110 kV |
|---|---|
| Maximum rated voltage Ui (3EP5) | 96 kV |
| Maximum line discharge class (3EP5) | 3 |
| Maximum energy absorption capability (3EP5) | 8 kJ/kVr |
They are available for applications from 12 kV up to 800 kV.
They offer excellent over‑voltage protection, high bending moment, short‑circuit current capability up to 100 kA, and a robust sealing system for long service life.
The selection process consists of four steps.