The 3EK7 medium voltage silicone insulated surge arresters from Siemens are designed to provide superior protection against power surges for the equipment in electrical distribution systems with operating voltages of up to 72.5 kV. The product is highly resistant to all kinds of environmental pollution, has excellent performance in dealing with earth faults and short circuits, and is made of lightweight and durable silicone rubber material.
The Siemens 3EK7 is a medium‑voltage surge arrester with a silicone‑rubber housing, glass‑collared MOV blocks and FRP rod cage, offering high mechanical strength and hydrophobic protection.
The data sheet lists electrical ratings such as 60 kV rated voltage and 48 kV continuous operating voltage, mechanical limits like 350 Nm cantilever load, temperature range –55 °C to +50 °C, and includes part numbers, accessory drawings and compliance information.
| Rated voltage | 60 kV |
|---|---|
| Maximum continuous operating voltage | 48 kV |
| Nominal discharge current | 5 kA |
| Operating temperature range | -55 °C to +50 °C |
| Maximum installation altitude | 3600 m a.s.l. |
The rated voltage is 60 kV.
The maximum continuous operating voltage is 48 kV.
The nominal discharge current is 5 kA (10 kA for heavy‑duty versions).
It can operate from –55 °C up to +50 °C.