Medium-voltage surge arrester 3EK7 series

class IIclass Ifor electrical installations

Siemens Energy 3EK7 silicone rubber surge arresters with cage design effectively protect medium-voltage distribution networks from overvoltage. They are ideally suited to provide reliable protection for: •Transformers •Circuit breakers •Medium-voltage switchgear •Medium-voltage distribution networks The cage, made of fiberglass-reinforced plastic (FRP) rods, provides a rigid, reinforced structure ensuring high mechanical strength. The silicone rubber housing is directly molded onto the metal oxide (MO) blocks and the surrounding cage made of FRP rods. This creates a reliable seal that prevents moisture ingress and partial discharges. The MO resistors are not surrounded by a rigid mechanical coating, which is why no critical increases in pressure can occur in the surge arrester in the extremely rare event of an overload. The arc can escape directly through the soft silicone housing without damaging the mechanical structure. No internal parts are ejected in the process. The innovative Siemens cage design is very secure. The silicone rubber is highly hydrophobic. This keeps any conductive moisture from forming on the surface, and dirt deposits are rendered harmless as a result of the hydrophobic transfer. Silicone is highly fire-retardant and self-extinguishing in the event of fire. These properties ensure the reliable, maintenance-free operation of 3EK surge arresters. Siemens Energy offers 3EK7 surge arresters for use in distribution networks for rated voltages up to 60 kV with very high mechanical strength.