Directly connected to the line, providing instantaneous response to overvoltage protection. Offers superior protection margins for transmission towers. Suitable for: 66kV, 110kV, 132kV, 220kV, 330kV, 400kV, 500kV. 

Designed with an external series gap, this type remains isolated from the line voltage during normal operation, eliminating power frequency leakage current and reducing aging. Ideal for: 66kV, 110kV, 132kV, 220kV, 330kV, 400kV, 500kV. 

Different from fixed arresters, it comes with an automatic drop‑out disconnector, serving as smart overvoltage protection for power distribution networks.