Efen ow-voltage surge arrester device is constructed with nominal discharge current range of 5 to 10 kA, installed within overhead line grid systems. It is enhanced with a metal-oxide varistor gear, and supported by an optimized aging-resistant ceramic enclosure. This arrester delivers fast output response within nanoseconds and with low residual voltage performance. It is offered in insulated and non-insulated model types for a range of mounting setups and terminal designs.