... traffic, military, railroad, scientific culture, etc, where need voltage stabilization. Main t echnology characteristics (DBW.SBW series single-phase ... three-phase four-wire phase voltage 220±20%, wire voltage 380V±20% or phase voltage 220±30%, wire voltage 380V ± 30%, they ... voltage 2,000V for 1 min without breakdown or flash over. m. Overload capability: 2 times rated current, keeping 1 min (voltage ...