Single-pole circuit-breakers series BP27NS are used as component parts for blocks of complete switchgears series KRP(B)-27,5 in traction substations, switching stations and points of parallel connection of railroad sections contact line as well as for extension of existing substations and replacement of outdated air and oil circuit-breakers at them.
Circuit-breakers series BP27NS consist of four main parts, namely:
External finning and internal insulation of poles are solid-cast, including the vacuum interrupter casting. The creepage distance of external insulation is increased up to the III pollution level.