Circuit-breakers series BP35NSM with spring drive are used in 35 kV outdoor switchgears of modular transformer substations types KTPBR-220/35/10(6), KTPBR-150/35/10(6), KTPBR-110/35/10(6), KTPBR-М-35/10(6) and blocks of complete switchgears in railway traction substations as well as for extension of existing substations and replacement of outdated air and oil circuit-breakers at them.
Circuit-breakers series BP35NSM consist of four main parts, namely:
The pole of BP35NSM circuit-breaker consists of vacuum interrupter, supporting covers, insulating tie-rod, upper and lower terminals, fasteners and parts for sealing the pole. Upper and lower parts of the pole are made of fibreglass pipe externally covered with finned organosilicon insulation.