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vacuum interrupter for railway medium voltage breaker rated voltage line to line 36 kVrated voltage line to earth 17,5 kV power frequency and BIL 50/125 kV (70/170 kV preferrable)rated frequency 50 Hz (VI will be type tested at 16,7 Hz)short circuit breaking 40 kA at 16,7 Hz (63 kA or more at 50 Hz)short circuit making 100 kA medium voltage, vacuum interrupter, 36/50/125 kv vacuum interrupter