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Vs1-12 12kv Indoor High Voltage Vacuum Circuit Breaker Withdrawable Circuit Breaker for Power Substation. Withdrawable trolley structure, easy to install, inspect and maintain, perfectly matching KYN28 switchgear cabinet. High-performance vacuum interrupter, reliable breaking performance, long service life and low maintenance cost. Compact overall design, stable mechanical performance, widely used in 12kV indoor power distribution substation.