... long life 3)reliable 1, Product Name: Indoor high voltage Vacuum Circuit Breaker 2, Product Type:CLZN63-12(VS1) 3, Product Introduction ... Vacuum Circuit Breaker is adopt advanced CAD/CAM/CAE design and produce technology ,it is a new type high voltage products developed ... by our company .This circuit breaker is suitable for AC 50HZ,rated voltage 12KV and below ...