(1) the contact distance is small, and the contact distance of 10KV vacuum circuit breaker is only about 10mm, so the operating work of the operating mechanism is small, the mechanical part has a small stroke, and its mechanical life is long.

② The arcing time is short, and has nothing to do with the switching current, generally only half cycle.

(3) After arc extinguishing, the medium in the contact gap recovers quickly, and the fault performance in the near-breaking area is good.

(4) Because the abrasion is small when the current is cut off, the electrical life of the contact is long, the full capacity is cut off for 30-50 times, and the rated current is cut off for more than 5000 times, so the noise is low and it is suitable for frequent operation.

⑤ Small size and light weight.

⑥ Suitable for interrupting capacitive load current.

Because of its many advantages, it is widely used in substations. At present, the main models are: ZN12-10, ZN28A-10, ZN65A-12, ZN12A-12, VS1, ZN30 and so on.