Overview: ZN63 (SV1) -12-type side-mounted vacuum circuit breaker is indoor high voltage switchgear for rated voltage of 12kV, frequency 50Hz three-phase power system protection and control of electrical appliances as, due to the special vacuum breaker advantages, especially for applications that require frequent operation at rated current, open circuit breakers or multiple current location. ZN63 (SV1) -12-type side-mounted vacuum circuit breaker fixed installation, mainly for fixed switchgear, the circuit breaker can be used alone, but also for power supply ring main technical parameters Item Unit Data 1 Rated voltage KV 12 2 maximum operating voltage KV 630 630 630 3 Rated current A 630--1250 1250 1250 4 rated short-circuit breaking current KA 20 25 31.5 5 rated short-circuit current KA 50 63 80 6 rated peak withstand current KA 50 63 80 7 4S rated short-circuit withstand current KA 20 25 31.5 8 rated insulation level power frequency withstand voltage KV 42 (fracture 48) impulse withstand voltage (rated breaking before and after) (rated breaking before and after) 75 (fracture 84) rated operating sequence 9 points -0.3- close together in 10 minutes 180s- Mechanical life 100,011 times the rated short-circuit breaking current breaking times 5012 operating mechanism closing rated voltage (DC) V 110,220 13 operating mechanism rated gate voltage (DC) V 110,220 14 contact stroke mm 11 ± 1 15 overtravel (contact spring compression length) mm 3.5 ± 0.5 16 three-phase points, closing bounce time ms ≤2 17 Contact closing bounce time ms ≤2 18 Average opening speed m / s 11 + ~ 0.2 19 Average closing speed m / s 0.3 ~ 0.2 20 opening time under the maximum operating voltage under the minimum operating voltage s ≤0.05 ≤0.08 21 s 0.1 22 closing time of each phase of the main circuit resistance movement υΩ 60 50 23 contacts, allowing wear cumulative thickness mm 3