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ZN63A-12 indoor high voltage vacuum circuit breaker

Product description
ZN63A-12KV indoor high voltage vacuum circuit breaker is aindoor equipment with three phase AC 50Hz and rated voltage of 12kV, which can be used for the control and protection of electrical facilities in industrial and mining enterprises, power plants and substations, and is suitable for frequent operation places.
The voltage vacuum circuit breaker can be operated frequently and has the ability to break and reclose multiple times. The product is designed as front-rear assembling structure, it not only can be used as fixed installation unit, but also can be used as handcart unit through equipping with chassis, and has a reliable interlocking function.
ZN63A 12KV circuit breaker meet the standards: GB/T1984 and JB/T3855.

Working condition
1. Ambient air temperature: -15~+40℃
2. Altitude: ≤2000m
3. Humidity: Daily average value ≤95%,Monthly average value ≤90%;
4. Water vapor pressure: Daily average value ≤2.2kPa; Monthly average value ≤1.8kPa
5. The external shocking and earthquake could be neglected
6. No operating in such places as subject to dust, smog, corrosive / flammable gas, vapor and salt pollution.

Technical Specification
Rated voltage: 12kV
Rated lightning impulse withstand voltage (peak): 75kV
1min power frequency withstand voltage: 42kV
Rated short-circuit breaking current: 20, 25, 31.5, 40kA
Rated current: 630, 1250, 1600, 2000, 2500, 3150, 4000A
Rated thermo stability current (valid): 20, 25, 31.5, 40kA
Rated dynamic stability current (peak): 63, 80, 100kA
Rated short-circuit making current (peak): 50, 63, 80, 100kA
Rated operations of short-circuit breaking current interruption: 50times
Power frequency withstand voltage of secondary circuit (1min): 2000V
Rated operation sequence: O-0.3s-CO-180s-CO;O-180s-CO-180s-CO(40kA)
Rated thermo stability time: 4s
Rated back to back capacitor bank breaking current
Mechanical life: 20000times; 10000 times (40kA)



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