NVS1-12 Series Indoor High Voltage Vacuum Circuit Breaker

Short Description:

Product Detail

Product Tags


Our new products, NVS1-12 series indoor high-voltage vacuum circuit breakers are used for switchgears in 12kV power system, as a control and protection unit of electrical equipments in industrial and mining enterprises, power plants and substations. Due to the special advantages of the vacuum circuit breaker, it is especially suitable for frequent operations requiring rated working current, or places where the short-circuit current is broken multiple times. The circuit breaker adopts the integrated design of operating mechanism and circuit breaker body. The two are a front and back structure, which is with reliable interlocking function. The circuit breaker can be used as a fixed installation unit. It can also be equipped with a chassis truck into a hand cart unit.


Product standards

GB/T1984-2014 High voltage AC Circuit Breaker

JB/T3855-2008 3.6-40.5kV indoor AC High voltage vacuum circuit breaker

DL/T403-2000 12kV-40.5kV high voltage vacuum circuit breaker ordering technical conditions

IEC62271-100:2008 High Voltage Switchgear and Controlgear Part 100: AC Circuit-breakers


Environmental Conditions

Ambient temperature: -15 C ~+40C

O Ambient humidity: Daily average relative humidity < 95%

Daily average vapour pressure < 2.2X10MPaMonthly average relative humidity < 90%Monthly average vapour pressure < 1.8x10%MPa;

O Altitude ≤ 1000m;

O Earthquake intensity < grade 8:

O Installation spot: The spot should have no waterlosion danger, seriouspollution, chemical corrosion and exquisite shake.


Main Technical Parameters

Item Unit Data
Rated voltage kV 12
Rated frequency Hz 50
Rated 1 min power frequency withstand voltage (phase to phase, to earth, fracture) kV 42
Rated lightning impulse withstand voltage (phase to phase, to earth, fracture) kV 75
Rated operation sequence   O-t-CO-t’-CO


Item Unit


Rated current A 630 1250 1250 1600 2000 2500 1250 1600 2000 2500 3150 3150 4000
Rated short circuit breaking current kA 20 / 25 31.5 40 50
Rated short circuit making current (peak) kA 50 / 63 80 100 125
Rated duration of short circuit s 4 4 4 4
Rated short circuit breaking times time 50 50 30 20
Mechanical life time 20000 20000 20000 10000



20/25/31.5kA, t=0.3s   t’=180s

40/50kA, t=180s, t’=180s

4000A VCB need forced air cooling


Item Unit Data
Clearance between open contacts mm 9±1
Overtravel 3.5±0.5
Three phase opening and closing asynchronism ms ≤2
Contact closing bounce time ms ≤2 (50kA)
Contact pressure of closing contacts N 20kA 25 kA 31.5 kA 40 kA 50 kA
2000±200 2400±200 3100±200 4250±250 5500±300
Average opening speed m/s 0.9~1.3
Average closing speed 0.4~0.8


General Structure Drawing and Installation Size (unit: mm)


1NVS1 dimension1 1NVS1 dimension2 1NVS1 dimension3

NVS1 dimension4


  • Previous:
  • Next: