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ZN73D-12 Indoor AC High Voltage Vacuum Circuit Breaker

ZN73D-12 Model indoor AC high-voltage vacuum circuit breaker is a type of indoor HV switchgear of rated voltage 7.2-12kV, three-phase AC 50/60Hz. The VCB conforms to GB/T 1984 High voltage AC vacuum circuit br eaker, JB3855 3.6-40.5kV indoor AC HV vacuum circuit breaker and IEC62271-100 standard. The VCB can operate frequently with good on-off capability and fast reclose capability. The VCB structure is separate into two parts thatcan either steadily installed or fabricated on the chassis frame as a separate handcart

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ZN73D-12 Model indoor AC high-voltage vacuum circuit breaker is a type of indoor HV switchgear of rated voltage 7.2-12kV, three-phase AC 50/60Hz. The VCB conforms to GB/T 1984 High voltage AC vacuum circuit br eaker, JB3855 3.6-40.5kV indoor AC HV vacuum circuit breaker and IEC62271-100 standard. The VCB can operate frequently with good on-off capability and fast reclose capability. The VCB structure is separate into two parts thatcan either steadily installed or fabricated on the chassis frame as a separate handcart

Ambient condition

1. Altitude: 1000m;
2. Ambient temperature: 25 ~+40 ;
3. Relative humidity: daily average 95 , monthly average 90 ;
4. Earthquake intensity: 8 degree;
5. Applicable occasions should free from inflammables, explosives, corrosives
and severe vibration

Product feature

1. Holistic structure
2. Sealed spark chamber
3. Effective vacuum arc-extinguish
4. Good mechanical behavior
5. Various mounting approach



no. item unit data
1 2 3 4 5
1 rated voltage kv 12 12 12 40.5 40.5
2 rated current A 1250 1600 2000 1600 2000
3 rated short circuit breaking current KA 31.5 31.5 31.5 25 31.5
4 Dynamic and stable current (peak) KA 100 100 100 80 100
5 Thermal stability of 4 s 
current 50 ka (3 s)
KA 31.5 31.5 31.5 25 25
6 The rated short circuit close
current (peak value)
KA 100 100 100 80 80
7 Rated short circuit breaking
current times
TIME 50 30

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