Description
VS1 ZN63A 12kV Indoor Vacuum Circuit Breaker Overview
The VS1 ZN63A is a three-phase indoor vacuum circuit breaker for 12 kV systems. The published table covers current ratings from 630 A through 4,000 A, with the 4,000 A entry marked by an asterisk, and short-circuit breaking ratings from 20 kA to 50 kA depending on the current configuration.
Electrical Ratings
| Parameter | Published value |
|---|---|
| Rated voltage | 12 kV |
| Power-frequency withstand voltage | 42 kV |
| Lightning impulse withstand voltage | 75 kV |
| Rated current options | 630 / 1000 / 1250 / 1600 / 2000 / 2500 / 3150 / 4000* A |
| Short-circuit breaking and short-time withstand current | 20 / 25 / 31.5 / 40 / 50 kA according to current configuration |
| Peak making and dynamic-stability current | 50 / 63 / 80 / 100 / 125 kA according to configuration |
| Short-circuit duration | 4 seconds |
| Breaking operations | 50; 30 for 40 kA and above |
| Operating sequence | O–0.3 s–CO–180 s–CO; O–180 s–CO–180 s–CO for 40 kA and above |
Operating Conditions
- Ambient temperature: -10°C to 40°C
- Maximum daily average relative humidity: 95%
- Maximum monthly average relative humidity: 90%
- Maximum daily average saturated vapor pressure: 2.2 kPa
- Maximum monthly average saturated vapor pressure: 1.8 kPa
- Maximum altitude: 1,000 m unless otherwise specified
- Maximum earthquake intensity: 8
- No fire, explosion, severe contamination, chemical corrosion, or violent vibration
Selection Guidance
The current and short-circuit ratings are presented as a configuration matrix, not independent values. Confirm the required current, breaking rating, operating sequence, installation form, control voltage, switchgear interface, and site conditions. The 4,000 A entry is marked with an asterisk and requires confirmation.
Information for an Inquiry
Provide rated current, prospective short-circuit current, operating sequence, switchgear type, fixed or withdrawable installation, control voltage, altitude, humidity, and seismic requirement.
FAQ
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