Item | Unit | Data |
Rated voltage | kV | 12 |
Rated insulation level | 1min power frequency withstand voltage | kV | 42 |
Rated lightning impulse withstand voltage | kV | 75 |
Rated frequency | Hz | 50 |
Rated current | A | 630 | 630，1250 | 1250，1600，2000， 2500，3150，4000 | 1250，1600，2000， 2500，3150，4000，5000 | 3150， 4000， 5000 |
Rated short-circuit breaking current | kA | 20 | 25 | 31.5 | 40 | 50 |
Rated short time withstand current | kA | 20 | 25 | 31.5 | 40 | 50 |
Rated peak withstand current | kA | 50 | 63 | 80 | 100 | 125 |
Rated short-circuit closing current(peak) | kA | 50 | 63 | 80 | 100 | 125 |
4 seconds thermal stabilization current | kA | 20 | 25 | 31.5 | 40 | 50 |
Rated dynamic stabilization current | kA | 50 | 63 | 80 | 100 | 125 |
Item | Unit | Data |
Rated voltage | kV | 24 |
Rated insulation level | 1min power frequency withstand voltage | kV | 65 |
Rated lightning impulse withstand voltage | kV | 125 |
Rated frequency | Hz | 50 |
Rated current | A | 630 | 630，1250 | 1250，1600，2000， 2500，3150 |
Rated short-circuit breaking current | kA | 20 | 25 | 31.5
|
Rated short time withstand current | kA | 20 | 25 | 31.5
|
Rated peak withstand current | kA | 50 | 63 | 80 |
Rated short-circuit closing current(peak) | kA | 50 | 63 | 80
|
4 seconds thermal stabilization current | kA | 20 | 25 | 31.5
|
Rated dynamic stabilization current | kA | 50 | 63 | 80
|
Core Technology & Construction
Vacuum Interrupter: The heart of the VCB is its vacuum interrupter, which uses a vacuum-sealed chamber (maintained at ~10⁻⁶ bar) to extinguish arcs efficiently. This design ensures rapid arc quenching within microseconds after current zero-crossing, leveraging the vacuum's superior dielectric strength (8x that of air) .
Embedded Pole Structure: The vacuum interrupter and conductive components are fully encapsulated in epoxy resin, forming a monolithic "embedded pole." This design eliminates external insulation concerns (e.g., SF₆ gas or air) and provides robust protection against dust, moisture, and mechanical stress .
Advantages
Compact & Modular: The embedded pole design reduces overall size by 30% compared to traditional VCBs, enabling space-saving installations in switchgear cabinets .
Maintenance-Free Operation: The hermetically sealed vacuum interrupter eliminates the need for periodic gas refilling or contact replacement, lowering lifecycle costs .
High Reliability: Factory-tested under extreme conditions (e.g., temperature cycling, humidity), the VCB ensures stable performance in harsh environments like chemical plants or mining sites .
Smart Monitoring: Optional integrated sensors provide real-time diagnostics (e.g., contact wear, operating coil health), supporting predictive maintenance .
Applications
Power Distribution: Ideal for protecting transformers, feeders, and capacitor banks in utility grids.
Industrial Use: Suitable for motor control centers (MCCs), large machinery, and renewable energy installations (e.g., wind farms).
Railway Systems: Used in traction power substations to handle high inrush currents from electric locomotives .
Safety & Environmental Benefits
Fire & Explosion-Proof: No flammable components (unlike oil circuit breakers) or toxic gases (unlike SF₆ devices), ensuring safe operation in critical facilities .
Low Carbon Footprint: Eliminates SF₆ emissions and reduces energy consumption through efficient arc quenching .
