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11kV Vacuum Circuit Breaker Specifications and Selection Guide
Meta Description: A guide to the 11kV Vacuum Circuit Breaker. We explain technical specs, ratings, and why Enwei Electric's 11kV VCBs are the top choice for reliability.
Keywords: 11kV Vacuum Circuit Breaker, Enwei Electric, 11kV VCB, medium voltage protection, electrical distribution
The 11kV voltage level is one of the most common distribution voltages worldwide. Consequently, the 11kV Vacuum Circuit Breaker is perhaps the most widely used piece of medium voltage protection equipment. Whether for a small factory or a large residential complex, getting the specification right for this breaker is crucial.
Technical Specifications and Ratings
When selecting an 11kV Vacuum Circuit Breaker, several key ratings must be considered:
- Rated Voltage: Usually 12kV (the maximum system voltage).
- Rated Current: Typically ranges from 630A to 4000A depending on the load.
- Short Circuit Breaking Capacity: 20kA, 25kA, or 31.5kA are standard. This must match the fault level of your network.
- Rated Power Frequency Withstand Voltage: 42kV (1 min).
- Rated Lightning Impulse Withstand Voltage: 75kV (Peak).
Why 11kV VCBs Dominate the Market
Vacuum technology is particularly well-suited for 11kV applications. The contact gap required to withstand 11kV in a vacuum is very small (less than 10mm). This allows for compact, lightweight operating mechanisms that require low energy to close and open. This efficiency translates to lower costs and higher reliability compared to SF6 at this voltage level.
Enwei Electric's 11kV Solutions
Enwei Electric offers a premium range of Circuit Breakers tailored for 11kV networks. Our VCBs are designed to fit seamlessly into standard panels or can be supplied as loose breakers for retrofit projects. We prioritize safety with robust interlocks and high-quality insulation materials.
Conclusion
For buyers and engineers comparing 11kV vacuum circuit breaker specifications, the key ratings are usually a 12kV rated voltage, 630A to 4000A rated current, 20kA, 25kA or 31.5kA short-circuit breaking capacity, 42kV power frequency withstand voltage and 75kV lightning impulse withstand voltage. These values help determine whether the VCB is suitable for an 11kV distribution network, factory substation, switchgear panel or retrofit project.
Image Suggestions
- Image: https://www.enweielectric.com/products/circuit-breakers
- ALT: "11kV Vacuum Circuit Breaker Front View"
- Image: https://www.enweielectric.com/products/switchgear
- ALT: "11kV Switchgear Panel Internal View"
