A Vacuum Circuit Breaker (VCB) is a type of circuit breaker where the arc produced during current interruption is quenched within a vacuum environment. Yamuna Power & Infrastructure Ltd., recognized as a leading Indian manufacturer and exporter, provides both 11 kV and 33 kV VCBs with superior build quality and reliable performance.
How a VCB Works
At its core, a VCB uses vacuum interrupter technology—where the contacts separate within a sealed vacuum chamber. As the contacts pull apart, the arc forms briefly but is quickly extinguished without a medium like oil or gas. This design ensures minimal wear and tear on the interrupter and supports exceptionally long mechanical and electrical life spans.
Yamuna Power’s VCB Product Range
12 kV Metal-Clad Indoor VCB
This variant features a robust, powder-coated sheet metal enclosure with multiple compartments for breaker, busbar, CT/cable, and instrumentation. Its design includes rear access to cable terminals, integrated safety shutters, and anti-exposure features for live parts. It is available in both withdrawable and fixed types with mechanical interlocks for secure operation.
Outdoor Porcelain-Clad VCB (Up to 36 kV)
This model offers compact, user-friendly design with hermetically sealed poles, ensuring minimal maintenance and no fire hazard risk. Built for hazardous environments, it supports auto re-closing operations and provides an IP-55 protection rating. Optional enhancements include HDG steel mounting structures, control and relay panels, terminal connectors, and stainless hardware.
Advantages of Vacuum Circuit Breakers
1. Long Operating and Maintenance Life
The vacuum interrupting medium ensures fewer mechanical and electrical wear issues, markedly extending the service life of the breaker.
2. Safety and Reliability
Their hermetically sealed design and robust construction significantly reduce fire risk and environmental exposure. Outdoor porcelain-clad models further enhance this with IP-55 protection.
3. Compact & Modular Construction
Indoor metal-clad VCBs are space-efficient and allow safe, segregated, and interlocked access—enhancing both safety and operational efficiency.
4. Automation Friendly
Outdoor models are designed to support auto re-closing operations, enabling seamless integration into automated protection schemes.
5. Durable Protection
VCBs are built to withstand arcing stresses, thermal overloads, and frequent switching operations—all while maintaining superior electrical performance.
Applications of VCBs by Yamuna Power
Industrial and Power Distribution
Ideal for industrial switchgear systems, power grids, and utilities, Yamuna Power’s VCBs deliver dependable performance and longevity.
Indoor Substation Panels
The metal-clad indoor VCB is perfectly suited for substation panels, offering secure access and compartmentalization for high-voltage components.
Outdoor Installations
The porcelain-clad outdoor VCB is engineered for outdoor switchyards and grid interconnects, where environmental protection and automatic reclosing are essential.
Summary
Vacuum Circuit Breakers (VCBs) are advanced, reliable, and efficient solutions for modern electrical distribution systems. By employing a vacuum medium for arc suppression, these devices offer outstanding safety, long mechanical life, and low maintenance. Yamuna Power & Infrastructure Ltd. delivers:
- Indoor metal-clad VCBs (12 kV)
- Outdoor porcelain-clad VCBs (up to 36 kV)
These models are characterized by segmented designs, user-friendly operation, and strong environmental resilience. Whether for indoor substation panels or outdoor switchgear, Yamuna Power’s VCBs stand as robust choices meeting diverse electrical infrastructure needs.
