How an Indoor Vacuum Circuit Breaker Works
The indoor VCB operates by opening its contacts within a sealed vacuum interrupter whenever a fault occurs. When the contacts separate, an electrical arc forms briefly but quickly extinguishes due to the vacuum’s absence of gas molecules. This fast arc extinction prevents damage to the electrical system and ensures smooth restoration of normal operation.
This mechanism offers high interrupting capability, long service life, and minimal maintenance, making indoor VCBs ideal for demanding environments.
Technical and Operational Benefits
Compact Construction
Indoor VCBs are designed for installation in switchgear cubicles, allowing optimal use of space in substations or control rooms.High Mechanical Endurance
Capable of thousands of operating cycles without significant wear, ensuring dependable long-term performance.Fast Fault Interruption
The vacuum interrupter’s fast response minimizes damage during short-circuit or overload events.Low Maintenance and Operating Cost
With sealed interrupters and no gas leaks, maintenance is minimal — leading to lower downtime and operational expenses.Eco-Friendly Solution
No SF₆ or oil is used, making it a sustainable alternative that supports global environmental goals.
Common Applications of Indoor VCBs
Indoor vacuum circuit breakers are used in a wide range of sectors:
Power Utilities – Protect feeders and transformers in distribution networks.
Industrial Plants – Safeguard heavy equipment and motor control systems.
Commercial Buildings – Maintain uninterrupted power for essential services.
Renewable Energy Systems – Provide safe switching for solar and wind energy integration.
Whether it’s a substation, factory, or data center, the indoor VCB delivers exceptional protection and operational stability.
Indoor VCBs vs. Gas and Oil Circuit Breakers
| Parameter | Indoor VCB | SF₆ Breaker | Oil Breaker |
|---|---|---|---|
| Medium | Vacuum | SF₆ Gas | Oil |
| Maintenance Needs | Low | Moderate | High |
| Safety Level | Very High | High | Medium |
| Environmental Impact | Zero Emission | Greenhouse Gas | Pollution Risk |
| Typical Use | Indoor Switchgear | Outdoor Substations | Older Systems |
This comparison clearly shows why indoor vacuum circuit breakers are becoming the dominant solution in modern power systems — they combine safety, efficiency, and environmental compliance.
The Role of Degatech Electric
At Degatech Electric, we are dedicated to delivering high-quality indoor vacuum circuit breakers for medium-voltage power networks. Our VCBs are engineered for maximum reliability, fast fault clearance, and long-term operation with minimal maintenance.
With a commitment to eco-friendly innovation, Degatech Electric supports the global movement toward sustainable and efficient energy systems.
Discover more about our products here:
? Degatech Electric – Indoor Vacuum Circuit Breaker Products
