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A High Voltage Vacuum Circuit Breaker is a modern electrical protection device designed to safely interrupt fault currents and control medium voltage power networks. Using advanced vacuum interrupter technology instead of traditional oil or gas-based arc extinction methods, it provides fast fault clearing, excellent insulation performance, and long service life for substations, industrial facilities, renewable energy systems, and utility distribution networks.
Vacuum circuit breakers are widely selected for medium voltage applications because they offer environmentally friendly operation, minimal maintenance requirements, and stable switching performance throughout the product lifecycle. Our HV vacuum circuit breaker solutions are engineered according to IEC 62271-100 standards and designed for reliable operation in demanding electrical environments.
The product portfolio includes: 40.5KV Vacuum Circuit Breaker, Outdoor Vacuum Circuit Breaker, 35KV Substation Circuit Breaker, and Current Transformer Circuit Breaker, providing flexible solutions for different protection and distribution requirements.
Unlike SF6 or oil circuit breakers, vacuum circuit breakers use a sealed vacuum interrupter to extinguish electrical arcs. When contacts separate during fault conditions, the vacuum environment rapidly restores dielectric strength, preventing current flow and protecting downstream electrical equipment.
The breaker adopts horizontally arranged vacuum interrupters installed inside high-strength epoxy resin insulated poles. Each phase is electrically isolated to improve insulation performance and reduce the influence of humidity, pollution, and environmental changes.
The operating mechanism uses a motor-charged spring stored-energy system to provide consistent opening and closing performance. Trip-free operation prevents the breaker from remaining closed under fault conditions, while manual emergency tripping provides additional operator safety.
The vacuum interrupter contacts are manufactured from copper-chromium alloy, offering excellent resistance against arc erosion and reducing contact wear during repeated switching operations. Silver-plated copper conductors minimize resistance losses and improve thermal stability under continuous current loading.
| Parameter | Specification | Standard |
|---|---|---|
| Rated Voltage | 12kV / 24kV / 40.5kV | IEC 62271-100 |
| Rated Current | 630A – 3150A | IEC 62271-100 |
| Rated Short Circuit Breaking Current | 20kA – 31.5kA | IEC 62271-100 |
| Rated Short Circuit Making Current | 50kA – 80kA peak | IEC 62271-100 |
| Power Frequency Withstand Voltage | 28kV / 50kV / 95kV depending on voltage class | IEC 62271-100 |
| Operating Mechanism | Motor charged spring stored-energy mechanism | IEC 62271-100 |
| Mechanical Endurance | 10,000 operations (M2 class) | IEC 62271-100 |
| Electrical Endurance | Up to 50 fault interruption operations (E2 class) | IEC 62271-100 |
| Operating Sequence | O–0.3s–CO–15s–CO | IEC 62271-100 |
| Ambient Temperature | -30°C to +50°C | IEC 62271-1 |
| Altitude | ≤1000m without derating | IEC 62271-1 |
| Humidity | ≤95% RH non-condensing | IEC 60068-2-30 |
High voltage vacuum circuit breakers are widely used in electrical systems requiring reliable switching, low maintenance, and safe fault protection.
As an experienced vacuum circuit breaker manufacturer, we provide customized solutions for utilities, EPC contractors, and electrical equipment distributors worldwide.
Each unit undergoes strict factory testing including power frequency withstand testing, partial discharge measurement, contact resistance inspection, mechanical operation verification, and timing performance testing before shipment.
Our engineering team supports customization including voltage ratings, current capacity, protection accessories, communication interfaces, CT integration, and switchgear compatibility according to project requirements.
Q1: What is a high voltage vacuum circuit breaker?
It is a circuit protection device that uses vacuum interrupters to extinguish electrical arcs and safely disconnect fault currents in medium voltage power systems.
Q2: What are the advantages of vacuum circuit breakers?
Vacuum breakers provide long service life, low maintenance requirements, environmentally friendly operation, and reliable fault interruption without SF6 gas or oil.
Q3: Can vacuum circuit breakers be customized?
Yes. Rated voltage, current capacity, control voltage, protection accessories, monitoring functions, and installation configurations can be customized.
