Vacuum Circuit Breaker
Medium-Voltage Vacuum Circuit Breakers for Power Distribution & Switchgear Protection
Medium-voltage vacuum circuit breakers interrupt fault currents and manage load switching within electrical distribution networks. Enclosing contact assemblies inside hermetically sealed ceramic or glass vacuum interrupters, these units extinguish electrical arcs instantly in a high vacuum medium. Built for high-frequency switching operations and severe industrial duty, they protect transformers, generators, and cable feeders against overloads and short circuits without releasing arc flash hazards or requiring dielectric oil maintenance.
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Product Types
Fixed-Type Vacuum Circuit Breakers:
Permanently mounted within switchgear enclosures, bolted directly to internal copper busbars. Utilized where fixed installation space is optimized and circuit breaker withdrawal is unnecessary.
Withdrawable (Drawout) Type Circuit Breakers:
Mounted on a standardized truck chassis with plug-in primary and secondary disconnects. Allows rapid racking in and out for maintenance isolation, minimizing system downtime during routine inspections.
Indoor Side-Mounted VCBs:
Engineered with compact pole configurations tailored for narrow or specialized secondary distribution switchgear cabinets (such as ring main units and compact box substations).
Permanent Magnetic Actuator VCBs:
Replaces conventional spring-operated mechanisms with bi-stable permanent magnets and electronic controllers, reducing mechanical moving parts to under five components for enhanced reliability.
Key Specifications
|
Parameter |
Technical Range / Specification |
|
Rated Voltage |
12kV, 24kV, 40.5kV |
|
Rated Normal Current |
630A, 1250A, 2500A, 3150A |
|
Rated Short-Circuit Breaking Current |
20kA, 25kA, 31.5kA, 40kA, 50kA |
|
Rated Short-Time Withstand Current |
20kA to 50kA (3 seconds duration) |
|
Mechanical Endurance |
10,000 to 30,000 operating cycles |
|
Lightning Impulse Withstand Voltage |
75kV to 185kV (Peak) |
|
Pole Distance |
150mm, 210mm, 275mm, 310mm |
|
Operating Mechanism |
Spring-charged manual/motorized or Permanent Magnetic Actuator |
Technical Features & Performance
Hermetically Sealed Vacuum Interrupters:
Ceramic envelopes fused with high-purity copper-chromium contact materials ensure rapid dielectric recovery following arc extinction, preventing re-ignition across contacts during fault clearing.
Low Resistance Current Paths:
Silver-plated main conductive joints and optimized contact pressure maintain low micro-ohm contact resistance, minimizing Joule heating losses during continuous full-load operation.
Modular Spring Operating Mechanism:
Energy-storing spring mechanism features an anti-pumping device and a mechanical trip-free mechanism, ensuring consistent opening and closing speeds independent of operator control input.
High Short-Circuit Withstand Capability:
Withstands multi-cycle thermal and electrodynamic forces during heavy fault interruptions without structural deformation or loss of vacuum integrity.
Primary & Secondary Switchgear Panels: Overload and short-circuit protection for incoming and outgoing feeders in industrial substations.
Renewable Energy Generation: Grid connection and fault isolation in solar photovoltaic combiner stations and wind turbine collector substations.
Data Center Power Distribution: High-reliability circuit protection safeguarding mission-critical uninterruptible power supply (UPS) distribution loops.
Heavy Industrial Plants: Motor starting control and transformer protection in steel mills, chemical processing facilities, and mining operations.
Product Selection Guide
Verify System Voltage and Current:
Match the breaker's rated voltage and normal continuous current rating to the maximum operating parameters of the electrical network.
Calculate Fault Current Levels:
Ensure the rated short-circuit breaking current (kA) exceeds the prospective short-circuit current calculated at the switchgear installation busbar.
Select Installation Configuration:
Choose withdrawable drawout types for rapid service replacement or fixed types based on switchgear enclosure architecture and space constraints.
Confirm Control Voltage Requirements:
Specify auxiliary control power voltages (e.g., 110VDC, 220VDC, or 230VAC) for closing coils, shunt trip releases, and spring-charging motors.
Vacuum Brazing Furnace Processing: Ceramic-to-metal vacuum interrupter components undergo controlled atmosphere high-temperature brazing to secure absolute hermetic sealing.
High-Vacuum Leak Detection: Every interrupter is tested using mass spectrometer helium leak detectors to identify microscopic seal defects prior to assembly.
Automated Mechanical Endurance Testing: Completed circuit breaker poles undergo routine testing on automated test rigs to measure operating velocity, contact bounce time, simultaneity of phase closure, and trip travel distance.
High-Voltage Dielectric Screening: Power-frequency withstand voltage tests and partial discharge measurements are performed on every production batch to verify internal insulation performance.
Compliance Verification: Manufacturing processes operate under ISO 9001 quality management systems. Product designs comply with IEC 62271-100, GB/T 1984, and IEEE C37.09 standards.
Customization / OEM & ODM
Dimensional Interfacing:
Customized interlocking mechanical pushrods, chassis drawout rail dimensions, and auxiliary switch contact configurations to match existing proprietary switchgear frames.
Control Circuit Integration:
Tailored secondary wiring harnesses, customized plug-in aviation connectors, and specific undervoltage release response thresholds.
Terminal & Busbar Adaptations:
Silver-plated copper terminal riser extensions bent or punched to match specific busbar orientations inside client enclosure layouts.
Our Certificate
FAQ
As one of the most professional vacuum circuit breaker manufacturers and suppliers in China, we also support customized service. We warmly welcome you to buy high quality vacuum circuit breaker made in China here and get pricelist from our factory. For price consultation, contact us.
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