Vacuum Circuit Breakers
Reliable medium voltage vacuum circuit breakers for outdoor pole-mounted and indoor switchgear applications. Proven vacuum arc extinguishing technology with superior breaking capacity.
ZW32-12 Outdoor Vacuum Circuit Breaker
The ZW32-12 is a pole-mounted outdoor vacuum circuit breaker rated at 12kV, widely used in rural and urban power distribution networks. Features a compact spring-operated mechanism for reliable switching operations.
ZW32-24 Outdoor Vacuum Circuit Breaker (24kV)
The ZW32-24 is a 24kV outdoor vacuum circuit breaker with spring operating mechanism, rated at 630A with short-circuit breaking capacity up to 25kA. Widely used in hydropower stations, industrial substations, renewable energy grid connections, and rural/urban distribution networks. Control voltage options include 110VDC, 220VDC, and 220VAC. Fully compliant with IEC 62271-100.
SPV-12 Outdoor Vacuum Circuit Breaker (12kV)
The SPV-12 is a 12kV oil-free, SF6-free, maintenance-free outdoor vacuum circuit breaker pioneered by NAIJI Electric. Features three-phase pillar-type structure with longitudinal magnetic field vacuum arc extinguishing technology and solid epoxy resin insulation (APG vacuum casting). The spiral groove contacts produce a rotating magnetic field, accelerating ionized particle diffusion and reducing arc energy. Special alloy shielding rapidly absorbs arc energy for low heat, short extinguishing time, and long service life. Imported outdoor-grade epoxy resin with integral vacuum casting — proven by 20+ years of outdoor operation with no surface carbonization. Every unit X-ray inspected. Weighs only 2/3 of comparable products.
SPV-24 Outdoor Vacuum Circuit Breaker (24kV)
The SPV-24 is a 24kV oil-free, SF6-free, maintenance-free outdoor vacuum circuit breaker by NAIJI Electric. Extended voltage class with enhanced insulation levels (125/145kV lightning impulse withstand). Same proven longitudinal magnetic field rotating arc technology and solid epoxy resin insulation (APG vacuum casting) as the SPV-12. Every unit X-ray inspected. Weighs only 2/3 of comparable products. Ideal for 20kV distribution systems and higher voltage applications.
ZW20-12 Outdoor Vacuum Circuit Breaker
The ZW20-12 is a three-phase common-box type outdoor vacuum circuit breaker with longitudinal magnetic field arc extinguishing and SF6 gas insulation. Maintenance-free design with stable breaking performance, no combustion or explosion risk.
Vacuum Circuit Breakers from NAIJI Electric
High-performance 12-24kV outdoor and indoor vacuum circuit breakers designed for power distribution networks. Spring-operated mechanism with 10,000+ mechanical operations life cycle.
As a professional manufacturer with 25+ years of experience, NAIJI Electric produces high-quality products that meet international standards including IEC 62271. Our products are exported to more than 20 countries across Southeast Asia, Middle East, Africa, Latin America, and CIS regions.
All products undergo rigorous factory testing including power frequency withstand, lightning impulse withstand, and mechanical endurance tests before shipment. We offer both standard models and custom configurations to meet your project-specific requirements.
Related Technical Articles
In-depth guides from NAIJI Electric engineers to help you select and specify vacuum circuit breakers.
Vacuum Circuit Breaker vs SF6: 10-Dimension Comparison
VCB vs SF6 circuit breaker: voltage, breaking capacity, mechanical life (30,000 vs 10,000 ops), 25-year lifecycle cost, EU F-Gas timeline. 10-dimension comparison from MV circuit breaker manufacturer →
4.16kV vs 12kV vs 40.5kV VCB: Voltage Selection | NAIJI
Compare 4.16kV, 12kV & 40.5kV vacuum circuit breakers: breaking capacity, BIL ratings, cost & IEC vs ANSI selection table. Factory-direct VCB manufacturer. ISO certified. Get quote →
Outdoor vs Indoor VCB Cost: Installation & TCO
Complete engineering comparison of outdoor vs indoor vacuum circuit breakers covering IP ratings (IP54 vs IP41), installation cost, maintenance, cooling, operating temperature, mechanical life, and typical applications. Manufacturer data from NAIJI Electric.
Vacuum Interrupter: How It Works, CuCr Contacts & Testing
How a vacuum interrupter works: CuCr contact materials, arc-quenching physics, X-ray leak testing & 5 common failure modes. Engineer guide from 25+ year MV manufacturer. Free spec sheet →
Frequently Asked Questions
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