650mm-Width Fixed-Type Vacuum Circuit Breaker

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VS1-12

650mm-Width Fixed-Type Vacuum Circuit Breaker

This product is an indoor high-voltage vacuum circuit breaker designed for 550mm/650mm-width metal-enclosed switchgear. It adopts a solid-insulation structure and advanced epoxy encapsulation technology, organically integrating the vacuum interrupter, main circuit, and insulating supports into a single encapsulated pole, fundamentally improving the product's environmental adaptability.

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Advantages:
The integrated encapsulated-pole structure is compact with reliable insulation; combined with self-convection ventilation technology, it effectively resolves the heat-dissipation difficulty inherent to solid-insulation structures, allowing the product to operate stably over the long term under various environmental conditions, reducing maintenance frequency and extending service life.


Applications:
Suitable for use with metal-enclosed switchgear in 12kV power systems, widely serving substations, distribution rooms, and industrial/mining enterprises for load control and fault protection, meeting the trend toward compact, integrated switchgear.

Item Unit Parameter
Rated Voltage kV 12
Rated Frequency Hz 50
Rated Current A 630-1250 1250-1600
Rated Short-Circuit Breaking Current kA 20 25 31.5
Rated Short-Circuit Making Current kA 50 63 80
Rated Peak Withstand Current kA 50 63 80
4s Rated Short-Circuit Withstand Current kA 20 25 31.5
Rated
Insulation
Level		 Power Frequency Withstand Voltage (Before and After Rated Breaking) kV 42 (Phase to phase, phase to earth) / 48 (Fracture) RMS
Impulse Withstand Voltage (Before and After Rated Breaking) 75 (Phase to phase, phase to earth) / 85 (Fracture) Peak
Rated Operating Sequence Times O - 0.3s - CO - 180s - CO
Mechanical Life Times 20000
Rated Number of Short-Circuit Breaking Operations V 50
Rated Closing Voltage of Operating Mechanism (DC) V AC/DC 110、220
Rated Opening Voltage of Operating Mechanism (DC) mm AC/DC 110、220
Contact Gap (or Contact Opening Distance) mm 9±1
Overtravel (Contact Spring Compression Length) ms 3.5±0.5
Three-Phase Opening and Closing Bounce Time ms ≤ 2
Contact Closing Bounce Time m/s ≤ 2

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About Liyuan

Zhejiang Yingchuang Electric Co., Ltd. was established in March 2018 and is a qualified approved supplier for State Grid and China Southern Power Grid. We specialize in the R&D and manufacturing of high-voltage electrical equipment, including primary-and-secondary integrated pole-mounted circuit breakers, indoor/outdoor vacuum circuit breakers, disconnecting switches, ring main units, and complete switchgear assemblies. Guided by "craftsmanship quality and sincere service," we offer full OEM/ODM customization across our entire product range. In 2024, we were recognized as a Provincial Innovative SME and a National High-Tech Enterprise. 

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