Fixed-Type Vacuum Circuit Breaker

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VS1-12

Fixed-Type Vacuum Circuit Breaker

This product is an indoor high-voltage AC vacuum circuit breaker used in 12kV power systems, serving as a protection and control unit for grid equipment and industrial/mining power installations. Owing to the special interrupting advantages of vacuum technology, it is especially suited to applications requiring frequent operation at rated working current or repeated interruption of short-circuit current.

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Features:
The operating mechanism and breaker body adopt an integrated design, giving a compact and reliably assembled structure; it can be used independently as a fixed installation unit, or fitted with a dedicated propulsion mechanism to form a withdrawable unit, flexibly meeting the requirements of different switchgear.


Applications:
Widely suitable for substations, industrial/mining enterprises, and various distribution systems, undertaking the switching control of load current, overload current, and short-circuit current, serving as an important switching device for the safe and stable operation of the grid and electrical equipment.

Item Unit Parameter
Rated Voltage kV 12
Rated Short-Time Power Frequency Withstand Voltage (1min) kV 42
Rated Lightning Impulse Withstand Voltage (Peak) kV 75
Rated Frequency Hz 50
Rated Current A 630
1250		 630  1250  1600
2000  2500  3150		 1250  1600  2000
2500  3150  4000
Rated Short-Circuit Breaking Current kA 20/25 31.5 40
Rated Short-Time Withstand Current kA 20/25 31.5 40
Rated Short-Circuit Duration s 4
Rated Peak Withstand Current kA 50/63 80 100
Rated Short-Circuit Making Current kA 50/63 80 100
Auxiliary Circuit Power Frequency Withstand Voltage (1min) V 2000
Rated Single / Back-to-Back Capacitor Bank Breaking Current A 630/400 (800/400 for 40kA)
Rated Capacitor Bank Making Inrush Current kA 12.5 (frequency not greater than 100Hz)
Opening Time (Rated Voltage) ms ≤ 50
Closing Time (Rated Voltage) ms ≤ 60
Mechanical Life Times 20000
Rated Current Breaking Operations (Electrical Life) Times 20000
Rated Short-Circuit Breaking Operations Times 50 (40kA ≤ 30)

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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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