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VS1-12/4000 Trolley Type Vacuum Circuit Breaker Insulation Cylinder High Current 4000A

The VS1-12/4000-275 vacuum circuit breaker is a high-performance medium-voltage switchgear component, engineered for demanding industrial and distribution applications requiring reliability, efficiency, and superior safety. This model is designed with a draw-out, making installation and maintenance easy and convenient, and it fits a variety of switchgear configurations.

Key Features of VS1-12/4000 VCB

  • Rated Voltage: 12kV
  • Rated Current: 4000A
  • Pole Center Distance: 275mm
  • Breaking Capacity: 40kA
  • Operating Mechanism: VS1 spring-operated mechanism
Electrical ProductsElectrical Products

Highlights of VS1-12/4000 Trolley Type Vacuum Circuit Breaker

  • Superior Breaking Performance: Employs advanced vacuum interrupter technology to achieve safe, reliable arc extinction, ensuring secure electrical circuit protection even in challenging conditions.
  • Ease of Maintenance: The draw-out structure allows quick and straightforward access for maintenance or replacement, reducing downtime and associated costs.
  • Smooth and Stable Operation: The VS1 spring-operated mechanism provides precise, responsive switching performance, designed to meet the highest industry standards.
  • Enhanced Insulation Properties: The use of an insulated cylinder design improves overall dielectric strength, providing robust isolation and reducing the risk of breakdowns due to environmental factors.
  • High Adaptability: Versatile for a wide range of industrial applications, including power distribution, manufacturing facilities, mining operations, and large infrastructure projects where high current and strong short-circuit breaking capacity are essential.

Environmental Conditions for Using VS1-12/4000 VCB

  • Ambient temperature: -10℃–+40℃
  • Ambient humidity: the average humidity of a day should be no more than 95%; the average humidity of a month should be no more than 90%;
  • Earthquake intensity: not exceed 8 degrees
  • Saturated vapor pressure: average pressure of a day should be no more than2.2kPa, the average pressure of a month should be no more than 1.8kPa;
  • The height above sea level: less than 1000m;(not including special requirements)
  • It should be installed in the places without fire, explosion, serious filth, chemical corrosion and violent vibration.

Technical Parameters of VS1-12/4000 VCB

Item
Unit
Data
Rated voltage
kV
12
Rated frequency
Hz
50
Rated insulation level
1 min power frequency withstand voltage
kV
42
Rated lightning impulse withstand voltage
kV
75
Rated current
A
630/1000/1250/1600/2000/2500/3150/4000
Rated short circuit breaking current
Rated short-time withstand current (virtual value)
kA
 
20/25/31.5/40/50
 Rated short circuit making current 
Dynamic stability rated current
kA
 
50/63/80/100/125
 Rated short-circuit breaking current breaking time
Times
(above 40kA)
 Rated short-circuit duration
S
4
Rated operation sequence
O-0. 3s-CO-180s-CO,
O-180s-CO-180s-CO(above 40kA)
Mechanical life
Times
30000
Rated breaking current of single capacitor bank
A
630
Rated breaking current of back to back capacitor bank
A
400
Maximum D.C componen
50%

Dimensions of VS1-12/4000 VCB

VS1-12-4000-275 VCB drawing

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