Indoor Lateral Type Vacuum Circuit Breaker--VS1 Series of Vcb

Product description

The VS1 series 4000A indoor lateral - type vacuum circuit breaker is a kind of indoor high - voltage switchgear. It is suitable for three - phase AC 50Hz power systems with a rated voltage of 12kV, used as a protection and control device in power systems such as industrial and mining enterprises, power plants, and substations3. It can be installed in fixed - type switchgear or used alone, and is especially suitable for occasions with frequent operations1. This circuit breaker adopts an integrated design of the operating mechanism and the circuit breaker body. It can be used as a fixed - installation unit or equipped with a special propulsion mechanism to form a hand - cart unit3.

Product parameters

• Rated voltage: 12kV
• Rated frequency: 50Hz
• Rated current: 4000A
• Rated short - circuit breaking current: 31.5kA (other values may also be available according to different models)
• Rated short - circuit making current (peak value): 80kA (corresponding to the rated short - circuit breaking current of 31.5kA)
• Rated peak withstand current: 80kA
• Rated short - time withstand current: 31.5kA, with a rated short - circuit duration of 4s
• Rated insulation level: 1 - minute power - frequency withstand voltage is 42kV (between poles and between poles and ground), 48kV (between breakers); lightning impulse withstand voltage is 75kV (between poles and between poles and ground), 84kV (between breakers)
• Mechanical life: 30,000 times
• Rated short - circuit breaking current breaking times: 50 times
• Contact opening distance: 11±1 mm
• Over - travel distance: 4±0.5 mm
• Average opening speed: 0.9 - 1.2 m/s
• Average closing speed: 0.6 - 0.8 m/s
• Contact closing bounce time: ≤2 ms
• Three - phase opening and closing synchronization: ≤2 ms
• Opening time: ≤0.05 s (under rated operating voltage)
• Closing time: ≤0.1 s
• Main circuit resistance per phase: ≤40 μΩ

Product features

• Excellent arc - extinguishing performance: It uses a vacuum arc - extinguishing chamber, with vacuum as the arc - extinguishing and insulation medium1. The vacuum degree in the arc - extinguishing chamber is extremely high. When the moving and static contacts are opened under the action of the operating mechanism, a vacuum arc will be generated between the contacts1. The special structure of the contacts can also generate an appropriate longitudinal magnetic field in the contact gap, which promotes the vacuum arc to remain in a diffused state and makes the arc evenly distributed on the contact surface for combustion1. This ensures a low arc voltage. At the natural zero - crossing point of the current, the residual ions, electrons, and metal vapor can be recombined or accumulated on the contact surface and the shielding cover in a microsecond - order time, and the dielectric insulation strength of the break - off port of the arc - extinguishing chamber is quickly restored, thereby extinguishing the arc1.
• High reliability: The mechanical life can be as high as 30,000 times, and the full - capacity short - circuit current breaking times can reach 50 times3. It has extremely high operating reliability and a long service life, which can meet the requirements of frequent operations3.
• Compact structure: The overall structure is an integrated installation of the switch body and the operating mechanism, which adopts a composite insulation structure, has a small volume, light weight, no explosion hazard, and a high insulation level3.
• Easy maintenance: The VS1 - 12 vacuum breaker (ordinary type) usually only requires occasional cleaning or lubrication of the operating mechanism1. The VS1 - 12 vacuum breaker (pole - column type) adopts a solid insulation structure - integrated solid - sealed pole column, which realizes maintenance - free1.
• Good adaptability to the environment: It can be used in environments with an ambient temperature range of - 15℃ to + 40℃, an altitude of no more than 3000 meters, and an earthquake intensity of no more than 8 degrees. It is suitable for use in places without fire, explosion hazards, severe pollution, chemical corrosion, and severe vibration2.