20KA Withdrawable VCB Circuit Breaker,
VCB Circuit Breaker 12KV,
IEC VCB Circuit Breaker
VS1 Series Vacuum Circuit Breaker 12KV 630-1250A
Breaking current: 20KA
VS1-Series embedded pole. vacuum circuit breakers are applicable to 12kV, three-phase AC 50Hz indoor switchgear and can serve as protection and control units for industrial and mining establishment transformer substation equipment. With modular and independent-frame design for their spring operating mechanisms, VS1-Series circuit breakers can operate with KYN28-12(24) mid-set and fixed switchgear. These circuit breakers are subject to both fixed installation and assembly with the truck as a handcart unit
1EC62271-100 High-voltage switchgear and control-gear-Part 100: Alternating-current circuit-breakers
VS1-Series vacuum circuit breakers adopt modular designs for their secondary control circuit boards. The electric connection of the mechanisms employs high-grade self-fastener plugs, which both facilitates replacement and ensures reliable electrical connection
High-performance oil buffer
High-performance breaking buffer can markedly reduce the overshoot and rebounding amplitudes of the moving contact of a vacuum circuit breaker in breaking thus avoiding the loss of mechanical endurance due to partial over fatigue of vacuum interrupter bellows resulting from moving contact overshoot. As the rebounding amplitudes of the moving contact reduces, No re-ignition and restrike is found during the switching capacitor bank test
Rated insulation level
|1min power frequency withstand voltage(r. m. s)||
48(across the isolating distance)
|Lighting impulse withstand voltage (peak)||
85(across the isolating distance)
|5||Rated short-circuit breaking current||
|6||Rated short-time withstand current||20||25||31.5||40|
|7||Rated short-circuit marking current||50||63||80||100|
|8||Rated peak withstand current||50||63||80||100|
|9||Rated duration of short-circuit||s||4|
|10||Rated operating sequence||O-0.3s-O/C-180s-O/C|
|11||Breaking times of rated short-circuit current||Times||30/20 times(40KA)|
|13||Rated single capacitor bank breaking current||
|14||Rated back-to-back capacitor bank breaking current||400|
|15||Double-earth fault breaking current||27.4|
|16||Allowable maximum contact erosion||
|17||Clearance between open contacts||10±1|
|19||Non-simultaneity of 3-phase opening and closing||
|20||Bounce duration of contact closing||≤2|
|21||Average breaking speed (instant breaking 6mm)||
|22||Average making speed||0.8±0.2|
Resistance of each phase main circuit
|26||Contact breaking bounce amplitude||mm||≤2|
|Rated operating voltage||Rated operating voltage(V)AC/DC||
|Scope of normal operation voltage||Opening:65%-120% rated voltage, in case the voltage is lower than 30% rated voltage, opening operation is not allowed|
|28||Rated voltage of energy storage motor||V||AC110/220,DC110/220|
|29||Energy storage time||S||≤15|
With anti-maloperation locking protection these circuit breakers, working in switchgear cabinets, can realize "five-protection" interlocking functions, avoiding malapert and maximizing the protection of an operator's personal safety.
Only when the circuit breaker and earthing switch are in the disconnected position can the truck of circuit breaker be racked to the service position from the test position
The circuit breaker can be closed only when in the service/test position.
With the circuit breaker closed its truck cannot be racked in or racked out which can be realized only when the circuit breaker is in the disconnected position.
The circuit breaker in a closed position cannot be racked out from the service position to the test position.
The circuit breaker cannot be closed while it is being racked in.
When the circuit breaker is closed, if the closing signal fails to be removed timely, the internal anti-trip control circuit will cut off the closing circuit to prevent multiple reclosing (optional).
If the electric closing lockout is selected, the circuit breaker will be unable to be closed when the secondary circuit fails to provide power or the power provided fails to meet the normal operation of the locking electromagnet(optional).
Contact Person: Antonio