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20KA Alternating Withdrawable VCB Circuit Breaker 12KV

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20KA Alternating Withdrawable VCB Circuit Breaker 12KV

20KA Alternating Withdrawable VCB Circuit Breaker 12KV
20KA Alternating Withdrawable VCB Circuit Breaker 12KV

Large Image :  20KA Alternating Withdrawable VCB Circuit Breaker 12KV

Product Details:
Place of Origin: China
Brand Name: KNKONG
Certification: CB,ISO,IEC
Model Number: VS1-12
Payment & Shipping Terms:
Minimum Order Quantity: 1
Packaging Details: Standard export packaging
Delivery Time: 15 working days
Payment Terms: L/C, T/T, Western Union
Supply Ability: 1000 Unit per month

20KA Alternating Withdrawable VCB Circuit Breaker 12KV

Voltage: 12KV Current: 630A 1250A
Breaking Current: 20KA Type: Withdrawable
Original: China Manufactory: KNKONG
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20KA Withdrawable VCB Circuit Breaker


VCB Circuit Breaker 12KV


IEC VCB Circuit Breaker

VS1 Series Vacuum Circuit Breaker 12KV 630-1250A

Voltage: 12KV

Current: 630-1250A

Breaking current: 20KA

Type: withdrawable



Product overview

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


Applicable standards

1EC62271-100 High-voltage switchgear and control-gear-Part 100: Alternating-current circuit-breakers


Secondary circuit

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


Technical Parameters

No. Item Unit Parameter
1 Rated voltage KV 12
2 Rated frequency Hz 50/60


Rated insulation level

1min power frequency withstand voltage(r. m. s)



42(phase-to-phase, phase-to-earth)

48(across the isolating distance)

Lighting impulse withstand voltage (peak)

75(phase-to-phase, phase-to-earth)

85(across the isolating distance)






Rated current




630 630 1250 1600
1250 1250 1600 2000
    2000 2500
    2500 3150
5 Rated short-circuit breaking current



20 25 31.5 40
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)
12 Mechanical endurance Ops 20000
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
18 Over stroke 3.5±0.5
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
23 Making time



24 Breaking time ≤50





Resistance of each phase main circuit


μ Ω

630A ≤50
1250A ≤45
1600A~2000A ≤35
≥2500A ≤25
26 Contact breaking bounce amplitude mm ≤2



Rated operating voltage Rated operating voltage(V)AC/DC



24* 110 220
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



Operation safety

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).


20KA Alternating Withdrawable VCB Circuit Breaker 12KV 0

Contact Details
Knkong Electric Co.,Ltd

Contact Person: Antonio

Tel: +8613607680651

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