12kV 1250A 31.5kA High Voltage Vacuum Circuit Breaker

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The China VD4 series vacuum circuit-breakers are devices for indoor switchgear installation. Please contact ROCKWILL for special installation requirements. VD4-R series medium voltage vacuum circuit breakers with lateral operating mechanism for indoor installation feature the separate pole construction technique. Each pole houses a vacuum interrupter which is encased in the resin when the cylinder is moulded thanks to a special manufacturing process. This construction method protects the vacuum interrupter from shock, pollution and condensation.
The operating mechanism is the trip-free stored energy type with independent opening and closing regardless of the operator's action. The operating mechanism is widely used in all VD4-R series circuit-breakers with frontal control.
The circuit-breaker can be remote controlled when fitted with dedicated electrical accessories (gearmotor, opening and closing release).
The operating mechanism, the three poles and the current sensors (if provided) are installed on a metal frame without wheels. The construction is particularly compact, sturdy and of limited weight.
VD4-R series circuit-breakers with lateral operating mechanisms are life-long sealed pressure devices.(Standards IEC 62271-100)

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Vacuum circuit-breaker   **4/R 12 **4/R 17 **4/R 24
Standards   *     *     *    
Rated voltage Ur(kV) 12     17.5     24    
Rated insulation voltage Us(kV) 12     17.5     24    
Withstand voltage at 50Hz Ud(kV) 28     38     50    
Impulse withstand voltage Up(kV) 75     95     125    
Rated frequency fr(Hz) 50-60     50-60     50-60    
Rated thermal current Ir(A) 630 800 1250 630 800 1250 630 800 1250
Rated duty breaking capacity
(symmetrical rated short-circuit current)
Isc(kA) 12.5 / / 12.5 / / 12.5 / /
16 16 16 16 16 16 16 16 16
20 20 20 20 20 20 20 20 20
25 25 25 25 25 25 / / /
Short-time withstand current(3s) Ik(kA) 12.5 / / 12.5 / / 12.5 / /
16 16 16 16 16 16 16 16 16
20 20 20 20 20 20 20 20 20
25 25 25 25 25 25 / / /
Making capacity Ip(kA) 31.5 / / 31.5 / / 31.5 / /
40 40 40 40 40 40 40 40 40
50 50 50 50 50 50 50 50 50
63 63 63 63 63 63      
                 
Making capacity   * * *
Opening time ms 40...60 40...60 40...60
Arcing time ms 10...15 10...15 10...15
Total break-time ms 50...75 50...75 50...75
Closing time ms 30...60 30...60 30...60
Code Available versions
Closing pushbutton **4circuit-breakers with lateral operating mechanism are available in
the following versions:
Open/closed indicator      
Discharged Center-distance P=()mm Fixed Removable
Operation counter 210 210
Manually charging handle 230 230
Opening pushbutton 250 250
Protection relay 275 275
Delivery terminal box 300 300
Current transformer 310 310
Polo      

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