| Brand | ROCKWILL |
| Model NO. | Indoor fixed lateral type vacuum circuit break 12kV 17.5kV 24 kV |
| Rated voltage | 24kV |
| Rated frequency | 50/60Hz |
| Series | VD4/R |
| lightning impulse withstand voltage | 75kV/95kV/125kV |
| Rated normal current | 630 / 800 / 1250A |
VD4 series circuit-breakers are devices under vacuum for indoor 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 opera-tor’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)
The following technical parameters fully present the product's electrical parameter configurations, mechanical performance parameters, and dimensional details to facilitate precise system integration and application planning.
| Item | Unit | VD4/R 12 | VD4/R 17 | VD4/R 24 |
|---|---|---|---|---|
| Compliance Standard | - | IEC 6221-1 IEC 62271-100 | ||
| Rated highest voltage for equipment (Ur) | kV | 12 | 17.5 | 24 |
| Rated insulation voltage (Us) | kV | 12 | 17.5 | 24 |
| Rated short-duration power-frequency withstand voltage (1 min, r.m.s.) | kV | 28 | 38 | 50 |
| Rated lightning impulse withstand voltage (peak, 1.2/50μs) | kV | 75 | 95 | 125 |
| Rated frequency (fr) | Hz | 50 / 60 | 50 / 60 | 50 / 60 |
| Rated normal current (Ir, 40℃ ambient temp.) | A | 630 / 800 / 1250 | 630 / 800 / 1250 | 630 / 800 / 1250 |
| Rated short-circuit breaking current (Isc, symmetrical r.m.s.) | kA | 12.5 / 16 / 20 / 25 | 12.5 / 16 / 20 / 25 | 12.5 / 16 / 20 |
| Rated short-time withstand current (Ik, 3s duration, r.m.s.) | kA | 12.5 / 16 / 20 / 25 | 12.5 / 16 / 20 / 25 | 12.5 / 16 / 20 |
| Rated short-circuit making current (Ima, peak value) | kA | 31.5 / 40 / 50 / 63 | 31.5 / 40 / 50 / 63 | 31.5 / 40 / 50 |
| Rated standard auto-reclosing operating sequence (general distribution) | - | O – 0.3 s – CO – 3 min – CO | ||
| Total opening time (trip coil energized to contact separation) | ms | 40 ~ 60 | ||
| Rated arcing time (contact separation to full arc extinction) | ms | 10 ~ 15 | ||
| Total breaking time (Interrupting time = opening time + arcing time) | ms | 50 ~ 75 | ||
| Total closing time (close coil energized to full contact closure) | ms | 30 ~ 60 | ||
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