ZW32-40.5
Outdoor high-voltage vacuum circuit breaker
Outdoor vacuum circuit breaker with solid-insulated embedded poles for 40.5 kV overhead distribution networks. It switches load, overload and short-circuit currents and is maintenance-free over its service life.
Key parameters
- Rated voltage
- 40.5 kV
- Rated current
- 630/1250/1600 A
- Rated short-circuit breaking current
- 20/25/31.5 kA
- Mechanical endurance
- 10,000 operations
- Weight
- 270 kg
General information
The ZW32-40.5 outdoor high-voltage vacuum circuit breaker features an original design with integrated solid-insulated poles (embedded contacts) and a highly reliable operating mechanism. The device is mainly used in medium-voltage overhead distribution networks for making and breaking load currents, overload currents and short-circuit currents.
- Extremely high reliability.
- Completely maintenance-free throughout its service life.
- High mechanical and electrical endurance.
- Small dimensions and weight, easy installation.
Service conditions
- Ambient air temperature: −30 °C … +60 °C.
- Altitude: not more than 3000 m.
- Wind speed: not more than 34 m/s.
- Vibration or ground motion from outside the switchgear and controlgear can be neglected.
- Pollution level: IV.
- Storage temperature: −40 °C … +85 °C.
Main technical parameters of the circuit breaker
| Parameter | Unit | Value |
|---|---|---|
| Rated voltage | kV | 40.5 |
| Rated current | A | 630/1250/1600 |
| Rated frequency | Hz | 50 or 60 |
| Power-frequency withstand voltage, 1 min (wet / dry): phase-to-phase, phase-to-earth / across open gap | kV | 80 95/95 |
| Lightning impulse withstand voltage (peak): phase-to-phase, phase-to-earth / across open gap | kV | 185 |
| Rated short-circuit breaking current | kA | 20/25/31.5 |
| Rated short-circuit making current (peak) | kA | 63/80 |
| Rated peak withstand current | kA | 63/80 |
| Short-time withstand current (4 s) | kA | 25/31.5 |
| Rated operating sequence | O – 0.1 s – CO – 3 s – CO – 6 s – CO – 60 s (reset) | |
| Number of rated short-circuit current breaking operations | times | 30 |
| Mechanical endurance | operations | 10000 |
| Operating mechanism control voltage | V | AC/DC 220 |
| Power-frequency withstand voltage of secondary circuits (1 min) | kV | 2 |
Main mechanical parameters of the circuit breaker
| Parameter | Unit | Value |
|---|---|---|
| Contact stroke (gap) | mm | 16 ± 1 |
| Contact overtravel | mm | 3 ± 0.5 |
| Opening speed | m/s | 1.4–1.8 |
| Closing speed | m/s | 0.4–0.8 |
| Contact bounce time on closing | ms | ≤ 5 |
| Phase spacing (between pole centres) | mm | 560 ± 2 |
| Non-simultaneity of three-phase closing/opening | ms | ≤ 2 |
| Main circuit resistance per phase | µΩ | < 80 |
| Closing time | ms | ≤ 100 |
| Opening time | ms | ≤ 50 |
| Weight | kg | 270 |
Overall and mounting dimensions of the circuit breaker
