Product Overview
The ZN23-40.5 vacuum circuit breaker is an indoor high-voltage apparatus rated for 40.5kV and three-phase AC 50Hz. It is suitable for control and protection in industrial and mining enterprises, substations, and power transmission systems.
Particularly engineered for high-frequency operation industries such as metallurgy and electric arc steelmaking, it provides highly reliable switching under harsh electrical conditions. The product fully complies with the GB1984-89 standard.
Engineered for high-frequency switching in metallurgy and electric arc steelmaking.
Technical Specifications
|
No. |
Item |
Unit |
Parameter |
|
1 |
Rated Voltage |
KV |
40.5 |
|
2 |
Rated Lightning Impulse Withstand Voltage (Peak) |
KV |
185 |
|
3 |
Power Frequency Withstand Voltage (1 min) |
KV |
95 |
|
4 |
Rated Frequency |
HZ |
50 |
|
5 |
Rated Current |
A |
1250,1600,2000 |
|
6 |
Rated Short-circuit Breaking Current |
KA |
25,31.5 |
|
7 |
Rated Short-time Withstand Current |
KA |
|
|
8 |
Rated Peak Withstand Current |
KA |
63,80 |
|
9 |
Rated Short-circuit Duration |
S |
4 |
|
10 |
Rated Short-circuit Breaking Time |
ms |
≈90 |
|
11 |
Rated Short-circuit Making Current |
KA |
63,80 |
|
12 |
Rated Operating Sequence |
O - 0.3s - CO - 180s - CO |
|
|
13 |
Closing Time |
ms |
50~85 |
|
14 |
Opening Time |
ms |
40~85 |
|
15 |
Rated Breaking Operations at Rated Short-circuit Breaking Current |
times |
20 |
|
16 |
Mechanical Life |
times |
10000 |
Internal vacuum interrupter and spring operating mechanism structure.
Type Designation and Its Meaning
ZN: Indoor Vacuum Circuit Breaker
23: Design Serial Number
40.5: Rated Voltage (kV)
C: Truck Type (Withdrawable)
2000: Rated Current (A)
31.5: Rated Short-Circuit Breaking Current (kA)
Core Advantages
- Built for Heavy Industry: Specifically designed for high-frequency switching in metallurgy and electric arc furnaces. Mechanical life of 10,000 operations and 20 rated short-circuit breaking operations ensure long-term reliability.
- Fast & Reliable Breaking: Opening time 40-85ms, closing time 50-85ms. Rated short-circuit breaking current up to 31.5kA and making current up to 80kA (peak), ensuring rapid fault clearing.
- Easy Maintenance (Drawout Design): Truck-mounted (withdrawable) configuration compatible with standard switchgear. Allows for quick and safe maintenance, minimizing downtime.
- Robust Environmental Adaptability: Designed for altitudes up to 1000m (or 3000m at 7.2kV). Operates reliably in ambient temperatures up to +40°C, and is highly resistant to condensation, pollution, and seismic intensity up to degree 8.
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