1.overview
The ZW20-12 Three-Phase Combined Box Type Pole-Mounted Circuit Breaker system utilizes vacuum arc extinguishing technology and SF6 gas for external insulation, providing stable and reliable interruption performance. The product features a fully enclosed structure with excellent sealing capabilities, strong moisture resistance, and anti-condensation properties, making it suitable for use in hot and humid areas. It is primarily used for interrupting and closing load currents, overload currents, and short-circuit currents in power systems. This equipment is suitable for protection and control in substation and industrial distribution systems, and it is particularly well-suited for rural power grids and locations with frequent operations.
2.Technical Specifications
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Parameter Category |
Parameter Index |
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Rated Voltage |
12 kV |
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Rated Insulation Level |
1-minute Rated Power Frequency Withstand Voltage |
Wet test |
Phase-to-phase and phase-to-ground: 30 kV; Breaker contacts: 34 kV |
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Dry test |
Phase-to-phase and phase-to-ground: 42 kV; Breaker contacts: 48 kV |
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Rated Lightning Impulse Withstand Voltage (Peak Value) |
Phase-to-phase and phase-to-ground |
75 kV |
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Breaker |
85 kV |
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Rated Current |
630 A |
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Rated Short-Circuit Breaking Current |
20 kA、25 kA |
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Rated Short-Circuit Closing Current (Peak Value) |
50 kA、63 kA |
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Rated Dynamic Stability Current (Peak Value) |
50 kA、63 kA |
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Rated Thermal Stability Current (RMS Value) |
20 kA、25 kA |
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Rated Short-Circuit Breaking Operations |
30times |
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Rated Thermal Stability Duration |
4s |
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Rated Operating Sequence |
O－0.3s－CO－180s－CO |
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Mechanical Life |
10000times |
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Permissible Contact Wear Thickness |
3 mm |
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Weight |
177 kg |
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3.operating environment
1. Ambient Temperature: Minimum Temperature: -50°C, Maximum Temperature: +70°C, Maximum Daily Temperature Difference: 25°C
2. Ambient Humidity: Daily Average Relative Humidity: ≤ 95% , Monthly Average Relative Humidity: ≤ 90%
3. Altitude: ≤ 2000 m (customization required for altitudes above 2000 m)
4. Pollution Level: Level IV
5.Operating Environment: Outdoor, areas without flammable or explosive hazards, chemical corrosion and frequent severe vibrations