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ZW7(ZW37A/ZW17)-40.5
Fenarro
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This outdoor vacuum circuit breaker adopts vacuum arc-extinguishing technology, providing strong breaking capability, excellent insulation performance, and a long service life. Its compact structure and low-maintenance design make it suitable for frequent operation in substations, industrial plants, and rural power grids.
Equipped with built-in current transformers (CTs) and an anti-condensation controller, the breaker ensures reliable operation under varying temperature and humidity conditions.
40.5kV three-phase AC systems
Substations for protection and control
Industrial and mining enterprises requiring reliable power switching
Urban and rural power distribution networks
Overhead and pole-mounted installations
Vacuum Arc-Extinguishing Technology – Strong breaking capacity and long electrical life.
Durable Mechanical Performance – Mechanical life up to 10,000 operations.
Low Maintenance – Simple structure, maintenance-free design, and extended overhaul cycle.
Excellent Insulation & Pollution Resistance – Ensures stable operation in harsh environments.
Flexible Operating Mechanisms – Compatible with spring or electromagnetic actuators for reliable switching.
Safe Operation – No risk of fire or explosion.
Built-in Current Transformers – Accuracy up to 0.2 class, supporting precise measurement and protection.
Anti-Condensation Controller – Maintains reliable performance under varying humidity and temperature.
| Serial No. | Item | Unit | Numerical Value | ||
|---|---|---|---|---|---|
| 1 | Rated Voltage | kV | 40.5 | ||
| 2 | Rated Insulation Level | Power Frequency Withstand Voltage | Dry - type | kV | 95 |
| Wet - type | kV | 80 | |||
| Lightning Impulse Withstand Voltage (Peak Value) | kV | 185 | |||
| 3 | Rated Current | A | 1250, 1600, 2000 | ||
| 4 | Rated Short - circuit Breaking Current | kA | 20, 25, 31.5 | ||
| 5 | Rated Operating Sequence | - | Open - 0.3s Close & Separate - 180s Close & Open | ||
| 6 | Number of Rated Short - circuit Current Breaking Operations | times | 12 | ||
| 7 | Rated Short - circuit Making Current (Peak Value) | kA | 50, 63, 80 | ||
| 8 | Rated Peak Withstand Current | kA | 50, 63, 80 | ||
| 9 | Rated Short - time Withstand Current | kA | 20, 25, 31.5 | ||
| 10 | Rated Short - circuit Duration | s | 4 | ||
| 11 | Average Opening Speed | m/s | 1.5±0.2 | ||
| 12 | Average Closing Speed | m/s | 0.7±0.2 | ||
| 13 | Contact Closing Rebound Time | s | ≤2 | ||
| 14 | Asynchronism of Three - phase Closing (Opening) | s | ≤2 | ||
| 15 | Closing Time | s | ≤150 | ||
| 16 | Opening Time | s | ≤60 | ||
| 17 | Mechanical Life | times | 10000 | ||
| 18 | Rated Operating Voltage and Rated Voltage of Auxiliary Circuit | V | DC/AC220, 110, 24 | ||
| 19 | DC Loop Resistance of Each Phase (Excluding Transformer) | μΩ | ≤100 | ||
| 20 | Allowable Wear Thickness of Moving and Static Contacts | mm | 3 | ||
| 21 | Weight | kg | 800 | ||
Q1: What is the rated voltage of the ZW7(ZW37A/ZW17)-40.5 breaker?
A1: It is designed for 40.5kV three-phase AC systems.
Q2: What type of arc extinguishing method is used?
A2: The breaker uses vacuum arc-extinguishing technology, ensuring strong breaking capability.
Q3: How long is the mechanical life of the breaker?
A3: The mechanical life is up to 10,000 operations, suitable for frequent switching.
Q4: Does the breaker require frequent maintenance?
A4: No, it has a simple and maintenance-free design with long overhaul intervals.
Q5: Can it operate in harsh outdoor environments?
A5: Yes, it features excellent insulation, strong anti-pollution ability, and an anti-condensation controller, ensuring reliable operation in various climates.
