ZW32-40.5 (35kV) Single Pole Outdoor Vacuum Circuit Breaker
ZW32-40.5 Single Pole Outdoor Vacuum Circuit Breaker is a 40.5kV pole-mounted vacuum circuit breaker designed for medium-voltage overhead distribution networks. It features a compact single-pole structure, reliable vacuum interruption technology, and intelligent protection functions to provide safe switching, fault isolation, and automatic reclosing for modern power systems. With excellent weather resistance and low maintenance requirements, it is widely used in utility distribution, renewable energy projects, industrial networks, and smart grid applications.
Get a QuoteOverview
The ZW32-40.5 Single Pole Outdoor Vacuum Circuit Breaker is designed for 40.5kV medium-voltage overhead distribution systems, providing reliable switching and protection performance in outdoor applications. With a compact single-pole structure and permanent magnet operating mechanism, it supports load switching, overload protection, short-circuit interruption, and automatic reclosing functions for modern power networks.
The independent pole design allows multiple units to be combined into a three-phase automatic recloser system, making it an ideal solution for utility substations, rural power distribution, renewable energy facilities, industrial networks, and smart grid projects.
Equipped with a sealed vacuum interrupter, integrated silicone rubber insulation, corrosion-resistant enclosure, and high-conductivity copper contacts, the breaker ensures stable operation, reduced maintenance requirements, and extended service life in challenging outdoor environments.
Operating Conditions
1. Ambient Temperature: -30°C to +60°C;
2. Storage Temperature: -40°C to +85°C;
3. Altitude: ≤2000m (Higher altitude available);
4. Wind Speed: ≤34m/s
5. Pollution Level: Class IV;
6. Installation: Outdoor Pole Mounted
Features
Permanent Magnetic Operating Mechanism
- Maintenance-free permanent magnetic actuator design
- Stable opening and closing performance
- Mechanical life up to 20,000 operations
- Low operating energy consumption
- Three-phase synchronization time ≤3 ms
One-Piece Silicone Rubber Insulation
The breaker adopts an integral molded silicone rubber insulation structure, providing excellent sealing performance and environmental resistance. The insulation system offers reliable protection against moisture, UV radiation, salt fog, and severe pollution conditions. It is suitable for outdoor applications with an operating temperature range from -30°C to +60°C and storage conditions from -40°C to +85°C.
Vacuum Interruption Technology
- High-performance vacuum interrupter for efficient arc extinction
- SF6-free design with environmentally friendly operation
- Fast fault current interruption capability
- High dielectric recovery strength
- Long electrical endurance and reliable switching performance
Stainless Steel Sealed Tank
The stainless steel sealed enclosure is designed for long-term outdoor operation in harsh environments. Its corrosion-resistant structure and fully enclosed design effectively protect internal components from rain, dust, snow, and humidity. The lightweight construction makes it suitable for pole-mounted installation in coastal, mining, desert, and other demanding areas.
High Conductivity Copper Contacts
- Forged high-purity copper contacts
- Contact resistance below 120 μΩ
- Low temperature rise during continuous operation
- Excellent electrical conductivity
- Extended electrical contact service life
Available Configurations
| Model | Configuration |
| Manual Type | Manual operating mechanism |
| Motorized Type | Permanent magnetic actuator |
| Motorized + Controller | Automatic reclosing controller |
| Motorized + Controller + PT | Voltage sensing and auxiliary power |
| Motorized + Controller + PT + CT | Complete protection, metering and SCADA solution |
Technical Data
| Item | Unit | Parameter | |
| Rated Voltage | kV | 40.5 | |
| System Voltage | 35 | ||
| Rated Current | A | 630 / 1250 | |
| Rated Frequency | Hz | 50/60 | |
| Rated Short Circuit Breaking Current | kA | 20 / 25 / 31.5 | |
| Rated Short Circuit Making Current(Peak) | 80 | ||
| Short-Time Withstand Current (4s) | 31.5 | ||
| Power Frequency Withstand Voltage | Wet | kV | 80 |
| Dry | 95 | ||
| Lightning Impulse Withstand Voltage | 185 | ||
| Rated Short-Circuit Breaking Operations | Times | 30 | |
| Mechanical life | 20000 | ||
| Control Voltage | V | DC220 | |
| Weight | kg | Approx. 100kg per pole | |
| Pole Spacing | mm | 560±2 | |
Overall and mounting dimensions(mm)
Intelligent Protection and Control Functions
With an intelligent controller installed, the ZW32-40.5 supports advanced protection, monitoring, and remote control functions for modern distribution automation systems.
- Overcurrent protection
- Earth fault protection
- Three-stage protection settings
- Automatic reclosing function (0–3 shots)
- Voltage and current monitoring
- Remote opening and closing control
- Fault event recording
- SCADA communication capability
- Distribution automation integration
Applications
The ZW32-40.5 single pole outdoor vacuum circuit breaker is designed for a wide range of medium-voltage distribution applications. Its reliable switching performance and outdoor adaptability make it suitable for utility networks, renewable energy systems, and industrial power distribution.
Typical applications include:
- Utility distribution networks
- Rural electrification projects
- Pole-mounted substations
- Solar power generation systems
- Wind power plants
- Hydropower facilities
- Mining power distribution systems
- Industrial electrical networks
- Smart grid applications
Multiple independent poles can be assembled into a complete three-phase automatic recloser system, providing a flexible solution for overseas utility distribution projects.
Standard Configuration
The standard configuration includes:
- Vacuum interrupter
- Silicone rubber insulators
- Stainless steel sealed tank
- Copper main contacts
- Permanent magnetic operating mechanism
Optional Accessories
To meet different project requirements, the breaker can be equipped with various optional accessories:
- Automatic reclosing controller
- 20Ah backup battery
- Voltage transformer (PT)
- Current transformer (CT)
- 32-pin communication connector
- Anti-corrosion coating
- Three-phase mounting frame
- SCADA communication module
- Wireless remote monitoring system
Compliance Standards
The ZW32-40.5 can be manufactured according to international standards to ensure reliable performance and compatibility with different power systems.
- IEC 62271-100
- IEC 62271-1
- IEC 60044 (CT/PT options)
- IEC 60529 (IP protection rating)
- IEEE / ANSI standards (optional)
- Applicable for both 50Hz and 60Hz power systems
