ZW7-40.5 Outdoor Vacuum Circuit Breaker
Minrong Electric
Product Overview
The ZW7-40.5 Outdoor Vacuum Circuit Breaker is a 40.5kV outdoor high-voltage vacuum circuit breaker designed for switching and protection in outdoor power distribution systems and substations. It is available with rated current configurations of 1250A, 1600A and 2000A and is suitable for three-phase AC power systems requiring reliable interruption of load, overload and short-circuit currents.
The breaker uses vacuum interruption technology together with a spring operating mechanism and outdoor porcelain-insulated structure. Its long mechanical life, high insulation withstand capability and robust outdoor construction make it suitable for utility networks, substations and industrial power distribution applications.
The ZW7-40.5 supports AC/DC 220V and DC 110V operating and auxiliary circuit configurations, while the standard operating sequence of O-0.3s-CO-180s-CO allows repeated opening and closing operations under specified service conditions.
Technical Specifications
| Parameter | Unit | Specification |
|---|---|---|
| Model | — | ZW7-40.5 |
| Rated Voltage | kV | 40.5 |
| Rated Current | A | 1250 / 1600 / 2000 |
| Rated Frequency | Hz | 50 |
| Rated Operating Voltage and Auxiliary Voltage | V | AC/DC 220, DC 110 |
| Rated Lightning Impulse Withstand Voltage | kV peak | 185 |
| Rated Power Frequency Withstand Voltage | kV / 1 min | 95 Dry / 80 Wet |
| Mechanical Life | Operations | 10,000 |
| Rated Operating Sequence | — | O-0.3s-CO-180s-CO |
| Installation | — | Outdoor |
| Operating Mechanism | — | Spring Operating Mechanism |
* Final electrical and mechanical configurations should be confirmed according to the selected product version and project requirements.
ApplicationsSubstations
Used for outdoor circuit switching and protection in 40.5kV substation feeder and distribution systems.
Power Distribution
Suitable for outdoor power distribution networks requiring dependable high-voltage vacuum interruption.
Industrial Power
Designed for industrial electrical systems where reliable switching and protection are required at 40.5kV.
Utility Networks
Applicable to utility-owned outdoor distribution systems and other high-voltage switching installations.
Key Features0140.5kV High-Voltage Design
Designed for 40.5kV outdoor power systems with high insulation capability for demanding distribution applications.
02Multiple Current Ratings
Available in 1250A, 1600A and 2000A configurations to match different feeder and load requirements.
03Vacuum Interruption
Vacuum interrupters provide reliable arc extinction and current interruption without oil-based arc-extinguishing media.
04Outdoor Insulation Structure
The porcelain-column outdoor structure provides mechanical support and electrical insulation for exposed installation environments.
05Long Mechanical Life
Designed for up to 10,000 mechanical operations, supporting long-term service with reduced maintenance requirements.
06Flexible Control Power
Operating and auxiliary circuit configurations include AC/DC 220V and DC 110V options.
Construction & Operating Mechanism
The ZW7-40.5 adopts a three-phase porcelain-column structure consisting of vacuum interrupter assemblies, conductive circuits, insulated support components, a drive system and a spring operating mechanism. The outdoor construction is designed to provide the required mechanical strength and electrical insulation for high-voltage service.
The vacuum interrupter forms the main interruption chamber of each phase. During an opening operation, the movable contact separates from the fixed contact and the resulting arc is confined within the vacuum interrupter. As the alternating current approaches its natural zero, the arc is extinguished and the circuit is interrupted.
The spring operating mechanism stores mechanical energy and transfers it through the drive linkage to perform opening and closing operations. This mechanical arrangement provides consistent switching motion and supports the specified O-0.3s-CO-180s-CO operating sequence.
Electrical Insulation & Outdoor Reliability
For a 40.5kV outdoor circuit breaker, insulation performance is critical to reliable operation under changing weather and electrical conditions. The ZW7-40.5 is designed with outdoor insulation components and a rated lightning impulse withstand voltage of 185kV peak.
The published technical data also specifies a power-frequency withstand voltage of 95kV under dry test conditions and 80kV under wet test conditions, providing insulation capability for outdoor high-voltage applications. :contentReference[oaicite:2]{index=2}
The outdoor structure is intended for installation in substations, utility distribution systems and industrial power environments. Site conditions such as altitude, pollution level, icing, wind and ambient temperature should be considered during final equipment selection.
