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27.5kV Outdoor High Voltage Circuit Breaker (Model: ZW7-27.5) is a high-performance outdoor vacuum circuit breaker designed for railway traction power systems, substations, utility distribution networks, and industrial power applications. Equipped with a high-quality vacuum interrupter and a maintenance-free operating mechanism, it provides reliable switching, overload protection, and short-circuit interruption for medium-voltage electrical systems.
Designed for long-term outdoor operation, the circuit breaker offers excellent insulation performance, high breaking capacity, and outstanding mechanical durability. Standard voltage ratings include 24kV, 27.5kV, 33kV, and 40.5kV, while customized configurations are available to meet specific project requirements, drawings, and technical specifications.
The ZW7 series combines compact construction, dependable operation, and flexible customization, making it an ideal solution for railway electrification projects, utility substations, renewable energy systems, and industrial distribution networks requiring safe and efficient power protection.
| Item | Specification |
| Rated Voltage | 24 / 27.5 / 33 / 40.5kV |
| Lightning Impulse Withstand Voltage | 185kV |
| Rated Current | 1250A / 1600A / 2000A |
| Rated Short-Circuit Breaking Current | 20 / 25 / 31.5kA |
| Rated Operating Sequence | O-0.3s-CO-180s-CO |
| Rated Short-Circuit Breaking Operations | 12 Times |
| Rated Peak Withstand Current | 50 / 63 / 80kA |
| Rated Short-Time Withstand Current | 20 / 25 / 31.5kA |
| Rated Short-Time Duration | 4s |
| Average Opening Speed | 1.5 ± 0.2m/s |
| Average Closing Speed | 0.7 ± 0.2m/s |
| Contact Bounce Time | ≤2ms |
| Closing Time | ≤150ms |
| Opening Time | ≤60ms |
| Mechanical Life | 10,000 Times |
| Rated Operating Voltage | DC220V / DC110V / DC24V |
| Auxiliary Circuit Voltage | AC220V / AC110V / AC24V |
| Permissible Contact Wear | 3mm |
The 27.5kV Outdoor High Voltage Circuit Breaker is widely used in medium-voltage power systems that require reliable switching, protection, and control.
The 27.5kV Outdoor High Voltage Circuit Breaker utilizes a sealed vacuum interrupter to extinguish electrical arcs generated during switching operations. When a fault occurs, the operating mechanism rapidly separates the contacts, allowing the vacuum chamber to interrupt the fault current efficiently without the use of insulating oil or SF6 gas. This design minimizes maintenance requirements while providing high dielectric strength, excellent switching performance, and long service life.
Its modular construction also supports customized voltage ratings, operating mechanisms, insulation configurations, and installation dimensions to meet the requirements of different utility and railway projects worldwide.
What is a 27.5kV Outdoor High Voltage Circuit Breaker used for?
It is designed to protect and control medium-voltage electrical systems by interrupting load currents, overloads, and short-circuit faults in railway, utility, and industrial power networks.
Why use a vacuum circuit breaker instead of an oil circuit breaker?
Vacuum circuit breakers offer faster arc extinction, longer service life, lower maintenance requirements, improved environmental performance, and higher operational reliability.
Can the circuit breaker be customized?
Yes. Voltage ratings, mounting structures, operating mechanisms, insulation configurations, and other technical parameters can be customized according to project drawings and customer specifications.
Which industries commonly use this circuit breaker?
It is widely used in railway electrification, utility substations, renewable energy projects, industrial power distribution, mining operations, and infrastructure construction.
Address
Jinlu Industrial Zone, Beibaixiang Town, Yueqing City, Wenzhou City, Zhejiang Province, China
