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Designed for railway traction substations, industrial power distribution, and harsh outdoor switching environments, the 27.5kV Outdoor Circuit Breaker provides reliable medium-voltage interruption with advanced vacuum technology and a rugged mechanical structure. Unlike conventional SF6-based solutions, this vacuum circuit breaker uses a sealed vacuum interrupter to achieve rapid arc extinction, eliminating gas handling requirements while reducing maintenance complexity throughout the equipment lifecycle. As a specialized 27.5kV Vacuum Circuit Breaker, it is engineered for AC traction power systems, feeder protection, and outdoor substations where high reliability and fast fault clearance are essential.
The 27.5kV Outdoor Circuit Breaker adopts a compact outdoor design with solid insulation technology, corrosion-resistant housing, and a motor-driven spring operating mechanism. The fully sealed vacuum interrupter ensures stable dielectric performance under frequent switching operations, while the optimized contact structure reduces contact erosion and extends electrical service life. For railway electrification projects requiring dependable overhead line protection, the Outdoor High Voltage Vacuum Circuit Breaker configuration delivers excellent insulation coordination, mechanical endurance, and environmental adaptability.
Engineered according to international requirements including IEC 62271-100 and GB/T 1984, this breaker is suitable for traction substations, railway feeder systems, industrial plants, renewable energy collection networks, and other medium-voltage applications. Its maintenance-free vacuum interrupter, flexible control options, and intelligent protection compatibility make it an ideal choice for modern power infrastructure upgrades.
| Parameter | Specification |
|---|---|
| Rated voltage | 27.5 kV AC |
| Rated frequency | 50 Hz / 60 Hz |
| Rated current | 630 A / 1250 A / 2000 A |
| Rated short-circuit breaking current | 20 kA / 25 kA / 31.5 kA |
| Rated short-time withstand current (3s) | 25 kA |
| Rated short-circuit making current | 63 kA peak |
| Power frequency withstand voltage | 80 kV (dry) / 65 kV (wet) |
| Lightning impulse withstand voltage | 185 kV peak |
| Insulation medium | Vacuum interrupter |
| Mechanical endurance | ≥10,000 operations |
| Electrical endurance | ≥30 operations at rated short-circuit current |
| Opening time | ≤60 ms |
| Arcing time | ≤15 ms |
| Closing time | ≤100 ms |
| Operating sequence | O-0.3s-CO-180s-CO |
| Control voltage | DC 110 V / 220 V |
| Protection class | IP54 outdoor enclosure |
| Ambient temperature | -40°C to +45°C |
| Altitude | ≤2000 m (higher altitude customization available) |
| Approximate weight | 350 kg |
The breaker adopts a high-strength insulated pole structure with vacuum interrupters embedded inside solid insulation materials. The vacuum chamber uses copper-chromium alloy contacts and high-strength ceramic insulation shells to achieve excellent dielectric recovery characteristics after interruption. The optimized electromagnetic field distribution reduces contact temperature rise during continuous operation, improving reliability under heavy load conditions.
The operating mechanism features a stored-energy spring system with independent closing and tripping functions. Mechanical interlocking prevents incorrect operation, while the manual emergency release function allows safe maintenance procedures during power outages. The control cabinet integrates terminal blocks, auxiliary contacts, protection interfaces, and monitoring modules for easy connection with railway protection systems or industrial automation platforms.
As an experienced manufacturer of medium and high-voltage switching equipment, we provide customized 27.5kV Outdoor Circuit Breaker solutions for railway operators, utilities, EPC contractors, and industrial customers worldwide. Each unit is tested for insulation performance, contact resistance, mechanical operation, and dielectric strength before shipment. With reliable vacuum interruption technology, flexible configuration options, and long service life, our breakers provide a dependable protection solution for critical power networks.
