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Designed specifically for modern AC railway electrification systems, the 27.5kV Railway Vacuum Circuit Breaker provides dependable switching and protection for traction substations, sectioning posts, and feeder circuits where operational reliability is critical. Unlike conventional oil or gas-insulated equipment, this breaker utilizes a hermetically sealed vacuum interrupter that delivers excellent dielectric recovery, low contact erosion, and an exceptionally long maintenance interval. As a specialized solution within our railway switchgear portfolio, it complements the 27.5kV Outdoor Circuit Breaker for outdoor substations, the 27.5kV Vacuum Circuit Breaker for utility-grade switching applications, the Outdoor High Voltage Vacuum Circuit Breaker for harsh environmental installations, and the compact 27.5kV Vacuum Breaker for space-constrained projects. Fully compliant with IEC 62271-100, IEC 62271-1 and EN 50124 railway insulation requirements, the breaker supports digital substation automation while maintaining stable operation in demanding outdoor environments including heavy pollution, coastal areas, snow, and high-altitude railway corridors.
Developed for continuous railway operation, the breaker emphasizes operational availability rather than simply interruption capability. Its modular construction enables rapid component replacement while minimizing service interruptions during maintenance windows. The vacuum interrupter is permanently sealed, eliminating gas monitoring, refilling, or contamination risks. A spring-operated stored-energy mechanism provides consistent opening and closing speeds regardless of auxiliary voltage fluctuations, ensuring reliable protection during emergency conditions. Intelligent control systems support remote diagnostics, event recording, fault waveform analysis, condition monitoring, and integration with SCADA, RTU, and railway dispatch systems. This makes the breaker particularly suitable for intelligent railway substations, high-speed rail projects, metro systems, heavy-haul freight corridors, and electrified industrial transportation networks requiring high operational availability.
| Parameter | Unit | Specification |
|---|---|---|
| Rated Voltage | kV | 27.5 |
| System Frequency | Hz | 50 / 60 |
| Rated Continuous Current | A | 630 / 1250 / 1600 |
| Rated Short-Circuit Breaking Current | kA | 20 / 25 / 31.5 |
| Rated Short-Time Withstand Current (3s) | kA | 20 / 25 / 31.5 |
| Rated Peak Withstand Current | kA | 50 / 63 / 80 |
| Power Frequency Withstand Voltage | kV | 80 |
| Lightning Impulse Withstand Voltage (BIL) | kV | 185 |
| Mechanical Life | Operations | ≥10,000 |
| Electrical Life | Operations | Up to 10,000 at rated current |
| Opening Time | ms | ≤50 |
| Total Breaking Time | ms | ≤60 |
| Closing Time | ms | ≤80 |
| Operating Sequence | - | O-0.3s-CO-180s-CO |
| Control Voltage | V DC | 110 / 220 |
| Motor Supply Voltage | V DC | 110 / 220 |
| Protection Degree | IP | IP55 |
| Ambient Temperature | °C | -40 to +55 |
| Maximum Installation Altitude | m | 2000 (higher available) |
| Applicable Standards | - | IEC 62271-100, IEC 62271-1, EN 50124-1 |
The vacuum interrupter employs copper-chromium alloy contacts optimized for railway switching duty, delivering excellent arc resistance and low contact erosion even under repetitive fault interruption. Cycloaliphatic epoxy insulation provides superior hydrophobic performance while resisting tracking, UV aging, and environmental contamination. The galvanized steel supporting frame undergoes hot-dip galvanizing followed by outdoor powder coating, significantly extending corrosion resistance in coastal and industrial environments. Stainless steel fasteners, weatherproof cable entries, anti-condensation heaters, and sealed bearings collectively reduce maintenance requirements throughout the equipment lifecycle.
The 27.5kV Railway Vacuum Circuit Breaker is widely deployed across electrified railway infrastructure, including traction substations, feeder bays, sectioning stations, subsectioning stations, neutral sections, overhead catenary switching points, depot power distribution systems, metro traction networks, intercity railways, heavy-haul freight corridors, mining rail transportation systems, and railway modernization projects replacing aging oil or SF₆ circuit breakers. Its combination of compact dimensions, intelligent protection, long electrical life, and maintenance-friendly construction makes it an ideal choice for both newly built railway electrification projects and existing infrastructure upgrades.
Every 27.5kV Railway Vacuum Circuit Breaker is manufactured under a strict quality management system and undergoes comprehensive routine testing before shipment, including mechanical operation testing, contact resistance measurement, power-frequency withstand testing, lightning impulse verification, timing analysis, insulation resistance testing, and factory acceptance inspection. We provide complete engineering support covering technical consultation, protection coordination, customization, OEM/ODM manufacturing, FAT documentation, commissioning guidance, spare parts supply, and long-term after-sales service, helping railway operators improve system reliability while reducing lifecycle operating costs.
