Whatsapp
The 27.5kV Vacuum Breaker is engineered for mission-critical switching applications where operational continuity, low lifecycle costs, and intelligent grid integration are equally important. Designed for railway electrification, utility substations, mining power systems, and industrial distribution networks, this breaker combines advanced vacuum interruption technology with a highly reliable stored-energy operating mechanism to provide stable protection throughout decades of service. As part of our complete medium-voltage product portfolio, the 27.5kV Vacuum Circuit Breaker delivers exceptional interruption capability for traction power systems, while the 27.5kV Outdoor Circuit Breaker provides dependable outdoor protection under demanding environmental conditions. For heavy-duty transmission projects, the Outdoor High Voltage Vacuum Circuit Breaker offers superior insulation coordination, while the Outdoor Vacuum Circuit Breaker series is widely deployed wherever compact dimensions, environmental sustainability, and maintenance-free operation are required.
Rather than focusing solely on fault interruption, the 27.5kV Vacuum Breaker is designed to optimize long-term asset performance throughout its entire service life. Every component—from the vacuum interrupter and actuator mechanism to the insulation system and intelligent controller—is selected to reduce maintenance frequency, improve operational availability, and simplify future upgrades. The modular architecture enables rapid replacement of operating mechanisms or electronic modules without dismantling the primary current path, significantly shortening maintenance outages. Advanced condition monitoring continuously evaluates operating times, spring charging cycles, operation counts, auxiliary circuit health, and trip circuit integrity, allowing utilities to transition from scheduled maintenance to predictive maintenance strategies.
| Specification | Unit | Value |
|---|---|---|
| Rated Voltage | kV | 27.5 |
| Rated Frequency | Hz | 50 / 60 |
| Rated Continuous Current | A | 630 / 1250 / 2000 |
| Rated Short-Circuit Breaking Current | kA | 20 / 25 / 31.5 |
| Rated Short-Time Withstand Current | kA | 31.5 (3s) |
| Rated Peak Withstand Current | kA | 80 |
| Power Frequency Withstand Voltage | kV | 95 (Dry) |
| Lightning Impulse Withstand Voltage | kV | 185 |
| Mechanical Endurance | Operations | ≥10,000 |
| Opening Time | ms | ≤50 |
| Closing Time | ms | ≤80 |
| Operating Sequence | - | O-0.3s-CO-180s-CO |
| Auxiliary Voltage | VDC | 110 / 220 |
| Protection Degree | IP | IP55 |
| Operating Temperature | °C | -40 to +55 |
| Maximum Installation Altitude | m | 2000 |
| Applicable Standards | - | IEC 62271-100 / IEC 62271-1 / EN 50124-1 |
The breaker adopts a rigid galvanized steel support frame designed to withstand long-term mechanical loading and vibration generated by railway operations. The vacuum interrupter utilizes copper-chromium alloy contacts enclosed within a high-strength ceramic vacuum envelope, providing excellent dielectric recovery and minimal contact erosion. Outdoor insulation is available with porcelain or hydrophobic silicone rubber composite insulators to accommodate different pollution levels and climatic conditions. All exposed hardware is manufactured from stainless steel or hot-dip galvanized steel to maximize corrosion resistance and reduce maintenance requirements throughout the equipment lifecycle.
The 27.5kV Vacuum Breaker is suitable for railway traction substations, overhead contact line switching stations, feeder substations, electrical sectioning points, metro power supply systems, mining distribution stations, steel mills, petrochemical plants, renewable energy collector substations, industrial manufacturing facilities, and infrastructure modernization projects replacing aging oil or SF₆ circuit breakers. Its compact footprint also makes it an ideal solution for retrofit applications where installation space is limited but higher reliability is required.
We provide complete OEM and project-based manufacturing services for global EPC contractors, railway authorities, utilities, and switchgear manufacturers. Customization options include insulation configuration, operating mechanism, auxiliary contact arrangements, protection relay integration, communication protocols, foundation dimensions, terminal orientation, anti-corrosion coatings, altitude correction, tropical climate packages, and customer branding. Every breaker undergoes factory routine testing, timing analysis, dielectric verification, contact resistance testing, mechanical endurance inspection, and final quality validation before shipment, ensuring dependable field performance from initial commissioning through its entire operating life.
