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Modern railway electrification and medium-voltage substations require more than high interrupting capacity—they demand long-term reliability, intelligent maintenance, and compatibility with digital power systems. Our 27.5kV Vacuum Circuit Breaker is developed to help utilities, EPC contractors, railway authorities, and industrial operators reduce outage risks while lowering lifetime operating costs.
Unlike conventional oil or gas insulated switching equipment, the 27.5kV Vacuum Circuit Breaker uses a hermetically sealed vacuum interrupter that completely eliminates oil leakage and SF6 emissions. Combined with a high-strength galvanized steel frame, corrosion-resistant enclosure, and precision spring operating mechanism, the breaker maintains stable performance in coastal regions, deserts, mountain railways, and heavy industrial environments.
The breaker is suitable for traction substations, feeder protection, overhead catenary systems, renewable energy substations, mining power systems, utility distribution networks, and industrial power plants. Optional intelligent controllers support remote operation, condition monitoring, event recording, protection coordination, and SCADA communication for smart grid applications.
| Item | Specification |
|---|---|
| Rated Voltage | 27.5kV |
| System Frequency | 50Hz / 60Hz |
| Rated Current | 630A / 1250A / 1600A / 2000A |
| Rated Short Circuit Breaking Current | 20kA / 25kA / 31.5kA |
| Rated Making Current | 50kA / 63kA / 80kA (Peak) |
| Short-Time Withstand Current | 20kA / 25kA / 31.5kA (3s) |
| Lightning Impulse Withstand Voltage | 185kV |
| Power Frequency Withstand Voltage | 80kV (1 min) |
| Mechanical Life | ≥10,000 Operations |
| Electrical Life | E2 Class |
| Opening Time | ≤45ms |
| Closing Time | ≤80ms |
| Total Breaking Time | ≤60ms |
| Operating Mechanism | Motor-Charged Spring / Permanent Magnetic (Optional) |
| Auxiliary Supply | 110VDC / 220VDC / 110VAC / 220VAC |
| Protection Degree | IP55 / IP65 Optional |
| Operating Temperature | -40℃ ~ +55℃ |
| Installation Altitude | ≤2000m (Customized for Higher Altitude) |
| Communication Protocols | IEC61850, IEC60870-5-101/104, Modbus, DNP3 |
| Applicable Standards | IEC 62271-100, IEC 62271-1, IEEE C37, GB/T 1984 |
| Comparison Item | Our 27.5kV Vacuum Circuit Breaker | Conventional Oil / SF6 Circuit Breaker |
|---|---|---|
| Arc Extinguishing Medium | Vacuum Interrupter | Oil or SF6 Gas |
| Environmental Impact | No Oil Leakage, No SF6 Emission | Requires Oil Maintenance or Gas Handling |
| Routine Maintenance | Very Low | Relatively High |
| Mechanical Life | ≥10,000 Operations | Usually Lower |
| Contact Wear | Minimal | Higher Contact Erosion |
| Operating Reliability | Excellent | Depends on Maintenance Frequency |
| Environmental Adaptability | Excellent for Severe Outdoor Conditions | More Sensitive to Pollution and Leakage |
| Digital Substation Compatibility | Supports SCADA & Smart Grid Integration | Often Requires Additional Upgrades |
| Total Life Cycle Cost | Lower | Higher |
It is widely used in railway traction substations, utility substations, renewable energy projects, mining operations, industrial distribution systems, and medium-voltage outdoor switching applications.
No. The breaker adopts sealed vacuum interruption technology and does not require SF6 gas or insulating oil, making it environmentally friendly and easier to maintain.
Yes. Optional intelligent controllers support IEC61850, IEC60870-5-101/104, DNP3 and Modbus protocols for remote monitoring, protection coordination, and automation.
We provide customized rated current, operating mechanism, control voltage, insulation configuration, CT/PT arrangement, communication protocol, enclosure protection level, mounting structure, and accessories according to project requirements.
The breaker is designed and tested according to IEC 62271-100, IEC 62271-1, GB/T 1984, IEEE C37 and other applicable international standards.
With proper installation and normal operating conditions, the vacuum interrupter offers more than 10,000 mechanical operations while requiring minimal routine maintenance, resulting in a service life exceeding 20 years in many utility applications.
As a professional China manufacturer of medium-voltage vacuum circuit breakers, we provide complete OEM and project-based engineering support, including customized drawings, electrical schematics, protection coordination, factory acceptance testing (FAT), third-party inspection, multilingual documentation, and global technical assistance. Our engineering team works closely with EPC contractors, utilities, railway authorities, and equipment distributors to deliver reliable switching solutions tailored to each project.
