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In modern medium-voltage substations, circuit breakers play a decisive role in maintaining grid stability, protecting critical electrical assets, and minimizing service interruptions. The 35KV Substation Circuit Breaker is designed for transformer feeders, incoming lines, bus couplers, and industrial distribution systems where dependable switching performance is essential. Unlike conventional interruption equipment that requires frequent maintenance, this breaker adopts advanced vacuum interruption technology to achieve fast fault clearing, excellent dielectric recovery, and long operational life.
Developed for utility companies, EPC contractors, and industrial power users, this High Voltage Vacuum Circuit Breaker provides flexible installation options including indoor switchgear integration and outdoor substation applications. Its modular structure allows easy adaptation for different protection schemes, while compatibility with intelligent protection relays and automation systems supports modern digital substations. For outdoor environments requiring enhanced weather resistance, it can be configured as an Outdoor Vacuum Circuit Breaker with reinforced enclosure protection and anti-condensation solutions.
The core advantage of the 35KV Substation Circuit Breaker lies in its optimized combination of electrical endurance, mechanical reliability, and simplified maintenance. The sealed vacuum interrupter prevents contamination of the contact system, ensuring stable breaking performance throughout the service lifetime. High-strength epoxy insulation provides excellent resistance against humidity, dust, and pollution, making the breaker suitable for demanding industrial and utility applications.
The operating mechanism uses a stored-energy spring system or optional permanent magnetic actuator to deliver precise opening and closing actions. Intelligent secondary control interfaces enable remote operation, status monitoring, and integration with SCADA platforms. For substations requiring accurate protection coordination, the breaker can be equipped with integrated sensing components similar to a Current Transformer Circuit Breaker configuration, improving fault detection accuracy while reducing installation complexity.
| Parameter | Specification |
|---|---|
| Rated Voltage | 35 kV (40.5 kV maximum design) |
| Rated Frequency | 50 Hz / 60 Hz |
| Rated Current | 630 A / 1250 A / 2000 A / 2500 A |
| Rated Short Circuit Breaking Current | 20 kA / 25 kA / 31.5 kA |
| Rated Short Circuit Making Current | 50 kA / 63 kA / 80 kA peak |
| Rated Short-Time Withstand Current | 20 kA / 25 kA / 31.5 kA (3s) |
| Power Frequency Withstand Voltage | 95 kV (1 minute) |
| Lightning Impulse Withstand Voltage | 185 kV peak |
| Interruption Medium | Vacuum interrupter |
| Operating Mechanism | Spring stored energy / Permanent magnetic actuator |
| Mechanical Endurance | 10,000 - 30,000 operations |
| Electrical Endurance | 30 full-rated short circuit operations |
| Closing Time | ≤ 80 ms |
| Opening Time | ≤ 50 ms |
| Control Voltage | DC 24V / 48V / 110V / 220V |
| Auxiliary Contacts | 8NO + 8NC (customizable) |
| Protection Degree | IP4X indoor / IP65 outdoor option |
| Operating Temperature | -30°C to +55°C |
| Applicable Standards | IEC 62271-100, GB/T 1984, ANSI C37.06 |
| Comparison Item | 35KV Vacuum Circuit Breaker | Traditional Oil Circuit Breaker |
|---|---|---|
| Arc Extinguishing Medium | Vacuum interruption technology | Insulating oil |
| Maintenance Requirement | Low maintenance, sealed interrupter design | Requires oil inspection and replacement |
| Environmental Impact | No oil leakage and no SF6 gas emission | Risk of oil contamination |
| Operating Speed | Fast opening and closing response | Relatively slower mechanical response |
| Service Life | Long electrical and mechanical endurance | Reduced performance after repeated operation |
| Smart Grid Integration | Compatible with SCADA and digital protection systems | Limited communication capability |
The 35KV Substation Circuit Breaker is widely used in utility substations, industrial power distribution systems, renewable energy projects, and transformer protection applications where reliable medium-voltage switching is required.
Vacuum circuit breakers provide cleaner interruption, lower maintenance requirements, longer service life, and improved environmental performance because they do not rely on insulating oil for arc extinction.
Yes. The breaker supports integration with protection relays, RTUs, and SCADA systems through standard communication interfaces, enabling remote operation and condition monitoring.
Customers can select different rated currents, breaking capacities, installation structures, control voltages, CT/VT configurations, communication modules, and outdoor protection options according to project requirements.
With proper installation and operation, the vacuum interrupter and mechanical mechanism are designed for long-term service, supporting thousands of switching cycles with stable performance.
As a professional medium-voltage switchgear manufacturer, we provide complete engineering support from product selection and technical customization to testing documentation and after-sales service. Each 35KV Substation Circuit Breaker is factory tested before shipment to ensure insulation performance, mechanical operation reliability, and compliance with international standards. With flexible OEM capability and project experience, our solutions support global utilities, EPC contractors, and industrial customers seeking reliable power protection equipment.
