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The 35KV Vacuum Circuit Breaker is designed for power system operators who require stable switching performance, fast fault isolation, and simplified equipment management in medium-voltage networks. Rather than focusing only on interruption capability, this breaker is optimized around the complete lifecycle of electrical assets, including installation efficiency, operational safety, maintenance reduction, and future grid expansion.
Used in utility substations, industrial distribution systems, renewable energy plants, and infrastructure projects, the breaker provides dependable protection for transformers, feeders, motors, and bus sections. Its vacuum interruption chamber creates a controlled arc-extinguishing environment, allowing reliable breaking performance without the maintenance challenges associated with oil-based switching equipment. For projects requiring different voltage levels, the same engineering platform can be extended to products such as the 40.5KV Vacuum Circuit Breaker and other High Voltage Vacuum Circuit Breaker solutions.
The main design philosophy of the 35KV Vacuum Circuit Breaker is to provide a balance between high electrical performance and practical field operation. The embedded pole structure improves insulation reliability by protecting the vacuum interrupter from dust, humidity, and mechanical impact. The compact construction reduces switchgear footprint while allowing flexible integration into existing substation layouts.
For outdoor applications, the breaker can be configured with enhanced insulation coordination, corrosion-resistant components, and sealed operating compartments similar to an Outdoor Vacuum Circuit Breaker. In substation projects, it works together with protection relays, current transformers, and automation systems to create a complete protection solution comparable to a 35KV Substation Circuit Breaker assembly.
| Parameter | Specification |
|---|---|
| Rated Voltage | 35 kV (Maximum system voltage 40.5 kV) |
| Rated Frequency | 50 Hz / 60 Hz |
| Rated Current | 630 A / 1250 A / 1600 A / 2000 A / 3150 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 |
| Vacuum Degree of Interrupter | ≤1.33×10⁻³ Pa |
| Operating Mechanism | Spring stored energy mechanism / Permanent magnetic actuator |
| Mechanical Endurance | 10,000 operations (M2 class) |
| Electrical Endurance | 30 full short-circuit breaking operations |
| Opening Time | ≤50 ms |
| Closing Time | ≤80 ms |
| Control Voltage | DC 24V / 48V / 110V / 220V |
| Auxiliary Contacts | 8NO + 8NC (customizable) |
| Protection Level | IP4X indoor / IP54-IP65 outdoor option |
| Operating Temperature | -30°C to +55°C |
| Applicable Standards | IEC 62271-100, IEC 62271-1, GB/T 1984, ANSI C37 |
| Comparison Item | 35KV Vacuum Circuit Breaker | Oil Circuit Breaker | SF6 Circuit Breaker |
|---|---|---|---|
| Arc Extinguishing Method | Vacuum interrupter | Insulating oil | SF6 gas |
| Maintenance Requirement | Low maintenance, sealed chamber | Requires oil inspection and replacement | Requires gas monitoring |
| Environmental Performance | No oil leakage, no greenhouse gas emission | Potential oil contamination risk | Requires SF6 handling management |
| Switching Speed | Fast arc extinction and high response speed | Slower interruption process | Fast operation but complex gas system |
| Installation Space | Compact structure | Larger mechanical structure | Additional gas insulation space required |
| Lifecycle Cost | Lower long-term operating cost | Higher maintenance expense | Higher monitoring requirements |
A 35KV Vacuum Circuit Breaker is mainly used for switching and protecting medium-voltage electrical systems, including substations, industrial plants, renewable energy projects, transformers, and feeder circuits.
Vacuum interruption provides fast arc extinction, excellent dielectric recovery, low contact erosion, and long service life without requiring oil replacement or gas maintenance.
Yes. The compact structure and flexible mounting design make it suitable for retrofit projects replacing aging oil circuit breakers in existing substations.
Yes. The breaker can integrate with digital protection relays, RTUs, and SCADA systems through communication interfaces for remote monitoring and control.
Customization options include rated current, breaking capacity, installation type, control voltage, CT/VT integration, communication modules, outdoor enclosure design, and accessory configuration.
As an experienced medium-voltage switchgear manufacturer, we provide complete solutions covering engineering consultation, customized production, factory testing, and technical support. Each 35KV Vacuum Circuit Breaker is tested for insulation performance, contact resistance, mechanical operation, and switching reliability before delivery. With flexible OEM capability and international project experience, our breakers provide dependable protection solutions for utilities, EPC contractors, and industrial power users worldwide.
