The 33KV Outdoor SF6 Circuit Breaker from Wzonpa, a professional China manufacturer, supplier, and factory, is engineered for medium-to-high voltage power transmission systems requiring stable interruption performance and long service life. It is designed with a compact porcelain column structure and CT14 spring operating mechanism, ensuring safe operation in harsh outdoor environments while maintaining high mechanical reliability and low maintenance demand.
High breaking reliability: Stable arc extinction using SF6 gas ensures safe interruption under high load conditions.
Long mechanical lifespan: More than 3000 operating cycles for long-term grid stability.
High-accuracy CT integration: Amorphous alloy current transformer with 0.2/0.2S accuracy level.
Compact structure design: Easy installation and commissioning in substations and outdoor grids.
Low maintenance cost: SF6 insulation system reduces operational wear and service frequency.
The 33KV Outdoor SF6 Circuit Breaker adopts SF6 gas as arc-quenching medium, offering superior dielectric recovery performance. It can safely interrupt unloaded transmission lines up to 50 km without re-ignition risk. The spring operating mechanism ensures fast response, with opening time ≤0.06s and closing time ≤0.1s, supporting reliable grid protection under fault conditions.
The 33KV Outdoor SF6 Circuit Breaker is widely applied in:
Power generation plants and transmission substations
Industrial and mining power distribution networks
Rural and regional grid expansion projects
Outdoor air-insulated and hybrid substations
Its stable insulation performance ensures reliable operation even in high-altitude and extreme temperature regions.
Compared with oil or vacuum-based interrupters, the 33KV Outdoor SF6 Circuit Breaker provides:
Stronger arc extinguishing capability under high voltage stress
Lower operational noise and improved environmental adaptability
Reduced maintenance requirements over long service cycles
Higher insulation recovery speed after current interruption
| Item | Unit | Parameters |
| Rated voltage | KV | 40.5 |
| Lightning impulse withstand voltage(peak value) | KV | 185 |
| Rated insulated level 1-minute power frequency withstand voltage | KV | 95 |
| Rated current | A | 2000 |
| Mechanical lifespan | Times | 3000 |
| Rated pressure of sulfur hexafluoride gas(gauge pressure at 20℃) | Mpa | 0.5 |
| Alarm pressure/minimum functional pressure(gauge pressure at 20℃) | Mpa | 0.47/0.45 |
| Rated short-circuit breaking current | 40 | |
| Rated short-circuit making current(peak) | KA | 100 |
| Rated short-time withstand current(thermal stability current) | 40 | |
| Rated peak withstand current(dynamic stability current) | KA | 100 |
| Rated out of step breaking current | KA | 10 |
| Accumulated breaking times under rated short-circuit breaking current | Times | 12 |
| Rated short-circuit duration | S | 4 |
| Closing time(at rated operating voltage) | S | ≤0.1 |
| Opening time(at rated operating voltage) | S | ≤0.06 |
| Rated operating sequence | A | 0-0.3S-CO-180S-CO |
| Rated opening and closing current of a single capacitor bank | 400 | |
| Annual gas leakage rate | % | ≤1 |
| Moisture content of sulfur hexafluoride gas (VV) | ≤150x10-6 | |
| Rated operating voltage for CT14 type spring operated mechanism | ||
| Voltage of closing coil and opening coil | V | AC:220 380 DC:48 110 220 |
| Energy storage motor voltage | V | AC:220 380 DC:110 220 |
| Weight of sulfur hexafluoride gas | kg | 8 |
| Weight of circuit breaker(including operating mechanism) | kg | 1400 |
| Item | Unit | Parameters | Technical requirement |
| Moving contact stroke | mm | 95±2 | Measure the travel of the moving contact |
| Contact opening distance | mm | 60±1.5 | Measure the distance between the dynamic and static arc heads |
| Periodic closing between poles | M/S | ≤3 | Measure the difference in distance between the dynamic and static arc contacts |
| Synchronization of inter pole opening | M/S | ≤2 | Measure the difference in distance between the dynamic and static arc contacts |
| Main circuit resistance | mΩ | ≤120 |
Direct
charging voltage drop method for measurement,with current passing
through during measurement |
| Closing speed | M/S | 3.2±0.2 | Rated air pressure and measurement method |
| Opening speed | M/S | 3.4±0.2 | Customer specific air pressure and measurement method |
| Closing with slow stroke | mm | 10+1.5 | In the closed state |
| Positioning room for closing buffer | mm | 1~2 | In the closed state |
| Part 48.6kV | PC | 20 |
Measure
with a partial discharge meter at rated pressure,apply a voltage of 48. 6kV to both output terminals of the circuit breaker,hold for 1 minute for measurement,and then reduce the voltage to 28kV for measurement |
| Discharge 28kV | PC | 10 |
Q1: Why is SF6 gas used in this breaker?
A: SF6 gas has strong electronegativity and excellent arc-quenching ability, allowing rapid electron absorption and fast dielectric recovery after interruption.
Q2: What environments can the 33KV Outdoor SF6 Circuit Breaker operate in?
A: It is suitable for high-altitude areas up to 3000m, temperatures from -40°C to +40°C, and environments without heavy pollution or corrosive gases.
Q3: How reliable is the mechanical performance?
A: The breaker supports over 3000 mechanical operations, ensuring long-term durability in frequent switching conditions.
Q4: What makes Wzonpa’s product different from others?
A: The 33KV Outdoor SF6 Circuit Breaker combines high-precision CT integration, compact design, and stable SF6 insulation performance, ensuring higher operational safety and efficiency compared to conventional solutions.
Address
No. 58 Binhainan Fourth Road, Economic Development Zone, Yueqing City, Wenzhou City, Zhejiang Province, China
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