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FLW36-126
Fenarro
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This breaker adopts a three-phase porcelain post single-break structure, operated by a centrally located spring mechanism that drives all three poles simultaneously. Its SF6 chamber is interconnected across all three poles, monitored by a pointer-type density relay. With optimized motion system design and self-energy arc-extinguishing principle, it achieves high mechanical efficiency and reduced operating power. The breaker is resistant to corrosion due to hot-dip galvanizing and stainless-steel components, ensuring reliable performance in harsh environments.
Innovative structure – Three-phase porcelain post design with central spring operating mechanism
Excellent breaking performance – Long electrical life with reliable arc-extinguishing
High corrosion resistance – Stainless steel housing and hot-dip galvanized structural components
High mechanical reliability – Suitable for frequent operations
No restrike – Optimized contact motion ensures no reignition when breaking capacitive currents
Strong insulation performance – External insulation adopts large creepage design (creepage distance 31mm/kV), excellent pollution resistance
High current capacity – Passed temperature rise test at 1.2 times rated current (3780A), maintaining thermal margin
Compact and efficient – Simple installation, low maintenance workload, and compact structure
Main Technical Parameters of Circuit Breaker
| Serial Number | Name | Unit | Parameter |
|---|---|---|---|
| 1 | Rated Voltage | 126 | |
| 2 | Rated Power Frequency Withstand Voltage (1min) | kV | To ground: 230 Between fracture ports: 265 |
| 3 | Rated Lightning Impulse Withstand Voltage | kV | To ground: 550 Between fracture ports: 630 |
| 4 | Power Frequency Withstand Voltage of SF₆ Gas at Zero Pressure (5min) | 95 | |
| 5 | Rated Frequency | Hz | 50 |
| 6 | Rated Current | A | 3150 |
| 7 | First Opening Coefficient | 1.5 | |
| 8 | Rated Short - Circuit Breaking Current | 40 | |
| 9 | Rated Short - Circuit Making Current (Peak Value) | kA | 100 |
| 10 | Rated Short - Circuit Withstand Current | kA | 40 |
| 11 | Rated Peak Withstand Current | 100 | |
| 12 | Rated Short - Circuit Duration | s | 4 |
| 13 | Rated Step - by - Step Breaking Current | kA | 10 |
| 14 | Near - Fault Breaking Current | kA | 90%Ik, 75%Ik |
| 15 | Rated Line Charging Closing Current | A | 31.5 |
| 16 | Rated Operating Sequence | O - 0.3s - CO - 180s - CO | |
| 17 | Main Circuit Resistance | μΩ | ≤80 |
| 18 | Rated Sulfur Hexafluoride Gas Pressure (20°C Gauge Pressure) | Mpa | 0.6 |
| 19 | Alarm/Lowest Functional Pressure (20°C Gauge Pressure) | Mpa | 0.52±0.03/0.50±0.03 |
| 20 | SF₆ Gas Annual Leakage Rate | <0.5% | |
| 21 | Gas Moisture Content (V/V) | ≤150×10⁻⁶ | |
| 22 | Mechanical Life | times | 10000 |
| 23 | Radio Interference Level | μV | ≤5000 |
| 24 | Creepage Distance | mm | Between fracture ports: 3906/3150 To ground: 3906/3150 |
| 25 | Mass of SF₆ Gas Filled into Each Unit | kg | 10 |
| 26 | Mass of Each Circuit Breaker | kg | 1500 |
| No. | Name | Unit | Parameter |
|---|---|---|---|
| 1 | Auxiliary circuit voltage | V | DC220 or DC110 |
| 2 | Voltage/current of opening/closing coil | V/A | DC110/4; DC220/2 |
| 3 | Energy storage motor | - | Rated voltage: DC220, AC220/DC110, AC110 Normal operating voltage range: 85% - 110% V Power: 600 W |
| 4 | Motor energy storage time | s | ≤15 |
| 5 | Voltage of heater and lighting circuit | V | AC220 |
| 6 | Rated voltage of auxiliary switch | V | DC220, AC220 |
| 7 | Rated current of auxiliary switch | A | 10 |
| 8 | Number of auxiliary switch contacts | - | 10 normally open + 10 normally closed |
| No. | Name | Unit | Parameter |
|---|---|---|---|
| 1 | Center distance between poles of circuit breaker | mm | 1700 |
| 2 | Stroke of moving contact | mm | 1200+2 |
| 3 | Contact stroke of moving contact | mm | 250+2 |
| 4 | Stroke of inter - phase operating connecting rod of circuit breaker (chord length) | mm | 1100+3 |
| 5 | Opening speed | m/s | 4.2 - 5m/s |
| 6 | Closing speed | m/s | 2.2 - 3m/s |
| 7 | Opening time | ms | ≤40 |
| 8 | Closing time | ms | ≤100 |
| 9 | Breaking time | ms | ≤60 |
| 10 | Close - open time | ms | ≤80 |
| 11 | Open - close time | ms | 300 |
| 12 | Three - phase opening asynchronism | ms | ≤2 |
| 13 | Three - phase closing asynchronism | ms | ≤3 |
Outdoor substations and transmission lines
High-altitude regions up to 2000m (or higher on request)
Harsh climates down to -40℃
Power systems requiring high breaking capacity and frequent operation
Tie breaker applications in grid connection
Breaker model and specifications
Rated electrical parameters (voltage, current, breaking current, etc.)
Operating environment (ambient temperature, altitude, pollution level)
Rated control circuit parameters (motor voltage, trip/close coil voltage)
Required spare parts, tools, or special equipment (to be ordered separately)
Connection direction of primary upper terminals
Fenarro (www.fenarro.com) specializes in high-voltage power equipment, including SF6 circuit breakers, vacuum circuit breakers, and complete switchgear solutions. With advanced technology, strict quality control, and a focus on innovation, Fenarro ensures safe, reliable, and efficient solutions for global power systems.
