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The 126KV SF6 Circuit Breaker is a high-voltage switching solution designed for 110kV–126kV transmission substations, utility power systems, renewable energy facilities, and industrial electrical networks. Utilizing sulfur hexafluoride (SF6) gas as both the insulating and arc-quenching medium, it delivers outstanding fault interruption performance, reliable insulation, and long-term operational stability under demanding service conditions.
Engineered for modern power infrastructure, our 126KV SF6 Circuit Breaker series combines advanced interruption technology, spring-operated mechanisms, intelligent monitoring functions, and modular construction to meet the requirements of today's smart substations. Whether protecting transmission lines, transformers, reactors, or grid interconnection projects, the breaker provides dependable switching performance while minimizing maintenance costs throughout its service life.
As a professional manufacturer of high-voltage switchgear, we offer multiple configurations including outdoor installation, transmission applications, high-voltage substations, and LW36 series circuit breakers. Every model is designed to comply with international standards while providing flexible customization for different utility projects worldwide.
| Feature | Customer Benefits |
|---|---|
| Advanced SF6 Arc Extinguishing Technology | Rapid fault interruption with excellent dielectric recovery and high interruption reliability. |
| High Mechanical Reliability | Spring-operated mechanism ensures stable opening and closing performance for more than 10,000 operations. |
| Low Lifecycle Cost | Sealed gas system and maintenance-friendly design reduce inspection frequency and operating expenses. |
| Flexible Product Configuration | Available for outdoor substations, transmission systems, transformer protection, and utility projects. |
| Smart Monitoring Capability | Supports SF6 density monitoring, auxiliary contacts, SCADA integration, and optional digital diagnostics. |
| International Project Experience | Suitable for utilities, EPC contractors, renewable energy developers, and industrial power systems. |
Our 126KV SF6 Circuit Breaker portfolio covers different application requirements while sharing the same high-quality interruption technology and manufacturing standards.
| Product Series | Typical Application | Main Advantages |
|---|---|---|
| Outdoor SF6 Circuit Breaker | Outdoor transmission substations | Excellent weather resistance and environmental adaptability |
| High Voltage SF6 Circuit Breaker | Power utility substations | High interruption capacity with reliable insulation performance |
| Transmission SF6 Circuit Breaker | Long-distance transmission lines | Stable switching for critical transmission infrastructure |
| LW36-126 SF6 Circuit Breaker | Standard utility projects | Proven operating mechanism with low maintenance requirements |
The 126KV SF6 Circuit Breaker is widely used wherever reliable interruption of high-voltage fault currents is required. Its robust design and advanced insulation technology make it suitable for various power transmission and distribution applications.
| Parameter | Specification |
|---|---|
| Rated Voltage | 126 kV |
| Rated Frequency | 50 / 60 Hz |
| Rated Current | 2000A / 2500A / 3150A |
| Rated Short-Circuit Breaking Current | 31.5kA / 40kA |
| Rated Peak Withstand Current | 80kA / 100kA |
| Rated Short-Time Withstand Current | 31.5kA / 40kA (3 seconds) |
| Operating Mechanism | Motor-charged spring operating mechanism |
| SF6 Rated Gas Pressure | 0.50 MPa (20°C) |
| Alarm Pressure | 0.45 MPa |
| Lockout Pressure | 0.40 MPa |
| Mechanical Endurance | 10,000 operating cycles (M2 Class) |
| Electrical Endurance | E2 Class |
| Opening Time | ≤40 ms |
| Closing Time | ≤100 ms |
| Operating Sequence | O-0.3s-CO-180s-CO |
| Annual SF6 Leakage Rate | ≤0.5% |
| Performance Item | Value | Reference Standard |
|---|---|---|
| Power Frequency Withstand Voltage | 230 kV (1 min) | IEC 62271-100 |
| Lightning Impulse Withstand Voltage | 550 kV Peak | IEC 62271-100 |
| Rated Insulation Level | 230 / 550 kV | IEC Standards |
| First-Pole-to-Clear Factor | 1.3 / 1.5 | IEC 62271-100 |
| Creepage Distance | 31 mm/kV (Standard) | Heavy Pollution Option Available |
| Ambient Temperature | -40°C to +40°C | Optional Low-Temperature Configuration |
| Installation Altitude | ≤1000m | Up to 4000m Optional |
| Seismic Capability | Up to 0.5g | Optional Reinforced Structure |
The 126KV SF6 Circuit Breaker adopts an advanced self-blast and puffer-assisted interruption system that combines excellent arc-extinguishing capability with low operating energy consumption. During fault interruption, the thermal energy generated by the electric arc increases the pressure of the SF6 gas, creating a powerful gas flow that rapidly cools and extinguishes the arc at current zero. This optimized interruption principle significantly reduces contact erosion while extending the service life of the interrupter.
The breaker utilizes a modular pole design with high-strength porcelain or composite silicone rubber insulators, providing outstanding insulation performance and excellent resistance to contamination, humidity, ultraviolet radiation, and salt spray. The spring-operated mechanism delivers consistent opening and closing speeds, ensuring stable switching performance throughout the entire mechanical life of the equipment.
Modern transmission networks require circuit breakers capable of operating reliably under continuously changing environmental and electrical conditions. The 126KV SF6 Circuit Breaker is designed to provide dependable protection for critical power infrastructure by combining high dielectric strength, rapid fault interruption, intelligent monitoring, and low maintenance requirements.
| Installation Environment | Performance Features |
|---|---|
| Coastal Areas | Corrosion-resistant galvanized steel structure with optional composite insulators. |
| Heavy Pollution Zones | Extended creepage distance and hydrophobic insulation surface improve reliability. |
| Cold Climate | Optional low-temperature operating mechanism and cabinet heating system. |
| High Altitude | Customized insulation coordination available for installations up to 4000 meters. |
| Seismic Areas | Reinforced support structure designed for demanding seismic applications. |
| High Humidity | Weatherproof operating cabinet with anti-condensation heater protects internal components. |
The breaker integrates multiple monitoring functions to improve equipment reliability and reduce maintenance costs. The temperature-compensated SF6 density monitor continuously supervises gas pressure and provides alarm and lockout signals before the operating pressure reaches unsafe levels. Auxiliary contacts, position indicators, and optional digital monitoring devices allow seamless integration with SCADA and intelligent substation automation systems.
Optional online monitoring solutions can collect operating times, mechanical movement characteristics, SF6 density, and contact wear data, helping utilities implement predictive maintenance strategies while improving asset management efficiency.
Every 126KV SF6 Circuit Breaker is manufactured under strict quality management procedures to ensure reliable long-term operation in high-voltage transmission systems. From component machining to final assembly, every production stage follows standardized inspection processes to guarantee product consistency and performance.
The 126KV SF6 Circuit Breaker is designed in accordance with internationally recognized standards for high-voltage switchgear and control equipment.
| Standard | Description |
|---|---|
| IEC 62271-100 | High-voltage alternating-current circuit breakers |
| IEC 62271-1 | Common specifications for high-voltage switchgear |
| IEC 60376 | Technical grade SF6 gas requirements |
| IEC 61850 | Communication networks for digital substations (optional) |
| ISO 1461 | Hot-dip galvanized coating for corrosion protection |
| Comparison Item | 126KV SF6 Circuit Breaker | Conventional Air Circuit Breaker | Vacuum Circuit Breaker |
|---|---|---|---|
| Suitable Voltage Level | High Voltage (126kV) | Limited | Mainly Medium Voltage |
| Arc Extinguishing Capability | Excellent | Moderate | Excellent |
| Outdoor Performance | Excellent | Average | Good |
| Maintenance Frequency | Low | High | Low |
| Service Life | Very Long | Medium | Long |
It is a high-voltage switching device that uses sulfur hexafluoride gas as the insulating and arc-extinguishing medium to protect transmission lines, transformers, and substations by interrupting normal load currents and fault currents.
It is commonly installed in utility substations, renewable energy projects, industrial power distribution systems, railway substations, and high-voltage transmission networks operating between 110kV and 126kV.
SF6 gas provides excellent dielectric strength, outstanding arc-quenching capability, and reliable insulation performance, allowing compact equipment design and stable switching under high fault current conditions.
Yes. Rated current, control voltage, insulation configuration, operating mechanism, installation altitude, environmental protection level, and monitoring functions can all be customized according to project requirements.
Each breaker undergoes comprehensive factory testing, including mechanical operation tests, timing tests, insulation verification, SF6 leakage detection, contact resistance measurement, and routine electrical performance testing before delivery.
Looking for a reliable 126KV SF6 Circuit Breaker manufacturer and supplier for your next transmission or substation project? Our engineering team provides professional technical support, product customization, and complete high-voltage switching solutions for utilities, EPC contractors, and industrial power systems worldwide. Contact us today to receive detailed specifications, drawings, pricing, and expert project consultation.
