LW-252 Outdoor High Voltage AC SF6 Circuit Breaker
The LW-252 Outdoor High Voltage AC SF6 Circuit Breaker is a reliable 252kV transmission-class switching device designed for high-voltage AC power systems. Utilizing advanced SF6 insulation and self-blast arc-extinguishing technology, it provides excellent interruption performance, stable operation, and long electrical service life. With a compact structure, high current carrying capability, and low maintenance design, the LW-252 is widely used in transmission substations, power grid systems, and extra-high-voltage applications.
Get a QuoteOverview
The LW-252 Outdoor High Voltage AC SF6 Circuit Breaker is developed for 252kV, 50Hz AC transmission systems, providing reliable switching, protection, and control functions for high-voltage power grids. It is designed to interrupt rated load current, overload current, and short-circuit fault current, while supporting transmission line switching and substation interconnection applications.
Using SF6 (Sulfur Hexafluoride) gas as both the insulation and arc-extinguishing medium, the LW-252 adopts advanced self-energy arc-quenching technology combined with a high-performance spring operating mechanism. Compared with traditional circuit breakers, it delivers extended electrical endurance, reduced operating energy consumption, lower mechanical noise, and enhanced operational reliability.
Featuring a compact structure, maintenance-friendly design, and excellent insulation performance, the LW-252 SF6 Circuit Breaker provides an efficient and reliable solution for modern 252kV transmission substations, and serves as an ideal alternative to imported high-voltage SF₆ circuit breaker products.
Operating Conditions
1. Maximum System Voltage:252kV;
2. Rated Frequency: 50Hz;
3. Installation: Outdoor;
4.Maximum Altitude: ≤ 2,000 m;
5. Ambient Temperature: Down to -30°C;
6. Pollution Level: IEC Class IV.
Model and meaning
Features
Advanced SF6 Self-Blast Arc Extinguishing Technology
The LW-252 SF6 Circuit Breaker adopts advanced self-energy (self-blast) arc-extinguishing technology, utilizing the excellent dielectric insulation and arc-quenching characteristics of SF6 gas to achieve reliable interruption performance.
Key advantages include:
- Excellent short-circuit current interruption capability
- Extended electrical endurance
- No restrike during fault current interruption
- Reduced operating energy requirements
- Stable and reliable switching performance
The optimized arc-extinguishing system ensures efficient operation under demanding high-voltage transmission conditions.
High-Performance Spring Operating Mechanism
Each pole of the LW-252 is equipped with an independent spring operating mechanism, while maintaining accurate synchronization among all three phases.
Main benefits include:
- Fast opening and closing operation
- High mechanical reliability
- Low energy consumption during operation
- Suitable for frequent switching applications
- Extended maintenance intervals
The advanced mechanism design improves operating stability and reduces long-term maintenance requirements.
Excellent Insulation Performance
The LW-252 is designed with extended creepage distance porcelain insulators to ensure reliable operation in challenging outdoor environments.
Key features include:
- SF6 gas insulation technology
- Compliance with IEC Pollution Class IV requirements
- Strong resistance to environmental contamination
- Reliable operation in coastal and industrial areas
- High lightning impulse withstand capability
An integrated SF6 gas density relay continuously monitors gas pressure and density, ensuring stable insulation performance throughout the equipment service life.
High Current Carrying Capability
The LW-252 Outdoor High Voltage SF6 Circuit Breaker is designed with sufficient thermal margin to support continuous high-current operation.
Performance features include:
- Rated current up to 4000A
- Continuous operation at 120% rated current (4800A)
- Excellent temperature rise characteristics
- Low contact resistance
- Stable long-term current-carrying performance
Corrosion-Resistant Outdoor Construction
Designed for decades of outdoor service, the LW-252 incorporates multiple corrosion protection measures to maintain reliable operation in harsh environments.
Construction features include:
- Stainless steel operating mechanism cabinet
- Hot-dip galvanized support structures
- Corrosion-resistant fastening components
- Weather-resistant enclosure design
- Long service life with reduced maintenance requirements
Compact Structure and Simplified Installation
The three-pole single-break configuration reduces equipment footprint while simplifying transportation, installation, commissioning, and maintenance.
Main advantages include:
- Compact overall dimensions
- Convenient transportation
- Easy field installation
- Reduced maintenance workload
- Improved inspection accessibility
Technical Data
Spring Operating Mechanism
| Item | Specification |
| Auxiliary Circuit Voltage | DC220V / AC220V |
| Trip Coil Voltage | DC110V / DC220V |
| Closing Coil Voltage | DC110V / DC220V |
| Energy Storage Motor Voltage | DC220V / AC220V |
| Motor Operating Voltage | 85%–110% Rated Voltage |
| Motor Power | 600W |
| Energy Storage Time | ≤15 s |
| Heater Voltage | AC220V |
| Auxiliary Switch Rating | DC220V / AC220V |
| Auxiliary Switch Current | 10A |
| Auxiliary Contacts | 10 NO + 10 NC |
Mechanical Performance
| Item | Specification |
| Pole Center Distance | 3000–4000 mm |
| Total Contact Travel | 160 ±3 mm |
| Contact Stroke | 50 ±2 mm |
| Opening Speed | 3.0 ±0.5 m/s |
| Closing Speed | 9.0 ±1.5 m/s |
| Total Breaking Time | ≤60 ms |
| Close-Open Time | ≤80 ms |
| Open-Close Time | 300 ms |
| Three-Phase Opening Synchronization | ≤3 ms |
| Three-Phase Closing Synchronization | ≤5 ms |
Overall and mounting dimensions(mm)
Installation Requirements
The LW-252 Outdoor High Voltage SF6 Circuit Breaker is designed with clear installation requirements to ensure reliable mechanical performance and stable long-term operation.
Main installation parameters include:
- Total equipment weight: approximately 4500 kg (including 24 kg SF6 gas)
- Static foundation load: 4500 kg
- Dynamic horizontal load: 2500 kg
- Dynamic vertical upward load: 3500 kg
- Dynamic vertical downward load: 6000 kg
- Foundation level tolerance: ≤1.5 mm
The primary terminals are manufactured from 2A12-T4 aluminum alloy, with terminal hole drilling customized according to customer conductor requirements during installation, ensuring reliable electrical connection and convenient project integration.
Typical Applications
The LW-252 SF6 Circuit Breaker is widely applied in high-voltage transmission and substation projects, including:
- 220kV and 252kV transmission substations
- National power grid transmission systems
- Utility power substations
- Power generation facilities
- Renewable energy grid connection projects
- Extra-high-voltage transmission networks
- Industrial power distribution systems
- Substation expansion and modernization projects
With advanced SF6 interruption technology and reliable outdoor operating performance, the LW-252 provides an effective switching and protection solution for modern high-voltage power systems.
Why Choose the LW-252 SF6 Circuit Breaker?
The LW-252 Outdoor SF6 Circuit Breaker combines advanced technology, high reliability, and efficient operation for demanding transmission applications.
Key advantages include:
- Advanced 252kV SF6 self-blast arc-extinguishing technology
- Reliable interruption capability for high fault currents
- Independent spring operating mechanism for each pole
- High current carrying capability up to 4000A
- Excellent insulation performance for IEC Pollution Class IV environments
- Stainless steel operating cabinet with hot-dip galvanized support structure
- Long electrical and mechanical service life
- Compact outdoor structure with reduced maintenance requirements
- Ideal for transmission substations and extra-high-voltage power networks
Customization Services
We provide comprehensive OEM and project customization solutions to meet different transmission and substation requirements.
Available options include:
- Customized rated current configurations
- Auxiliary and control voltage selections
- Primary terminal arrangement customization
- Anti-seismic and enhanced corrosion protection solutions
- Compliance with international standards including IEC and GB
- Technical drawings, factory testing, and commissioning support
Contact us for quotations, technical documentation, and customized 252kV transmission and substation solutions.
