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LW-252 Outdoor High Voltage AC SF6 Circuit Breaker
Product Overview
The LW-252 Outdoor High Voltage AC SF₆ Circuit Breaker is designed for 252kV, 50Hz AC transmission systems, providing reliable switching, protection, and control for high-voltage power networks. It is capable of interrupting rated load currents, overload currents, and short-circuit fault currents while performing transmission line switching and substation interconnection duties.
Using SF₆ (Sulfur Hexafluoride) as both the insulating and arc-extinguishing medium, the breaker incorporates advanced self-energy arc-quenching technology and a high-performance spring operating mechanism. Compared with conventional circuit breakers, it offers longer electrical life, lower operating energy consumption, quieter operation, and exceptional reliability.
With its compact structure, maintenance-free design, and outstanding insulation performance, the LW-252 is an ideal replacement for imported high-voltage SF₆ circuit breakers used in modern transmission substations.
Operating Environment
Maximum System Voltage: 252kV
Rated Frequency: 50Hz
Installation: Outdoor
Maximum Altitude: ≤ 2,000 m
Ambient Temperature: Down to -30°C
Pollution Level: IEC Class IV
Model Designation
| Code | Description |
|---|---|
| L | SF₆ Circuit Breaker |
| W | Outdoor Type |
| □ | Design Code |
| 252 | Rated Voltage (252kV) |
| W | Anti-Pollution Type |
| T | Spring Operating Mechanism |
| 4000 | Rated Current (4000A) |
| 50 | Rated Short-Circuit Breaking Current (50kA) |
Key Features
Advanced SF₆ Self-Blast Arc Interruption Technology
The LW-252 adopts an advanced self-energy (self-blast) arc extinguishing system, utilizing the excellent dielectric and arc-quenching properties of SF₆ gas.
Benefits include:
Superior short-circuit interruption capability
Long electrical endurance
No restrike during fault interruption
Reduced operating energy
Stable interruption performance
High-Performance Spring Operating Mechanism
Each pole is equipped with an independent spring operating mechanism while maintaining synchronized three-phase operation.
Advantages include:
Fast opening and closing response
High mechanical reliability
Low operating power consumption
Suitable for frequent switching operations
Long maintenance intervals
Excellent Insulation Performance
The breaker is designed with long creepage porcelain insulators for harsh environmental conditions.
Features include:
SF₆ gas insulation
IEC Pollution Class IV capability
Excellent resistance to contamination
Reliable operation in coastal and industrial environments
High lightning withstand performance
An integrated density relay continuously monitors SF₆ gas density and pressure to ensure reliable insulation throughout the service life.
High Current Carrying Capacity
The LW-252 is designed with generous thermal margins.
Features include:
Rated current up to 4000A
Continuous operation at 120% rated current (4800A)
Excellent temperature rise performance
Low contact resistance
Stable long-term operation
Corrosion-Resistant Construction
Designed for decades of outdoor service, the breaker incorporates premium corrosion protection.
Construction highlights:
Stainless steel operating mechanism cabinet
Hot-dip galvanized support structures
Corrosion-resistant fasteners
Weatherproof enclosure
Long service life with minimal maintenance
Compact Design & Easy Installation
The three-pole single-break structure minimizes installation space while simplifying commissioning and maintenance.
Benefits include:
Compact overall dimensions
Easy transportation
Simple field installation
Reduced maintenance workload
Convenient inspection access
Technical Specifications
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 |
Installation Requirements
Total 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
Primary terminals are manufactured from 2A12-T4 aluminum alloy, with terminal holes drilled according to customer conductor specifications during installation.
Typical Applications
The LW-252 SF₆ Circuit Breaker is widely used in:
220kV and 252kV transmission substations
National power grid transmission systems
Utility substations
Power generation plants
Renewable energy grid connection projects
Extra-high-voltage transmission networks
Industrial power distribution systems
Substation expansion and modernization projects
Why Choose the LW-252 SF₆ Circuit Breaker?
Advanced 252kV SF₆ self-blast interruption technology
Reliable interruption of heavy fault currents
Independent spring operating mechanism for each pole
High-current capacity up to 4000A
Excellent insulation performance for Pollution Class IV environments
Stainless steel cabinet with hot-dip galvanized steel structure
Long electrical and mechanical service life
Compact, low-maintenance outdoor design
Ideal for transmission substations and extra-high-voltage power systems
Custom Service
We provide complete OEM and project customization services, including:
Rated current options
Auxiliary and control voltage configurations
Terminal arrangement customization
Anti-seismic and anti-corrosion upgrades
International standards (IEC/GB) compliance
Technical drawings, factory testing, and commissioning support
Contact us for quotations, technical documentation, and customized solutions for your transmission and substation projects.
Contact Us
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