Product Overview
Lightning does not negotiate with insulation. A single strike near a 252kV line can drive a surge into the switchyard at megavolt scale, and the breaker must shrug it off. The LW-252 outdoor SF6 circuit breaker is proof-tested at a 1050kV rated lightning impulse withstand voltage to earth — with 1050kV + 206kV specified across the open fracture — giving transmission networks genuine protection margin against atmospheric surges.
The lightning resistance rests on precision manufacturing: controlled SF6 gas handling, accurately machined electrode geometry, and a split design that allows each pole column to be assembled and verified to tight tolerances. In service the same breaker delivers 4000A continuous current, 50kA short-circuit breaking and withstand, and 125kA peak withstand at 50Hz. Manufactured in Zhejiang, China under ISO9001-2000 certification with OEM/ODM service available, it is lightning-resistant protection for exposed transmission sites.
Key Features
1050kV lightning impulse withstand voltage
Rated to withstand 1050kV lightning impulse to earth, and 1050kV + 206kV across the open fracture, protecting against direct and induced atmospheric surges.
Precision manufacturing process
Accurate SF6 gas handling and tight-tolerance assembly give the insulation system the consistency that lightning impulse ratings demand.
Split design construction
The split design allows each section to be individually assembled, tested, and verified, reinforcing dielectric reliability at every pole column.
Complete fault duty coverage
50kA short-circuit breaking current, 50kA short-circuit withstand current, and 125kA making current peak and peak withstand current.
4000A continuous rating at 50Hz
High continuous current capacity for heavily loaded 252kV transmission circuits at the standard rated frequency.
Certified manufacturing with flexible terms
ISO9001-2000 certified production in Zhejiang, China, with customization, OEM/ODM service, MOQ of one piece, and a 12-month warranty.
Basic Info.
| Model NO. | LW-252 |
| Arc-extinguishing Medium | SF6 |
| Poles Number | 3 |
| Function | Circuit-Breaker Failure Protection, Overcurrent Protection |
| Product Name | Hv Sulfur Hexafluoride Circuit Breakers |
| MOQ | 1PCS |
| Customize | Yes |
| Rated Power-Frequency Withstand Voltage | to earth:460kv Fracture: 460+146kv |
| Rated Frequency | 50Hz |
| Rated Short-Circuit Breaking Current | 50ka |
| Rated Short-Circuit Withstand Current | 50ka |
| Transport Package | Wood Box |
| Trademark | HaiRui |
| Speed | High-Speed Circuit Breaker |
| Installation | Outdoor Installation |
| Type | Circuit Breaker |
| Certification | ISO9001-2000 |
| Service | OEM/ODM |
| Warranty | 12 Months |
| Rated Voltage | 252kv |
| Rated Lightning Impulse Withstand Voltag | to Earth:1050kv Fracture: 1050+206kv |
| Rated Current | 4000A |
| Rated Short-Circuit Making Current Peak | 125ka |
| Rated Peak Withstand Current | 125ka |
| Specification | Custom |
| Origin | Zhejiang,China |
Packaging & Delivery
| Package Size | 1.00cm*1.00cm*1.00cm |
| Package Gross Weight | 1.000kg |
Applications
- Transmission substations in lightning-prone regions
- Exposed 252kV switching positions with high surge exposure
- Overhead line terminations and corridor endpoint substations
- High-reliability transmission networks at the 220kV class
- Projects specifying 1050kV impulse insulation levels
Frequently Asked Questions
What is the lightning impulse withstand voltage?
The rated lightning impulse withstand voltage is 1050kV to earth and 1050kV + 206kV across the fracture, as listed in the specification table.
Why is lightning impulse resistance important for a 252kV breaker?
Atmospheric surges travel along transmission lines into the switchyard; the breaker’s insulation must withstand these steep-front impulses without flashover, both pole-to-earth and across open contacts.
What are the breaker’s current and fault ratings?
It is rated 4000A continuous current with a 50kA short-circuit breaking current, 50kA withstand current, and 125kA peak withstand current at 252kV.
How does precision manufacturing improve surge performance?
Tight-tolerance assembly and controlled SF6 gas handling produce a consistent insulation system, which is what allows the design to be proof-tested at full 1050kV impulse level.
What are the supply and warranty terms?
MOQ is one piece, customization and OEM/ODM service are available, and each breaker ships in a wooden box with a 12-month warranty.
Get a Quote
As an ISO9001-certified manufacturer based in Zhejiang, China, HaiRui supplies the LW-252 high voltage SF6 circuit breaker with flexible OEM/ODM service, customization support, and a 12-month warranty. Minimum order quantity is just one unit, and every breaker ships in a robust wooden export crate. Contact our engineering team with your ratings, altitude, and climate requirements for a detailed quotation and lead time.
FAQ
What is the lightning impulse withstand voltage?
The rated lightning impulse withstand voltage is 1050kV to earth and 1050kV + 206kV across the fracture, as listed in the specification table.
Why is lightning impulse resistance important for a 252kV breaker?
Atmospheric surges travel along transmission lines into the switchyard; the breaker's insulation must withstand these steep-front impulses without flashover, both pole-to-earth and across open contacts.
What are the breaker's current and fault ratings?
It is rated 4000A continuous current with a 50kA short-circuit breaking current, 50kA withstand current, and 125kA peak withstand current at 252kV.
How does precision manufacturing improve surge performance?
Tight-tolerance assembly and controlled SF6 gas handling produce a consistent insulation system, which is what allows the design to be proof-tested at full 1050kV impulse level.
What are the supply and warranty terms?
MOQ is one piece, customization and OEM/ODM service are available, and each breaker ships in a wooden box with a 12-month warranty.
Request Quote
Tell us your specifications, quantity, or application scenario and we will reply with a tailored quote.
