Product Overview
Insulation coordination is what allows a 252kV circuit breaker to sit energized, day after day, holding off the system voltage and its momentary overvoltages. The LW-252 outdoor SF6 circuit breaker is proven at a 460kV rated power-frequency withstand voltage to earth — with 460kV + 146kV specified across the fracture — demonstrating dielectric strength far beyond the stresses of normal 50Hz operation at 252kV.
That insulation platform carries the rest of a high-quality specification: 4000A rated current, 50kA short-circuit breaking and withstand currents, 125kA peak withstand, and high-speed SF6 interruption. The SF6 gas that quenches the arc is the same medium that maintains the dielectric strength between operations. Built as a 3-pole outdoor breaker under ISO9001-2000 certification in Zhejiang, China, it is a reliable choice for transmission substations where insulation margins are part of the specification.
Key Features
460kV power-frequency withstand voltage
Rated to withstand 460kV to earth at power frequency, and 460kV + 146kV across the open fracture — dielectric margins well above the 252kV system voltage.
SF6 insulation and arc extinguishing
Sulfur hexafluoride gas provides both the continuous insulation strength and the rapid arc-quenching capability that high voltage switching demands.
High quality 50kA fault current capability
A 50kA short-circuit breaking current with 50kA withstand and 125kA peak withstand ratings covers severe transmission fault duty.
4000A continuous current rating
The generous continuous rating supports heavily loaded 252kV circuits without thermal compromise.
Outdoor 3-pole installation
Engineered for permanent open-air installation in transmission switchyards, with a 3-pole configuration at 50Hz rated frequency.
Dependable manufacturing and support
ISO9001-2000 certified production, customization and OEM/ODM service, wooden-box packing, 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
- 252kV transmission substations with insulation coordination requirements
- High altitude or polluted sites needing proven dielectric margins
- Switching positions where open-fracture withstand is critical
- Transmission networks specified at 50kA fault levels
- New substations and breaker fleet renewal at the 220kV class
Frequently Asked Questions
What is the power-frequency withstand voltage of this breaker?
The rated power-frequency withstand voltage is 460kV to earth, and 460kV + 146kV across the fracture (between open contacts), as listed in the specification table.
Why does power-frequency withstand matter?
It proves the insulation system can hold off steady and momentary overvoltages at operating frequency, which is fundamental to safe, reliable long-term service at 252kV.
What fault ratings does the breaker carry?
It has a 50kA rated short-circuit breaking current, 50kA short-circuit withstand current, and 125kA rated peak withstand current.
What is the continuous current rating?
The rated current is 4000A at a rated voltage of 252kV and rated frequency of 50Hz.
Is the breaker certified and customizable?
Yes. Manufacturing is ISO9001-2000 certified, customization and OEM/ODM service are available, and each unit carries a 12-month warranty from HaiRui.
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 power-frequency withstand voltage of this breaker?
The rated power-frequency withstand voltage is 460kV to earth, and 460kV + 146kV across the fracture (between open contacts), as listed in the specification table.
Why does power-frequency withstand matter?
It proves the insulation system can hold off steady and momentary overvoltages at operating frequency, which is fundamental to safe, reliable long-term service at 252kV.
What fault ratings does the breaker carry?
It has a 50kA rated short-circuit breaking current, 50kA short-circuit withstand current, and 125kA rated peak withstand current.
What is the continuous current rating?
The rated current is 4000A at a rated voltage of 252kV and rated frequency of 50Hz.
Is the breaker certified and customizable?
Yes. Manufacturing is ISO9001-2000 certified, customization and OEM/ODM service are available, and each unit carries a 12-month warranty from HaiRui.
Request Quote
Tell us your specifications, quantity, or application scenario and we will reply with a tailored quote.
