Product Overview
The LW9-72.5 is an outdoor porcelain column type high-voltage SF6 circuit breaker rated at 72.5kV and 4000A. The porcelain column structure provides the insulation clearance and mechanical support required for outdoor high-voltage installation, while SF6 gas handles arc extinguishing during fault interruption. The spring operating mechanism ensures high-speed switching for substation protection applications.
Key Features
- Porcelain column structure: The porcelain column design provides the external insulation and mechanical strength needed for outdoor 72.5kV installations, supporting the interrupter assembly at the required clearance height above ground.
- 72.5kV rated voltage: Designed for 72.5kV high-voltage systems, with power frequency withstand of 160kV to earth and lightning impulse withstand of 350kV to earth for system insulation coordination.
- 4000A rated current: Continuous current capacity of 4000A supports heavy-load circuits in transmission and distribution substations without current derating.
- 40kA short-circuit breaking: Interrupts fault currents up to 40kA, with 100kA peak withstand and 40kA for 3 seconds short-time withstand, protecting busbars and transformers from fault damage.
- SF6 arc-extinguishing medium: Sulfur hexafluoride gas provides fast dielectric recovery after arc interruption, suited for outdoor high-voltage switching duty.
- Spring operating mechanism: Spring-charged mechanism delivers consistent high-speed contact separation, minimizing arc duration and fault damage during operation.
- OEM/ODM and ISO9001-2000: Customization is available for rated current, voltage, IP level, and dimensions. Manufacturing follows ISO9001-2000 standards with full documentation including English manuals and test reports.
Basic Info.
| Model NO. | LW9-72.5 |
| Arc-extinguishing Medium | SF6 |
| Structure | Other |
| Type | Circuit Breaker |
| Certification | ISO9001-2000 |
| Service | OEM/ODM |
| Warranty | 12 Months |
| Rated Voltage | 72.5kv |
| Rated Short-Time Withstand Current | 40ka(3s) |
| Rated Peak Withstand Current | 100ka |
| Cut Back-to-Back Capacitor Bank Curr | 4000A |
| Rated 1 Min Power Frequency Withstand Vo | Fracture:160+42kv to Earth:160kv |
| Specification | Custom |
| Origin | Zhejiang,China |
| Speed | High-Speed Circuit Breaker |
| nstallation | Outdoor Installation |
| Poles Number | Other |
| Function | Circuit-Breaker Failure Protection |
| Product Name | Hv Sulfur Hexafluoride Circuit Breakers |
| MOQ | 1PCS |
| Customize | Yes |
| Rated Current | 4000A |
| Rated Short-Circuit Breaking Current | 40ka |
| Rated Lightning Impulse Withstand Voltag | Fracture:350+60kv to Eath:350kv |
| Cut Combined Reactor Current | 3150A |
| Transport Package | Wood Box |
| Trademark | HaiRui |
Packaging & Delivery
| Package Size | 1.00cm*1.00cm*1.00cm |
| Package Gross Weight | 1.000kg |
Applications
Used in 72.5kV outdoor substations for transmission line protection, transformer protection, and busbar coupling. The porcelain column structure suits installations where external insulation and mechanical height clearance are required. Buyers should confirm the substation layout, foundation design, and porcelain creepage distance requirements for their environmental conditions (pollution level, altitude, humidity).
Frequently Asked Questions
What type of structure does the LW9-72.5 use?
The LW9-72.5 uses a porcelain column structure, which provides external insulation and mechanical support for outdoor 72.5kV high-voltage installation.
What is the rated voltage and current?
The rated voltage is 72.5kV and the rated current is 4000A. The breaker also has a rated short-circuit breaking current of 40kA.
What insulation levels does the breaker meet?
The lightning impulse withstand voltage is 350kV to earth (350+60kV across fracture), and the 1-minute power frequency withstand voltage is 160kV to earth (160+42kV across fracture).
Can the porcelain column specifications be customized?
OEM/ODM customization is available for parameters including rated current, voltage class, IP protection level, and working environment. The manufacturer can adjust the design for specific pollution levels and altitude conditions.
What is the warranty period?
The warranty period is 12 months. The manufacturer is located in Wenzhou, Zhejiang, China, and provides 24-hour English-language technical support.
Get a Quote
To request a quotation or discuss customization for the LW9-72.5 SF6 circuit breaker, contact HaiRui with your project specifications including rated voltage, current requirements, fault current levels, installation environment, and quantity needed.
FAQ
What type of structure does the LW9-72.5 use?
The LW9-72.5 uses a porcelain column structure, which provides external insulation and mechanical support for outdoor 72.5kV high-voltage installation.
What is the rated voltage and current?
The rated voltage is 72.5kV and the rated current is 4000A. The breaker also has a rated short-circuit breaking current of 40kA.
What insulation levels does the breaker meet?
The lightning impulse withstand voltage is 350kV to earth (350+60kV across fracture), and the 1-minute power frequency withstand voltage is 160kV to earth (160+42kV across fracture).
Can the porcelain column specifications be customized?
OEM/ODM customization is available for parameters including rated current, voltage class, IP protection level, and working environment. The manufacturer can adjust the design for specific pollution levels and altitude conditions.
What is the warranty period?
The warranty period is 12 months. The manufacturer is located in Wenzhou, Zhejiang, China, and provides 24-hour English-language technical support.
Request Quote
Tell us your specifications, quantity, or application scenario and we will reply with a tailored quote.
