Product Overview
The LW9-72.5 is an outdoor high-voltage SF6 circuit breaker rated at 4000A with a 40kA short-circuit breaking current for 72.5kV power systems. Its high breaking capacity and spring operating mechanism enable fast fault interruption, protecting substation equipment from short-circuit damage. The SF6 arc-extinguishing medium provides reliable switching performance in outdoor environments.
Key Features
- 4000A rated current: Continuous current rating of 4000A supports heavy-load feeder and transformer protection circuits in 72.5kV substations without derating.
- 40kA short-circuit breaking capacity: Interrupts fault currents up to 40kA at high speed, clearing short-circuit faults on busbars, transformers, and transmission lines before equipment damage occurs.
- SF6 gas arc extinguishing: Sulfur hexafluoride provides fast dielectric recovery after arc interruption, suited for repeated switching duty in outdoor installations.
- Spring operating mechanism: Stores and releases mechanical energy for high-speed contact separation, ensuring consistent breaking performance across operating cycles.
- 160kV power frequency withstand: Rated 1-minute power frequency withstand voltage of 160kV to earth and 160+42kV across the fracture, providing insulation margin for 72.5kV system voltage.
- OEM/ODM customization: Rated current, voltage, IP level, and dimensional parameters can be tailored to project requirements. Manufacturing follows ISO9001-2000 standards in Wenzhou, Zhejiang, China.
- Comprehensive technical support: 24-hour English-language response via email, WhatsApp, and Skype. On-site engineer dispatch is available for commissioning and troubleshooting support.
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
Designed for 72.5kV outdoor substations, power transmission line terminals, and industrial power distribution systems requiring high-current circuit protection. The 4000A continuous rating suits applications with heavy load currents, and the 40kA breaking capacity handles substantial fault levels. Buyers should confirm the system’s maximum fault current, protection relay type, and control voltage before ordering.
Frequently Asked Questions
What is the rated current of the LW9-72.5 circuit breaker?
The rated current is 4000A, suitable for continuous operation at full load in 72.5kV substations and power transmission systems.
What is the short-circuit breaking capacity?
The rated short-circuit breaking current is 40kA. The breaker also withstands 40kA for 3 seconds (short-time) and 100kA peak (peak withstand current).
What arc-extinguishing medium does this breaker use?
The LW9-72.5 uses sulfur hexafluoride (SF6) gas as the arc-extinguishing medium, providing efficient arc quenching and fast dielectric recovery.
Can the breaker parameters be customized?
Yes, OEM/ODM customization is available for rated current, voltage class, IP protection level, dimensions, and operating environment. Provide your specifications for a tailored solution.
What is the minimum order quantity?
The minimum order quantity is 1 piece. Customization is available for all orders. Contact the manufacturer for pricing and lead time based on your project requirements.
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 is the rated current of the LW9-72.5 circuit breaker?
The rated current is 4000A, suitable for continuous operation at full load in 72.5kV substations and power transmission systems.
What is the short-circuit breaking capacity?
The rated short-circuit breaking current is 40kA. The breaker also withstands 40kA for 3 seconds (short-time) and 100kA peak (peak withstand current).
What arc-extinguishing medium does this breaker use?
The LW9-72.5 uses sulfur hexafluoride (SF6) gas as the arc-extinguishing medium, providing efficient arc quenching and fast dielectric recovery.
Can the breaker parameters be customized?
Yes, OEM/ODM customization is available for rated current, voltage class, IP protection level, dimensions, and operating environment. Provide your specifications for a tailored solution.
What is the minimum order quantity?
The minimum order quantity is 1 piece. Customization is available for all orders. Contact the manufacturer for pricing and lead time based on your project requirements.
Request Quote
Tell us your specifications, quantity, or application scenario and we will reply with a tailored quote.
