Product Overview
The LW9-72.5 is an outdoor high-voltage sulfur hexafluoride (SF6) circuit breaker designed for 72.5kV power systems, featuring combined reclosing capability rated at 3150A. It uses SF6 gas as the arc-extinguishing medium and a spring operating mechanism for high-speed switching. The breaker is built for outdoor installation in substations and power distribution networks where reliable fault clearing and automatic reclosing are required.
Key Features
- Combined reclosing capability: Rated combined reactor current of 3150A supports auto-reclosing sequences for overhead line protection, reducing outage duration after transient faults.
- 40kA short-circuit breaking current: Interrupts fault currents up to 40kA with high-speed operation, protecting transformers, busbars, and downstream feeders from short-circuit damage.
- SF6 arc extinguishing: Sulfur hexafluoride gas provides efficient arc quenching with fast dielectric recovery, suited for outdoor high-voltage switching duty.
- 72.5kV rated voltage with 350kV lightning impulse withstand: Designed for 72.5kV systems with lightning impulse withstand of 350kV to earth and 350+60kV across the fracture, providing insulation coordination for overhead line and substation entry protection.
- 100kA peak withstand current: Withstands peak short-circuit currents of 100kA and 40kA for 3 seconds, ensuring mechanical and thermal stability during fault conditions.
- OEM/ODM customization: Parameters including rated current, voltage class, IP protection level, and operating mechanism can be adjusted to project specifications. Factory located in Wenzhou, Zhejiang, China.
- ISO9001-2000 certified manufacturing: Production follows ISO9001-2000 quality management standards. English manuals, test reports, certificates, and wiring diagrams are provided for customs clearance and commissioning.
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
Suitable for 72.5kV outdoor substations, power transmission line protection, and distribution networks requiring combined reclosing functionality. The breaker protects against short-circuit faults on overhead lines and cable circuits, and supports auto-reclosing sequences to restore supply after transient faults. Buyers should verify pole configuration, control voltage, and protection relay compatibility with their substation design.
Frequently Asked Questions
What is the combined reclosing current rating of the LW9-72.5?
The LW9-72.5 has a rated combined reactor current of 3150A and a cut back-to-back capacitor bank current of 4000A, supporting auto-reclosing operations for overhead line protection.
What is the rated short-circuit breaking current?
The rated short-circuit breaking current is 40kA, with a rated short-time withstand current of 40kA for 3 seconds and a rated peak withstand current of 100kA.
Is this circuit breaker suitable for outdoor installation?
Yes, the LW9-72.5 is designed for outdoor installation in high-voltage substations and power transmission networks.
What customization options are available?
OEM/ODM customization is supported for parameters including rated current, voltage class, IP protection level, size, and operating environment. Contact the manufacturer with your project specifications.
What documentation is provided with the breaker?
English operation manuals, ISO9001-2000 certificates, factory test reports, and wiring diagrams are included. These documents support customs clearance, installation, and commissioning.
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 combined reclosing current rating of the LW9-72.5?
The LW9-72.5 has a rated combined reactor current of 3150A and a cut back-to-back capacitor bank current of 4000A, supporting auto-reclosing operations for overhead line protection.
What is the rated short-circuit breaking current?
The rated short-circuit breaking current is 40kA, with a rated short-time withstand current of 40kA for 3 seconds and a rated peak withstand current of 100kA.
Is this circuit breaker suitable for outdoor installation?
Yes, the LW9-72.5 is designed for outdoor installation in high-voltage substations and power transmission networks.
What customization options are available?
OEM/ODM customization is supported for parameters including rated current, voltage class, IP protection level, size, and operating environment. Contact the manufacturer with your project specifications.
What documentation is provided with the breaker?
English operation manuals, ISO9001-2000 certificates, factory test reports, and wiring diagrams are included. These documents support customs clearance, installation, and commissioning.
Request Quote
Tell us your specifications, quantity, or application scenario and we will reply with a tailored quote.
