Product Overview
The LW8-40.5 outdoor SF6 circuit breaker is rated at 40.5kV with a 95kV power frequency withstand voltage and a 2000A rated current option (1600A also available). The power frequency insulation level supports dielectric coordination in distribution systems where sustained overvoltage conditions must be withstood without insulation failure. A spring operating mechanism provides high-speed fault clearing, and the breaker includes circuit-breaker failure protection and overcurrent protection functions.
Key Features
- 95kV power frequency withstand voltage: The insulation system withstands 95kV power frequency test voltage, providing margin against sustained overvoltages on 40.5kV networks and supporting insulation coordination with adjacent equipment.
- 2000A rated current capacity: The 2000A rating suits heavily loaded feeders and busbar sections; a 1600A option is available for lower-load applications.
- SF6 arc-extinguishing medium: Sulfur hexafluoride gas provides efficient arc quenching with fast dielectric recovery after current interruption, suited to repeated switching duty in outdoor installations.
- Spring operating mechanism: Spring-charged mechanism provides high-speed operation with mechanically stored energy, ensuring dependable tripping during fault conditions.
- Dual protection functions: Circuit-breaker failure protection and overcurrent protection functions are integrated, supporting secure system operation.
- 3000-operation mechanical lifespan: The mechanism is rated for 3000 mechanical operations, supporting extended service intervals in distribution duty.
- ISO9001-2000 certified with OEM/ODM support: Manufactured under ISO9001-2000 quality management with a 12-month warranty and customization available.
Product Attributes
| Customization | Available |
| Breaking Capacity | High Voltage Circuit Breakers |
| Operation | Spring Operating Mechanism |
| Model NO. | LW8-40.5 |
| Speed | High-Speed Circuit Breaker |
| Arc-extinguishing Medium | SF6 |
| Installaton | Outdoor Installation |
| Poles Number | 3 |
| Type | Circuit Breaker |
| Function | Circuit-Breaker Failure Protection, Overcurrent Protection |
| Certification | ISO9001-2000 |
| Product Name | Hv Sulfur Hexafluoride Circuit Breakers |
| Service | OEM/ODM |
| MOQ | 1PCS |
| Warranty | 12 Months |
| Customize | Yes |
| Rated Voltage | 40.5kv |
| Lightning Impulse Withstand Voltage | 40.5kv |
| Power Frequency Withstand Voltage | 95kv |
| Rated Current | 1600/2000A |
| Mechanical Lifespan | 3000time |
| Rated Gas Pressure of Sulfur Hexafluorid | 0.5MPa |
| Alarm Pressure | 0.47MPa |
| Minimum Functional Pressure | 0.15MPa |
| Transport Package | Wood Box |
| Specification | Custom |
| Trademark | HaiRui |
| Origin | Zhejiang,China |
| Package Size | 1.00cm*1.00cm*1.00cm |
| Package Gross Weight | 1.000kg |
Applications
Intended for 40.5kV outdoor distribution substations and industrial power systems where power frequency insulation coordination is a selection criterion – for example, networks with earth-fault overvoltage exposure or long cable feeders. The 2000A rating serves high-load feeders. Buyers should verify the required insulation levels against their system’s overvoltage study and confirm the rated current matches feeder loading.
Frequently Asked Questions
What is the power frequency withstand voltage?
The rated power frequency withstand voltage is 95kV. This defines the insulation level of the breaker under sustained alternating overvoltage conditions on the 40.5kV system.
Which rated current should I choose, 1600A or 2000A?
Choose the rating based on the continuous load current of the circuit being protected, including a margin for load growth. The 2000A rating suits heavily loaded feeders; 1600A suits standard distribution loading.
How does power frequency insulation level affect equipment selection?
The 95kV power frequency withstand voltage must coordinate with the insulation levels of transformers, cables, and surge arresters in the same system to prevent insulation failure during overvoltage events.
What operating mechanism does the breaker use?
A spring operating mechanism with high-speed operation. Tripping energy is stored mechanically, so fault clearing does not depend on auxiliary power availability at the trip instant.
Can the breaker be customized for my system?
Yes. OEM/ODM customization is available with ISO9001-2000 certification and a 12-month warranty. Contact HaiRui with your system voltage, load current, and insulation coordination requirements.
Get a Quote
To request a quotation for the LW8-40.5 2000A SF6 circuit breaker, contact HaiRui with your system voltage, required rated current, insulation coordination requirements, and order quantity.
FAQ
What is the power frequency withstand voltage?
The rated power frequency withstand voltage is 95kV. This defines the insulation level of the breaker under sustained alternating overvoltage conditions on the 40.5kV system.
Which rated current should I choose, 1600A or 2000A?
Choose the rating based on the continuous load current of the circuit being protected, including a margin for load growth. The 2000A rating suits heavily loaded feeders; 1600A suits standard distribution loading.
How does power frequency insulation level affect equipment selection?
The 95kV power frequency withstand voltage must coordinate with the insulation levels of transformers, cables, and surge arresters in the same system to prevent insulation failure during overvoltage events.
What operating mechanism does the breaker use?
A spring operating mechanism with high-speed operation. Tripping energy is stored mechanically, so fault clearing does not depend on auxiliary power availability at the trip instant.
Can the breaker be customized for my system?
Yes. OEM/ODM customization is available with ISO9001-2000 certification and a 12-month warranty. Contact HaiRui with your system voltage, load current, and insulation coordination requirements.
Request Quote
Tell us your specifications, quantity, or application scenario and we will reply with a tailored quote.
