Product Overview
The LW8-40.5 outdoor SF6 circuit breaker operates with a 0.5MPa rated SF6 gas pressure, monitored through a defined pressure management scheme: alarm pressure at 0.47MPa provides early warning of gas loss, and the 0.15MPa minimum functional pressure defines the lower limit for safe interrupting performance. This graduated pressure framework supports gas condition monitoring in unmanned outdoor installations. Rated at 40.5kV with 1600A or 2000A current options, the breaker uses a spring operating mechanism with high-speed fault clearing.
Key Features
- 0.5MPa rated SF6 gas pressure: The breaker’s interrupter is designed to operate at 0.5MPa rated gas pressure, the reference condition for its insulating and arc-extinguishing performance.
- 0.47MPa alarm pressure: The alarm pressure setting provides early warning of gas leakage before performance is affected, allowing scheduled maintenance response rather than emergency outage.
- 0.15MPa minimum functional pressure: Below minimum functional pressure the breaker’s interrupting capability can no longer be guaranteed; this defined limit supports lockout logic and safe operating procedures in gas monitoring systems.
- 40.5kV rated voltage, 1600/2000A current: Two rated current options cover different feeder loads on 40.5kV distribution networks, with 95kV power frequency withstand voltage.
- Spring operating mechanism: Spring-charged high-speed operation with mechanically stored tripping energy for dependable fault clearing.
- Circuit-breaker failure and overcurrent protection: Integrated protection functions support system security, complementing gas pressure supervision in overall breaker monitoring.
- ISO9001-2000 certified with OEM/ODM support: Manufactured under ISO9001-2000 quality management with a 12-month warranty, MOQ of 1 piece, 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
Suited to 40.5kV outdoor distribution substations where SF6 gas condition monitoring is part of asset management practice – particularly unmanned or remotely supervised installations. The defined alarm and minimum functional pressure thresholds support integration with gas density monitoring and lockout schemes. Buyers should confirm rated current (1600A or 2000A) and specify gas monitoring requirements compatible with their supervisory systems.
Frequently Asked Questions
What is the rated SF6 gas pressure?
The rated gas pressure of sulfur hexafluoride is 0.5MPa. This is the design pressure at which the breaker’s insulation and interrupting performance ratings apply.
What happens if gas pressure drops?
An alarm is triggered at 0.47MPa, providing early warning of gas loss while performance margin remains. At 0.15MPa – the minimum functional pressure – interrupting capability can no longer be guaranteed and the breaker should be removed from service for inspection and refilling.
How is gas pressure monitored in service?
Gas pressure or density monitoring devices track SF6 condition and can be integrated with substation supervisory systems. The defined 0.47MPa alarm and 0.15MPa minimum functional thresholds support monitoring logic and lockout schemes.
What are the breaker’s electrical ratings?
Rated voltage is 40.5kV with 1600A or 2000A rated current options and 95kV power frequency withstand voltage. See the product attributes table for the full rating list.
Is gas pressure monitoring equipment included or customizable?
OEM/ODM customization is available for monitoring configurations and other parameters. Contact HaiRui with your supervisory system requirements for a tailored solution.
Get a Quote
To request a quotation for the LW8-40.5 0.5MPa rated gas pressure SF6 circuit breaker, contact HaiRui with your rated voltage, current requirement, gas monitoring requirements, and order quantity.
FAQ
What is the rated SF6 gas pressure?
The rated gas pressure of sulfur hexafluoride is 0.5MPa. This is the design pressure at which the breaker's insulation and interrupting performance ratings apply.
What happens if gas pressure drops?
An alarm is triggered at 0.47MPa, providing early warning of gas loss while performance margin remains. At 0.15MPa - the minimum functional pressure - interrupting capability can no longer be guaranteed and the breaker should be removed from service for inspection and refilling.
How is gas pressure monitored in service?
Gas pressure or density monitoring devices track SF6 condition and can be integrated with substation supervisory systems. The defined 0.47MPa alarm and 0.15MPa minimum functional thresholds support monitoring logic and lockout schemes.
What are the breaker's electrical ratings?
Rated voltage is 40.5kV with 1600A or 2000A rated current options and 95kV power frequency withstand voltage. See the product attributes table for the full rating list.
Is gas pressure monitoring equipment included or customizable?
OEM/ODM customization is available for monitoring configurations and other parameters. Contact HaiRui with your supervisory system requirements for a tailored solution.
Request Quote
Tell us your specifications, quantity, or application scenario and we will reply with a tailored quote.
