Product Overview
The decisive test of a high voltage circuit breaker is what happens at maximum fault current — and the LW36-126 answers with a 40kA short-circuit breaking capacity. When a bolted fault strikes a 126kV network, this breaker interrupts the full 40kA current using SF6 arc-extinguishing technology, then stands ready for the next operation. For substations specified around 40kA fault levels, it is a premium primary breaker that matches the network’s worst-case design current.
The breaking capability is supported by a matched structure: 3150A rated current for continuous load, 40kA/3s short-time withstand for delayed clearing sequences, and a high-speed operating mechanism that opens the contacts without hesitation. The 3-pole outdoor design installs directly in open-air switchyards, while ISO9001-2000 certified production, customization, and OEM/ODM service keep the specification flexible for utility and industrial buyers alike.
Key Features
40kA short-circuit breaking capacity
Interrupts the maximum specified fault current cleanly using SF6 gas, matching networks designed around 40kA fault levels.
40kA/3s withstand for complete fault sequences
If clearing is delayed by protection coordination, the breaker carries the fault current for up to three seconds without damage.
Premium high-speed operating mechanism
Classified as a high-speed circuit breaker, opening decisively to minimize fault energy delivered to the network.
3150A continuous current capability
High continuous load capacity complements the breaking rating, covering both normal flow and fault duty without compromise.
Outdoor 3-pole SF6 construction
Three poles with SF6 insulation and arc quenching, engineered for permanent outdoor installation in 126kV switchyards.
Certified, flexible supply
Manufactured under ISO9001-2000 certification in Zhejiang, China, with customization, OEM/ODM service, MOQ of one piece, and 12-month warranty.
Basic Info.
| Model NO. | LW36-126 |
| Arc-extinguishing Medium | SF6 |
| Poles Number | 3 |
| Function | Circuit-Breaker Failure Protection, Overcurent Protection |
| Product Name | Hv Sulfur Hexafluoride Circuit Breakers |
| MOQ | 1PCS |
| Customize | Yes |
| Rated Frequency | 52Hz |
| Rated Short-Circuit Breaking Current | 40ka |
| Transport Package | Wood Box |
| Trademark | HaiRui |
| Speed | High-Speed Circuit Breaker |
| nstallation | Outdoor Installation |
| Type | Circuit Breaker |
| Cetification | ISO9001-2000 |
| Service | OEM/ODM |
| Warranty | 12 Months |
| Rated Voltage | 126kv |
| Rated Current | 3150A |
| Rated Short-Time Withstand Current/Durat | 40/3ka/S |
| Specification | Custom |
| Origin | Zhejiang,China |
Packaging & Delivery
| Package Size | 1.00cm*1.00cm*1.00cm |
| Package Gross Weight | 1.000kg |
Applications
- 126kV substations specified at 40kA fault level
- Transmission breaker positions with maximum fault duty
- Strong-grid interconnection points with high short-circuit power
- Substation projects requiring premium breaking margins
- Replacement of under-rated breakers in fault-level studies
Frequently Asked Questions
What is the short-circuit breaking capacity of this breaker?
The LW36-126 has a rated short-circuit breaking current of 40kA, together with a 40kA/3s rated short-time withstand current.
Why choose a 40kA breaker?
Networks with high short-circuit power require breakers whose breaking capacity meets or exceeds the calculated maximum fault current; 40kA coverage provides margin for strong grids at 126kV.
What are the other key ratings?
Rated voltage is 126kV, rated current is 3150A, rated frequency is 52Hz, and the breaker operates at high speed using SF6 arc extinguishing.
Is the breaker suitable for outdoor substations?
Yes. It is an outdoor installation type with a 3-pole configuration, designed for open-air switchyard service.
What service and certification are provided?
HaiRui offers OEM/ODM service and customization from an ISO9001-2000 certified factory, with MOQ of one piece, wooden-box packing, and a 12-month warranty.
Get a Quote
As an ISO9001-certified manufacturer based in Zhejiang, China, HaiRui supplies the LW36-126 high voltage SF6 circuit breaker with flexible OEM/ODM service, customization support, and a 12-month warranty. Minimum order quantity is just one unit, and every breaker ships in a robust wooden export crate. Contact our engineering team with your ratings, altitude, and climate requirements for a detailed quotation and lead time.
FAQ
What is the short-circuit breaking capacity of this breaker?
The LW36-126 has a rated short-circuit breaking current of 40kA, together with a 40kA/3s rated short-time withstand current.
Why choose a 40kA breaker?
Networks with high short-circuit power require breakers whose breaking capacity meets or exceeds the calculated maximum fault current; 40kA coverage provides margin for strong grids at 126kV.
What are the other key ratings?
Rated voltage is 126kV, rated current is 3150A, rated frequency is 52Hz, and the breaker operates at high speed using SF6 arc extinguishing.
Is the breaker suitable for outdoor substations?
Yes. It is an outdoor installation type with a 3-pole configuration, designed for open-air switchyard service.
What service and certification are provided?
HaiRui offers OEM/ODM service and customization from an ISO9001-2000 certified factory, with MOQ of one piece, wooden-box packing, and a 12-month warranty.
Request Quote
Tell us your specifications, quantity, or application scenario and we will reply with a tailored quote.
