Overview of LW3-12 series

The LW3-12 and LW3-12G III III series outdoor high-voltage sulfur hexafluoride (SF6) circuit breakers are high-performance electrical equipment designed for outdoor use. These breakers utilize SF6 gas as the arc-extinguishing and insulating medium, offering exceptional reliability and efficiency. The series features a modular design and can be equipped with various operating mechanisms, including the manual spring operating mechanism (Type I), motorized spring operating mechanism (Type II), and direct current magnetic operating mechanism (Type III). This integration results in a compact and fully functional unit.

Compared to other 10kV-level outdoor circuit breakers, the LW3 series stands out for its simple structure, superior arc-extinguishing capability, and excellent insulation performance. It also features low operating effort, high-rated parameters, extended service life, and minimal maintenance requirements. Its space-saving design reduces installation footprints, lowers project costs, and eliminates fire hazards, significantly enhancing the safety and reliability of power systems.

Type Designation for LW3-12 series Vacuum Circuit Breaker

The model naming convention for LW3 series outdoor SF6 circuit breakers is as follows:

• L: Uses SF6 gas as the arc-extinguishing and insulating medium.
• W: Outdoor type, suitable for outdoor installations.
• 3: Series design number.
• 12: Rated voltage (kV).
• I / II / III: Operating mechanism types:
  • I: Manual spring.
  • II: Motorized spring (AC).
  • III: Magnetic (DC).
• 400/630: Rated current (A).
• 6.3 / 8 / 12.5 / 16: Rated short-circuit breaking current (kA).

This structured model ensures easy identification and application-specific selection.

Features of LW3 Outdoor High-Voltage SF6 Circuit Breakers

1.  Reliable Performance in Power Systems: Perfectly designed for opening and closing load currents and overload currents in power systems with a rated voltage of 12kV, 630A rated current, and 50/60Hz frequency. Ensures automatic isolation of faulted distribution line sections, maintaining operational stability and reducing downtime.

2. Customizable Insulation Solutions: Standard ceramic bushings are included for durability and reliability. Flexible options like rubber insulators and epoxy bushings are available to meet specific operational and environmental needs.

3. Fast and Efficient Operating Mechanism: Features a spring-loaded energy storage mechanism that guarantees fast closing and breaking operations in less than 110ms, enabling quick response during faults or operational adjustments.

4. Advanced Control Technology: Includes a standby electronic controller for seamless local operation and integration with remote systems through FTU/RTU interfaces. Ideal for modern automated power distribution networks.

5. Robust, Corrosion-Resistant Construction:  Built with 304L stainless steel, commonly used in warships, ensuring exceptional durability and resistance to harsh environments.

6. Superior Arc-Extinguishing and Insulating Medium: Utilizes SF6 gas, known for its non-toxic, non-flammable properties and outstanding arc-extinguishing capabilities. Every switch is factory-filled, sealed, and tested to strict international standards (IEC60265-1(1988), GB3804-1990) for consistent safety and performance.

Technical Parameters of LW3 High-Voltage SF6 Circuit Breakers

Item		Unit	Data
Rated Voltage		kV	12
Maximum Operating Voltage		kV	12
Rated Insulation Level
– Lightning Impulse Withstand Voltage (peak)		kV	75
– 1-Minute Power Frequency Withstand Voltage		kV	42
– Wet Power Frequency Test		kV	34
– Interphase Impulse Withstand Voltage		kV	85
Zero Sequence Insulation Level
– 1-Minute Power Frequency		kV	30
– Interphase Power Frequency		kV	30
– Maximum Operating Voltage (5 Minutes)		kV	12
Rated Current		A	400, 630
Rated Short-Circuit Breaking Current		kA	6.3, 8, 12.5
Zero Sequence Breaking Current		A	400, 630
Rated Operating Sequence	– Type I		O–180s–CO–180s–CO
	– Type II		O–0.3s–CO–180s–CO
Rated Closing Current (peak)		kA	16, 20, 31.5
Rated Stable Current (peak)		kA	16, 20, 31.5
Rated Thermal Current		kA	6.3, 8, 12.5
Rated Thermal Duration		s	4

Installation and Maintenance

Note:

This detailed product description provides comprehensive information about the LW3-12 Series Outdoor High-Voltage SF6 Circuit Breaker, including its features, specifications, and applications. For specific customization needs, such as unique configurations, non-standard operating conditions, or enhanced functionalities, please feel free to contact our technical team. We are dedicated to providing tailored solutions to meet your precise requirements.

For inquiries or orders, don’t hesitate to reach out. Our team is ready to assist you with the best products and services tailored to your power distribution needs.

Technical FAQs for LW3-12 Series SF6 Circuit Breakers

• What applications is the LW3-12 Series breaker designed for?
  It is ideal for 12kV outdoor high-voltage power systems, including urban grids, industrial facilities, and automated power distribution networks.
• How does the LW3-12 ensure reliability in harsh environments?
  The breaker features 304L stainless steel construction and sealed SF6 gas insulation, providing excellent resistance to corrosion, extreme temperatures, and humidity.
• What are the available operating mechanisms for the LW3-12?
  The breaker offers manual spring (Type I), motorized spring (Type II), and magnetic DC (Type III) operating mechanisms for diverse operational requirements.
• What is the rated short-circuit breaking capacity of the LW3-12 breaker?
  The breaker supports short-circuit breaking currents of 6.3kA, 8kA, and 12.5kA, ensuring reliable fault management.
• Can the LW3-12 be integrated into automated power grids?
  Yes, it includes advanced FTU/RTU interfaces for remote operation, monitoring, and seamless integration with smart grid systems.
• What maintenance is required for the LW3-12 breaker?
  With factory-sealed SF6 gas and robust construction, the breaker requires minimal maintenance, reducing operational costs and downtime.

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