Customizable LW Series 10kKV 20KV 16KV 20KV 24KV 33KV 36KV Outdoor High Voltage SF6 Circuit Breakers – Product Overview

The LW3-12 Series represents a proven platform in outdoor high voltage SF6 circuit breakers, engineered by Zhejiang Jingyu Technology Co., Ltd. for protection and switching in 12kV medium-voltage distribution networks. When evaluating these customizable LW Series 10kKV 20KV 16KV 20KV 24KV 33KV 36KV outdoor high voltage SF6 circuit breakers for field deployment, the critical engineering question is not simply whether the rated specifications look adequate — it is whether the breaker sustains that performance reliably across many years of outdoor operation under variable environmental and load conditions. The LW3-12 platform is designed to answer that question with documented, verifiable engineering evidence backed by KEMA type testing and ISO 9001 quality management.

Core Architecture: Three-Phase Common-Tank SF6 Design

At the heart of the LW3-12 platform is its three-phase common-tank architecture. All three phases are housed in a hermetically sealed stainless steel tank filled with sulfur hexafluoride (SF6) gas at a rated pressure of 0.35 MPa at 20°C. SF6 serves as both the arc-extinguishing medium and the primary insulating medium, delivering dielectric strength and arc-quenching performance that surpasses air-blast and oil circuit breakers in the same voltage class. The self-energy rotary arc extinguishing principle minimizes contact erosion during breaking operations, contributing to a rated electrical life of 30 operations at full breaking current — a performance metric that holds consistently across the product's 10,000-operation mechanical life. The LW3-12 achieves an annual SF6 leakage rate of less than 0.05%, enabling maintenance-free operation cycles of 10 to 20 years.

Technical Parameters

SF6 Gas System

Three Operating Mechanism Configurations

These customizable LW Series 10kKV 20KV 16KV 20KV 24KV 33KV 36KV outdoor high voltage SF6 circuit breakers are available in three operating mechanism configurations, allowing engineers to precisely match automation and control requirements for each deployment:

• Type I – Manual Stored-Energy Spring Mechanism: Designed for basic rural distribution networks where remote electrical control is not a requirement. The spring stores energy for both opening and closing operations independently of external power. Operating sequence: O-180s-CO-180s-CO.
• Type II – Motor-Driven Stored-Energy Spring Mechanism: Supports local manual and remote electrical control via AC 220V or DC 220V motor (500W rated power, energy storage time ≤15 seconds). Provides 6NO+6NC auxiliary contacts for SCADA and distribution automation integration. Autoreclosing operating sequence O-0.3s-CO-180s-CO enables feeder protection reclosing applications.
• Type III – DC Electromagnetic Mechanism: Full distribution automation and smart grid integration capability. All three mechanism variants are factory-assembled and integrated into a compact self-contained pole unit, eliminating field mechanical coupling work during installation.

Key Features and Competitive Advantages

• Superior SF6 Arc Extinguishing: The self-energy rotary arc technology of these outdoor high voltage SF6 circuit breakers delivers consistent interruption from 25A cable charging current through 16kA or 20kA rated short-circuit breaking current. A higher voltage rating does not by itself guarantee superior reliability; the LW3-12's documented 30-operation electrical life at full current provides a measurable, comparable baseline for procurement evaluation.
• Hermetically Sealed, Maintenance-Free Operation: Annual SF6 leakage rate below 0.05%, verified by factory gas tightness testing. Over a 10-20 year operational cycle, this eliminates oil filtration schedules and vacuum integrity checks — in direct contrast to oil to water cooler maintenance requirements of oil circuit breakers. The sealing integrity holds under heavy rain, temperature cycling, and Class III/IV pollution environments.
• Compact Three-Phase Common-Tank Design: All three phases integrated in a single 1300 × 760 × 900 mm tank, weight 150-165 kg. Suitable for pole-mounted installation with simplified civil foundation requirements and lower transportation costs than independent-pole designs.
• Full Standards Compliance: Manufactured under ISO 9001, KEMA type-tested. Standards: IEC 62271-100, IEC 62271-1, GB 1984, GB/T 11022. Factory testing includes partial discharge tests, mechanical operation tests, and gas tightness verification. Type test certificates available for project qualification and approved vendor list submissions.

Applications

• 12kV Distribution Network Protection: These customizable LW Series 10kKV 20KV 16KV 20KV 24KV 33KV 36KV outdoor high voltage SF6 circuit breakers protect feeder lines from faults and overloads, supporting both urban and rural distribution grids. The Type II autoreclosing capability reduces outage duration from transient faults. In distribution automation architectures, the breaker's SCADA capability supports unified power flow controller strategies for reliable feeder-level switching.
• Substation Incoming and Outgoing Line Switching: Deployed as main switch or branch circuit protector in 12kV substations. In configurations including power transformers, protection coordination must account for transformer vector group characteristics. A complete transformer accessories list review alongside circuit breaker specification ensures relay setting compatibility across the substation assembly.
• Industrial and Mining Power Distribution: High breaking capacity and 10,000-operation mechanical life support arc furnace feeders, traction power supply, and demanding industrial applications. The sealed SF6 design eliminates the oil to water cooler servicing cycles required by oil-type alternatives, reducing total maintenance cost for continuous-operation facilities.

Commercial Terms

FAQ

1. What is the main function of SF6 circuit breaker in power transmission system?

It is the core protection and control equipment for high voltage transmission network. It can switch normal load current and automatically cut off short-circuit fault current to protect transformers and other power equipment.

2. What inspection work needs to be done for SF6 circuit breaker?

Regular inspection mainly focuses on gas density and equipment sealing condition, to keep the gas inside the tank within the specified working range.

3. Can your SF6 circuit breaker match GIS combination electrical equipment?

Yes, we can provide SF6 circuit breaker unit that can be integrated into GIS equipment according to your project design requirements.

4. What certifications do your SF6 circuit breakers have?

All our SF6 circuit breakers hold CE certification. CE related documents and product test reports are available for bidding and customs clearance.

5. What is your warranty commitment?

We provide 10 years warranty for all SF6 circuit breakers. Remote technical support is available for quality-related operation issues throughout the warranty period.