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Pole-Mounted SF6 Load Break Switch (LBS)

Pole-Mounted SF6 Load Break Switch (LBS)

POLE-MOUNTED SWITCH

Pole-Mounted SF6 Load Break Switch (LBS), LWF3 Series

The LWF3 series pole-mounted SF6 load break switch is a tank-type, gas-insulated switching device designed for medium-voltage overhead distribution lines. It uses SF6 gas as both the insulating and arc-extinguishing medium, enabling the switch to break load current and make fault current. Available in 12 kV, 17.5 kV, 24 kV, and 38 kV ratings, this load break switch is suitable for conventional overhead lines and overhead lines with insulated conductors. It is especially suitable for modern remote-controlled distribution automation systems.

Designed as a maintenance-free pole-mounted switch, this load break switch provides reliable outdoor operation in demanding environments, including high salt spray, corrosive industrial pollutants, snow, and ice. With a 30-year design life, the switch can be configured with high-precision zero-sequence and phase current sensors, as well as phase and zero-sequence voltage sensors. It also supports a primary/secondary isolation design, helping improve intelligent monitoring and fault diagnosis in automated distribution networks.

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Features

Rotating Arc Interruption:

The switch uses the electromagnetic force generated by current flowing through the main circuit to extinguish the arc. This design provides arc-extinguishing force in proportion to the current level.

Sealing Technology:

The enclosure is formed using a 1,300-times pneumatic-hydraulic expansion forming process. Its round cross-section improves resistance to both internal and external pressure. Robotic welding helps ensure consistent enclosure accuracy and quality, while high-density sealing materials provide long-term sealing reliability under harsh conditions, including high pressure and corrosive environments.

Safety Design:

The switch is designed to maintain opening, closing, and breaking performance even under reduced gas-tightness conditions. It is also equipped with a pressure indicator for abnormal pressure conditions.

Friction Crimping:

The electrode connection uses a friction-pressed connection process to improve joint strength and ensure stable connection quality.

Intelligent Monitoring and Functional Adaptability:

The switch can be equipped with built-in high-precision current and voltage sensors. It supports remote operation and can be integrated into remote-controlled distribution automation systems. When used with a controller, it supports automatic fault detection and includes an explosion-proof pressure relief device.

Technical parameters:

Parameter		LWF3-12			LWF3-17.5			LWF3-24			LWF3-38
Rated voltage (kV)		12 (GB voltage standard)			17.5 (SDMS voltage standard)			24 (GB voltage standard)			38 (SDMS voltage standard)
Rated frequency (Hz)		50/60
Rated current (A)		400	630		400	630		400	630		400	630
Rated short-time withstand current / duration (kA/s)		20/3			21/1			20/3			25/1
Rated peak withstand current (kA)		52			55			52			65
Power-frequency withstand voltage (kV)	Across phases and to earth	42			50			65			95
	Across the isolating distance	48			50			79			95
Lightning impulse withstand voltage (kV)	Across phases and to earth	75			110			125			200
	Across the isolating distance	85			110			145			200
Mechanical life		10000 operations
Control voltage		DC 24V/DC 110V
Control current		Closing 6A, opening 10A / closing 0.71A, opening 1.2A
Gas filling pressure at 20°C (MPa)		0.22		0.24			0.27			0.29
Weight (kg)		105		105			146			146

Standards

GB/T 3804 — High-voltage alternating current switches for rated voltage above 3.6 kV and less than 40.5 kV

IEC 62271-103:2021 — High-voltage switchgear and controlgear - Part 103: Alternating current switches for rated voltages above 1 kV up to and including 52 kV

Note: Please contact HCRT if different operating conditions are required.

Operating Conditions

Max. ambient temperature: +80°C

Min. ambient temperature: -40°C

Relative humidity: Daily average ≤95%; monthly average ≤90%

Seismic rating: Grade 8

Altitude: ≤2000m

Installation environment: Free from flammable or explosive hazards and chemical corrosion

Note: Please contact HCRT if different operating conditions are required.