GIS Three-position Load Break Switch for Gas Insulated Switchgear – 12kV to 40.5kV Medium Voltage LBS with Making, Isolating, and Earthing Functions

The GIS Three-position Load Break Switch is a high-performance electrical component designed specifically for Gas-Insulated Switchgear (GIS). This single compact unit seamlessly integrates three critical operational functions: making, isolating, and earthing, ensuring maximum system stability and maintenance safety.

Product Name

GIS Three-position Load Break Switch for Gas Insulated Switchgear – 12kV to 40.5kV Integrated Making, Isolating, and Earthing LBS

Product Overview

The GIS Three-position Load Break Switch is a high-performance electrical component designed specifically for Gas-Insulated Switchgear (GIS). It features a modular and compact design that fits seamlessly into medium-voltage GIS enclosures, enabling flexible installation while saving critical space.

This single unit integrates three essential operational functions—making, isolating, and earthing. Utilizing advanced arc extinguishing technology with gas-filled chambers, it ensures a high breaking capacity and an extended service life even in harsh environments.

Technical Parameters

Item	Specification	Unit	Data
Rated Voltage	System Voltage	kV	12 / 24 / 40.5
Rated Frequency	Power Frequency	Hz	50
Rated Current	Load Current	A	630
Rated Short-time Withstand Current	Thermal Stability	kA	20 / 25
Rated Peak Withstand Current	Dynamic Stability	kA	50
Rated Short-circuit Duration	Time Limit	s	4
Rated Short-circuit Closing Current	Fault Closing	kA	50
Theoretical Operation	Mechanical Life	times	5000

Key Features & Advantages

1. Three-Position Integrated Design

Making: Reliably carries rated currents and short-time fault currents to ensure system stability.
Isolation: Features visible breakpoints to ensure safe and absolute electrical isolation during maintenance.
Earthing: Rapid grounding functionality protects personnel and equipment during system servicing.

2. Advanced Engineering

Arc Extinguishing: Optimized contact structures and gas-filled arc chambers deliver superior interruption performance.
Reliability: A fully sealed structure makes the switch resistant to dust and moisture, ideal for harsh industrial environments.
Easy Maintenance: A three-position mechanical interlock simplifies operations and significantly reduces the need for frequent gas refilling.

Environmental Operating Conditions

Altitude: Should not exceed 2000m.
Ambient Temperature: Operates reliably between -40°C and +140°C.
Humidity: Daily and monthly average relative temperature should not exceed 90%.
Vibration: Vibration cracking degree should not exceed 8 degrees.
Note: Not suitable for sites with frequent severe vibrations, chemical corrosive deposition, or high fire/explosion hazards.

Applications

Urban distribution networks
Industrial substations
Renewable energy integration (Solar, Wind)
Rail transit power systems

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