Load Break Switch: Essential Protection for Modern Medium-Voltage Power Distribution



Load Break Switch: Key Component for Safe and Efficient Power Distribution

As industrial infrastructure expands and power systems become more distributed, the need for safe and flexible medium-voltage control systems increases. One device that plays a critical role in ensuring secure electrical operation is the Load Break Switch (LBS).

A Load Break Switch provides the capability to switch electrical circuits on and off under normal load conditions, ensuring stable control and sectioning of the network. It acts as a protective boundary in distribution systems, offering both switching and safety isolation without the need for heavy-duty circuit-breaking equipment.

Degatech Electric Co., Ltd. (https://chinadegatech.com/) manufactures reliable and advanced Load Break Switch solutions designed to help industries and utilities maintain uninterrupted and secure power delivery in dynamic and demanding environments.

What Is a Load Break Switch?

A Load Break Switch is a mechanical switching device used in medium-voltage power systems to interrupt circuits carrying load current. Unlike a circuit breaker, it is not designed to interrupt large short-circuit currents. Instead, its function is to:

  • Provide load current switching capability

  • Define protection zones

  • Enable safe maintenance isolation

  • Prevent network-wide outages during service

LBS is an essential component within Smart Grid and Distributed Power networks.

How Does a Load Break Switch Work?

The switch uses an arc-quenching system to extinguish the electric arc when the contacts separate. Methods include:

  • Air insulation arc quenching

  • SF₆ gas insulation (gradually declining due to environmental regulations)

  • Vacuum arc quenching (modern preferred technology)

  • Solid dielectric encapsulated switching

The use of vacuum interrupters significantly improves life expectancy and service safety.

Key Benefits of Load Break Switches

BenefitDescription
Safe Switching Under LoadPrevents arc faults and energy surges
Improved System ReliabilityEnables sectionalizing for fault management
Lower Maintenance CostSimple structure with long life cycle
Enhanced Operation FlexibilitySupports radial, loop, or network configurations
Quick Fault IsolationLimits power interruptions to a small area

When paired with a protection relay and remote control technology, LBS supports rapid distribution automation.

Types of Load Break Switches

1. Air-Insulated Load Break Switch (AIS)

  • Most common and cost-effective

  • Suitable for indoor distribution systems

2. Gas-Insulated Load Break Switch (GIS)

  • Compact and highly reliable

  • Enclosed in SF₆ insulated chambers

3. Vacuum Load Break Switch (VLBS)

  • Best environmental performance

  • Long mechanical and electrical endurance

4. Solid-Insulated Load Break Switch (SIS-LBS)

  • No SF₆ usage

  • Full insulation and sealed protection

Degatech is actively promoting solid and vacuum-based switching to support environmental responsibility.

Common Applications of Load Break Switches

LBS is widely used in:

  • Urban distribution networks

  • Ring main units (RMUs)

  • Industrial power systems

  • Utility substations

  • Mining operations

  • Solar and wind energy farms

  • Airports, seaports, and public infrastructure

Where safe and fast circuit isolation is essential, LBS is a core device.

Installation Configurations

  • Indoor/Outdoor mounting options

  • Wall-mount or floor-standing cabinets

  • Motorized or manual operation

  • SCADA remote control capability

LBS integrates easily into Ring Main Units and Compact Substations.

Load Break Switch vs Circuit Breaker

FeatureLoad Break SwitchCircuit Breaker
Short-Circuit BreakingNoYes
Main FunctionLoad switching and sectioningFault current interruption
CostLowerHigher
MaintenanceSimplerMore complex

In many distribution networks, LBS and breakers are used together to optimize system protection.

Smart Grid Integration

With remote control and IoT communication, LBS enables:

  • Feeder automation

  • Self-healing networks

  • Instant fault localization

  • Faster power restoration

Degatech offers LBS compatible with modern monitoring systems to support intelligent power delivery.

Standards and Quality Compliance

Degatech Load Break Switches meet global standards including:

  • IEC 62271-103 (switching devices)

  • IEC 62271-102 (earthing switches)

  • ISO 9001 and environmental safety standards

We ensure product reliability through:

  • Partial discharge monitoring

  • Temperature rise testing

  • Mechanical endurance qualification

  • Voltage withstand verification

Why Choose Degatech LBS?

Degatech provides:

Advanced Vacuum Switching Technology

Improved electrical endurance and arc extinction

Custom Mechanical Interlock Design

Prevents incorrect operation and enhances safety

Durable Construction for Harsh Environments

Suitable for coastal, desert, and industrial pollution zones

Fast Delivery & Engineering Support

Professional design assistance throughout your project lifecycle

Degatech's solutions are trusted internationally for stable and safe power distribution management.

Learn more at: https://chinadegatech.com/
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