What Is the Purpose of a Load Break Switch?

Are you facing problems with power outages or unsafe maintenance work on the electrical devices? No worries. A load break switch is a complete solution to those problems. This device helps in turning on and off electricity in a manner that is safe, easy, and reliable to both people and equipment.

So, in this blog, we will discuss how it helps maintain the reliability and safety of power systems. So, keep reading!

1) What Is a Load Break Switch?

“A load break switch is a specialised electrical switch which can turn on or off a circuit while the current is still flowing through it.”

A load break switch is an important part of a power system that requires medium voltage. Furthermore, it controls the distribution of power by switching on and off switching from certain sections of the network. This may look small, but it is quite important for a reliable and dependable power system.

To be straightforward,  an LBS (Load break Switch) is designed to work with the current during normal operating conditions. Do you know? It can break or make the load without damage to the system. Yes, it can safely interrupt the electric supply to a section of the network without affecting the entire system. However, LBS does not stop high fault currents.

LBS devices are used in outdoor power lines, in compact switchgear, and in substations. Well, some devices are manually operated to allow a worker to turn them on or off by hand, while others are remote-controlled. Alright! This allows work to be done securely and safely during storms or emergencies.

2) Core Purpose of a Load Break Switch

To begin with, a load break switch (LBS) manages equipment in medium voltage electrical systems, usually ranging from 11kV to 33kV. You know it has a small size, but it performs amazing functions in assuring the continual and secure delivery of power. Let’s talk about some core purposes of a load-reaction switch.

• Safe Control Of Power Flow  

As we already discussed, one of the most important objectives of a load break switch is to manage the flow of electric current. It lets power be switched on or off at one part of the whole system. So, this helps maintain smooth operational flow while providing control over selected sub-systems or areas of the power line.  

• Easy and Safe Isolation  

Well, another major function is isolation. Yes, if there is any fault in any part of the system, it will disconnect the power to that particular section. Therefore, it enhances the safety of workers as the power has been cut off. Moreover, this enhances safety against electric shocks or accidents.

• Helps During Maintenance  

During upgrades or during regular maintenance, the load break switches help in isolating the section of the circuit. As a result, a safe environment is created for workers. Moreover, it is easy to operate the switch as it does not require any special tools.

• Useful in Emergency Situations

Unlike other load break switches, these can now be operated remotely. Such a feature is more helpful in emergencies or bad weather. However, Operators can remove power from a safe distance efficiently, which prevents them from any harm.

• Keeps the System Stable

Moreover, the use of these LBS devices helps prevent drastic changes in power flow. This avoids damage to electrical equipment and makes sure the network stays running properly.

To put it simply, the prime purpose of the load break switch is to control, protect and isolate the system. Therefore, it ensures that the system is stable and working efficiently.

3) Load Break Switch VS Isolator (Disconnector) VS Circuit Breaker

The devices that are used in electrical systems include load break switches, isolators, and circuit breakers. Each device has its unique function to perform. If you understand each device, it will help in learning how electricity is managed safely.

a) Purpose and Function

load break switch: A load break switch enables the opening and closing of electrical circuits on or off in a safe manner while current is flowing through. Hence, Power is controlled during operation.

Disconnectors or isolators: These are used to open a particular section of a given circuit, and they perform work where there is no current passing through.

Circuit breaker: Unlike the rest of the devices, the circuit breaker does not only switch on and off. It also saves the system by automatically shutting off the electric current whenever there are faults. For example, short circuits and overloads.  

b) Operation Under Load

Load break switch: The load break switch can safely open or close a circuit where current is passing through without any complications.

Isolator: Conversely, the isolator cannot be used under load. It can only be opened where the circuit is de-energised and can be opened fairly easily.

Circuit breaker: Circuit breaker is another such component that can operate under load. It quickly interrupts short currents to prevent any damage. So, in this way, it enhances system safety.

c) Fault Protection

Load break switch: A load break switch does not guard against electrical faults. So, it only breaks power under normal conditions.

Isolator: On the other hand, an isolator or disconnector offers no protection at all; it simply isolates the circuit. Hence, it does not disconnect the electrical supply.

Circuit breaker: In contrast, a circuit breaker automatically interrupts current to safeguard people and equipment from overloads or short circuits.

d) Manual vs Automatic Operation

Load break switch: Mostly load break switches are operated by hand/manually, but a few are motorised.

Isolators: These are typically manual devices.

Circuit breakers: Breakers can be both automatic and manual. So, the circuit breakers automatically interrupt the current to save the equipment and people.

e) Common Use Cases

Load break switches: These can be found in the distribution networks of medium-voltage power plants. It is because they are effective in handling the switching of normal loads.

Isolators: They serve the purpose of removing a circuit or equipment from a system for safe maintenance.

Circuit breakers: These are used in industrial plants and residential electric panels because these systems require switching and protection.

f) Expenses and complexity

Load break switches: They can be applied easily and economically where fault protection is not a requirement.

Isolators: They are inexpensive devices and offer simple operational requirements.

Circuit breakers: The circuit breakers are costly because of the protection mechanism, along with their automatic features.

Feature	Load Break Switch	Isolator (Disconnector)	Circuit Breaker
Purpose	Switches load current	Isolate the circuit safely	Switches and protects the circuit
Operates under load?	Yes	No	Yes
Fault protection	No	No	Yes
Operation type	Manual or motorised	Manual	Manual or automatic
Provides visible isolation	Yes	Yes	Sometimes
Typical use	Load switching in power distribution	Safety isolation for maintenance	Protection and switching in industrial/residential
Cost and complexity	Moderate	Low	Higher

4) Main Components of a Load Break Switch 

Externally, a load break switch (LBS) may not look complicated, but internally, it consists of many important components. Each of the parts has a specific function within the system to ensure that it operates safely and properly. Let us look at the most important components of an LBS that work efficiently. So, keep in touch!

i) The Switching Mechanism

The switching mechanism serves as the heart of the load break switch. This component makes the cut in or out of the electrical circuit. The load current has to be confined within this portion as part of the design.

While using the switch, this mechanism moves the contacts to either connect or disconnect the power. It must be strong and reliable because it controls the flow of electricity.

ii) Electrical Contacts

The next component is electrical contacts, where the electrical connection occurs. There are two types of electrical contacts such as fixed contacts and moving contacts.

When these contacts touch each other, then the switch is closed, and hence current is allowed to flow. When these contacts separate, then the switch is open and hence the flow of current is stopped.

iii) Insulation

Another component is insulation. It ensures the live parts remain isolated and also safeguards the switch against short circuits. Insulation material is around the contacts and other system parts for their safety. And, if the insulation is not done correctly, then severe accidents might occur.

iv) Operating Mechanism

The operating mechanism enables both manual and automatic control of the switch. However, Certain load break switches use a handle or lever for manual control. Others allow remote operation via electric or motorised controls. So, it is simple and safe to operate the switch in various conditions due to this mechanism.

v) Arc Extinguishing Device

When contacts are opened, an electric arc might occur. Therefore, this device can eliminate the arc in no time to ensure safety and protect the switch.

5) Types and Application Scenarios

Different types of load break switches are designed for specific uses. Let’s discuss their types and applications carefully, so go ahead!

• Types of Load Break Switches  

i) Manual Load Break Switch: As the name suggests, this type can be operated through a hand lever or handle. It is straightforward and dependable. It works best in locations where trained personnel can safely and reliably turn off power.  

ii) Motorised or Remote-Controlled Load Break Switch: This type can be operated remotely through electric motors or remote controls. Moreover, it is most useful when needing to switch something away from a location quickly or in emergencies.  

iii) Indoor Load Break Switch: These are used inside buildings or control rooms. It is protected from dust, moisture and weather.  

iv) Outdoor Load Break Switch: It is usually seen mounted on poles or on outdoor substations, which are often exposed to rain and dust and extreme heat.  

• Application Scenarios of Load Break Switches

i) Medium Voltage Distribution Networks: Load break switches can be used in medium voltage distribution networks, like in overhead power lines as well as underground cables. Here, they help in the safe control and management of the electricity flow.  

ii) Substations: These are used to isolate such sections of the power system for their maintenance or repairs.

iii) Protection of Switchgear and Transformers: Moreover, LBS are needed to safely disconnect transformers and switchgear.

iv) Factories and Industrial Plants: Furthermore, the load break switches are used in factories and industrial plants for safely disconnection of the power supply to the machines.  

v) Automated Systems and Smart Grids: To enhance safety and response time, operators can remotely control electricity management using Remote Control Load Break Switches.  

6) Load Break Switch Benefits

You know, A load break switch (LBS) is very helpful in the safe, secure, manageable, and reliable control of power in electrical systems. Let us look at some benefits of a load break switch, so move forward!

+ Safety: The use of LBS improves the safety of workers by allowing them to disconnect power before doing repairs or maintenance. It also helps in reducing accidents or electric shock because the switch clearly isolates that part of the system.

+ Fast and Easy Operation: All Load break switches are constructed such that they can easily be operated manually or remotely and turned on or off at any time. Their operation is effortless, and activities like maintenance and emergencies can be handled without any difficulty.

+ Protects Equipment: A load break switch helps protect electrical equipment. Thus, it limits damage by controlling the flow of power systematically. Moreover, it prevents opening or closing the switch to sudden jolts or sparks that are damaging to devices. This is important in increasing the lifespan of transformers, cables, and other equipment.

+ Enhances System Reliability: An LBS aids in providing steady and dependable power. Moreover, it allows safe isolation of network sections for equipment maintenance without shutting down the system.

+ Cost-Effective Solution: Lastly, load break switches are an economical option for many power systems. They cost less than circuit breakers but provide critical switching and isolation capabilities. Their use is beneficial to the utilities and industries as they save money.

7) Delixi Outdoor Load Break Switch

Delixi Electric has developed the 11- 33kV Outdoor Load Switches, which are appropriate for use in the medium-voltage power transmission and distribution systems. Such switches can be applied in substations, overhead lines, and industrial power systems.

• Available Models

The product line of Delixi outdoor load break switch  includes the following models: Let’s take a look at the given list:

FZW28-12: Outdoor Boundary Vacuum Load Break Switch

FKW18-33KV: Outdoor Medium Voltage Air Load Break Switch

FZW32-33KV: Medium Voltage Vacuum Load Break Switch with Fuse

FW32-40.5: Outdoor Medium Voltage Vacuum Load Breaker Switch

PGS-630A: Pole mounted Intelligent SF6 Load Break Switch

FZW32-12: Outdoor Medium Voltage Vacuum Load Break Switch

FKW18-11 kV: Outdoor Medium Voltage Air Load Break Switch

• Key Features

• Voltage Range: The voltage Range of Operation for systems is between 11kV and 33kV.

• Installation: It is configured for outdoor operation and can be mounted on poles.

• Operation: It is present in either vacuum or SF6 gas-insulated types with manual or automated control options.

• Applications

Delixi’s outdoor load break switch is ideal for use in the sectioning of overhead lines, transformer protection, and fault isolation in medium voltage networks.

8) Conclusion

Alright! A load break switch is an essential component for the protection and control of electrical power systems. It is because it assists in circuit isolation, damage prevention, and simple and safe maintenance of electrical power systems. Whether manual or motorised, indoor or outdoor, load break switches serve an essential function in dependable electricity distribution.

Delixi Electric is one of the best manufacturers of load break switches because we offer such products that meet demands with international standards. You should choose Delixi products for safety, durability, longevity and smart power control of your electric system. You can contact us right now by clicking here.