Molly Ayala
LBS stands for Load Break Switch, a device that regulates the flow of electrical current in a circuit. It is used to ensure the on-load making, breaking, and safety disconnection of low-voltage electrical circuits. Load break switches can be manual, automated, or have a trip function, and are necessary for emergency switching, public distribution, and distribution panels. They are also provided with an Earth Switch, which helps to ground charges that may be present even after the switch is turned off.
LBS: Load Break Switch
| Characteristics | Values |
|---|---|
| Function | Ensure the on-load making, breaking, and safety disconnection of low-voltage electrical circuits |
| Current | Can switch voltages from 1000 volts to 33k volts |
| Type | Manual, automated, or with a trip function |
| Safety | Provided with current-limiting power fuses |
| Design | User-friendly, light, and compact |
| Use Cases | Industrial sector, emergency switching, public distribution, motor feeders, and distribution panels |
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What You'll Learn
Load Break Switch (LBS)
A Load Break Switch (LBS) is a device that ensures the on-load making, breaking, and safety disconnection of low-voltage electrical circuits. LBS switches are used to cut off healthy circuits or to break/disconnect the load. They are the opposite of non-load break switches, which can only be operated when the current is zero. LBS switches are necessary for emergency switching, public distribution, motor feeders, and distribution panels.
LBS switches work by mechanically moving their contact at a proper speed to "make" or "break" the current. "Make" means to close the current, while "break" means to open the current. During switching, LBS switches are subjected to mechanical, thermal, and dielectric stresses. Therefore, they must undergo numerous tests in accordance with IEC 62271-103 to investigate their interrupting capabilities.
LBS switches are often equipped with current-limiting power fuses, arc-extinguishing devices, and a striker mechanism. The striker is a safety feature that automatically opens all switches when the fuse blows, preventing a dangerous situation. LBS switches also have a switching device that assists in grounding any remaining charges after the switch is turned off.
LBS switches are available in manual, automated, or trip function variants. They are known to be affordable, safe, and easy to assemble and use. They are widely used in the industrial sector and for power grid equipment, as well as in mining enterprise power design.
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LBS Functionality
LBS stands for Load Break Switch, a device that ensures the on-load making, breaking, and safety disconnection of low-voltage electrical circuits. It is a replacement for a 2-pole structure and provides protection to the transformer.
A Load Break Switch (LBS) is a device used to regulate the flow of electrical current in a circuit. It can be used to either start or stop the flow of current by creating an air insulation gap between two conductors. LBS are commonly used in industrial applications, emergency switching, public distribution, motor feeders, and distribution panels. They are available in both indoor and outdoor versions and can be operated manually, automatically, or with a trip function.
One of the key functionalities of an LBS is its ability to interrupt the current. It must be able to interrupt the current equivalent to the continuous current rating in the system voltage and provide sufficient insulation to isolate the circuit when it is closed. This is achieved by mechanically moving its contact at the proper speed to "make" or "break" the current. "Making" refers to closing the current, while "breaking" means opening the current.
Another important aspect of LBS functionality is its ability to handle arcing phenomena. During switching, an LBS is subjected to mechanical, thermal, and dielectric stresses, which can result in arcing. To address this, LBS are designed with equipment that enhances the disconnect switch blade's operating speed and helps safely stop arcs that occur when switching load currents. This ensures the safe disconnection of low-voltage electrical circuits.
Additionally, LBS are designed to meet specific standards and undergo rigorous testing to ensure their reliability and safety. They are manufactured in accordance with IS 9920 / IEC 265 and IEC 62271-103, which outline the necessary test duties to investigate and explore their interrupting capabilities. Current levels and Transient Recovery Voltage (TRV) are critical factors examined during breaking tests.
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LBS vs Circuit Breaker
LBS stands for Load Break Switch, a device that ensures the on-load making, breaking, and safety disconnection of low-voltage electrical circuits. It is a switch used to switch voltages from 1000 volts to 33 kilo volts. It is a replacement for a 2-pole structure and provides protection to the transformer, which a 2-pole structure cannot. LBS can be manual, automated, or have a trip function.
A circuit breaker, on the other hand, is a device that can interrupt flowing current. It can interrupt fault current or load current and is very fast. A circuit breaker can make and break both load currents and fault currents. It is designed for interrupting the maximum interrupting current (IC) that will be experienced in a fault.
The main difference between LBS and a circuit breaker is that an LBS can only make and break load currents, whereas a circuit breaker can make and break both load currents and fault currents. Another difference is that an LBS is designed for interrupting the maximum rated load multiple times, while a circuit breaker is designed for interrupting the maximum interrupting current (IC) a limited number of times.
In terms of usage, an LBS is necessary in the industrial sector, emergency switching, public distribution, motor feeders, and distribution panels. It can be used to either stop or start the flow of the current. It is also provided with an Earth Switch, which helps in grounding the charges that can be present even after the switch is turned off. A circuit breaker, on the other hand, is often used in motor circuits, where it opens by breaking a control circuit.
In conclusion, while both LBS and circuit breakers are important components in electrical systems, they have distinct functions and capabilities. LBS is more limited in its ability to interrupt currents compared to a circuit breaker but offers other advantages such as being more affordable and having a long service life.
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LBS Striker Mechanism
LBS stands for Load Break Switch, a device that ensures the on-load making, breaking, and safety disconnection of low-voltage electrical circuits. It is a switch used to switch voltages from 1000 volts to 33 kilovolts. It is a replacement for a 2-pole structure and provides protection to the transformer.
The LBS series incorporates a striker mechanism that automatically opens the switches when the fuse blows. This is a safety feature that prevents some of the phases from remaining live after the fuse has blown, which could result in a dangerous situation. The striker is a trip mechanism that operates the moment the fuse blows, causing all 3-poles to open simultaneously.
The LBS is an air load break switch with attached power fuses, a feature not found in conventional load break switches. The FUJI air load break switch type LBS is provided with current-limiting power fuses, while type LB is not. Both types are compact and incorporate arc-extinguishing devices. The arc is drawn into a long, narrow chamber with close clearances where the gases are rapidly cooled and dispersed, resulting in less contact wear and a longer service life.
The load break switch alters the current by mechanically moving its contact at the proper speed to "make" or "break" the current. "Make" refers to closing the current, while "break" means opening the current. It is necessary in various applications, including the industrial sector, emergency switching, public distribution, motor feeders, and distribution panels.
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LBS Manufacturers
LBS stands for Load Break Switch, a device that ensures the on-load making, breaking, and safety disconnection of low-voltage electrical circuits. It is a vital component in the industrial sector, emergency switching, public distribution, motor feeders, and distribution panels.
Load Break Switch Manufacturers:
There are several manufacturers of LBS, including Fuji Electric FA Components & Systems Co., Ltd., which offers the LBS as part of its air load break switch series. The LBS type is provided with FUJI power fuses, ensuring accurate and uniform interrupting performance. It is also equipped with a striker mechanism that automatically opens the switches when the fuse blows, enhancing the safety of the electrical system.
Another manufacturer is Powertech Engineers, based in Nashik, Maharashtra, India. They offer a range of electrical products, including control panels and transformers. Their LBS products are known for their robust and efficient design, ensuring seamless load management and improved safety.
Krisha Panel Builder, established in 2024 and located in Ahmedabad, Gujarat, India, is also a leading manufacturer of control panels. They offer a wide range of products, including LBS panels, and are recognised for their reliable and diverse offerings.
Socomec is another company that offers LBS solutions, specialising in load break switching devices for AC and DC applications. Their products ensure both on-load switching and isolation, guaranteeing operator safety in low-voltage electrical facilities.
These manufacturers play a crucial role in providing essential components for electrical systems, contributing to the smooth and safe functioning of various industries and applications.
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Frequently asked questions
LBS stands for Load Break Switch.
A Load Break Switch is a device that regulates the flow of electrical current in a circuit. It can be used to stop or start the flow of the current.
A Load Break Switch ensures the on-load making, breaking, and safety disconnection of low-voltage electrical circuits. It can be used to regulate all kinds of currents, including normal and short-circuit currents.
A Load Break Switch can be manual, automated, or have a trip function.
