Introduction to Switchgear Low Voltage

What is low voltage switchgear? Metal-clad electrical switchgear with low voltage…

What is low voltage switchgear?

LUGAO low voltage switchgear

Metal-clad electrical switchgear with low voltage is a three-phase power distribution product created to provide electric power securely, proficiently and consistently at voltages up to 1,000 volts and amperage up to 6,000.

Switchgear running on a low voltage can often be spotted near the secondary (low-voltage) portion of a power distribution transformer. This combination of a transformer and switchgear is referred to as a substation. Low-voltage switchgear is usually utilized to supply current to low-voltage motor control centers (LV-MCC), reduced voltage switchboards and other branch and feeder systems.

It is used to supply electricity for critical power and critical process applications such as those found in heavy industry, manufacturing, mining and metals, petrochemical, pulp and paper, utility, water treatment as well as datacenter and healthcare. 

Low Voltage Switchgear Features

LV switchgear is a term used to describe electrical equipment that operates at low voltage, usually below 600 Volts. This type of switchgear includes circuit breakers, relays, and enclosures. It is designed to protect circuits from overloads and short-circuits and provide control of circuits.

The circuit breaker within the low voltage switchgear works by opening or closing a circuit when it senses an overload or short-circuit current. The relay works by sending out signals when certain conditions are met in order to control the circuit operations.

The enclosure houses all the components and protects them from physical damage and environmental elements such as dust, water, etc. Low voltage switchgear is essential for controlling power distribution in industrial applications and can help ensure safety of people and equipment.

GCS low voltage switchgear

What are the major components of a low voltage switchgear?

LV switchgears play a critical role in protecting electrical equipment. Their main components are as follows: 

LV circuit breakers

Circuit breakers are the switchgear devices used to make and break the circuit. The LV circuit breaker is used in electrical systems with a voltage of less than 600V. Air circuit breaker (acb), Earth Leakage Circuit Breaker ❲ elcb ❳, Miniature Circuit Breaker ❲ mcb ❳, Molded Case Circuit Breaker ❲ mccb ❳, and Residual Current Circuit Breaker ❲ rccb ❳ are the most common LV circuit breakers. 

low voltage circuit breaker

Low Voltage Fuse

low voltage fuse

LV fuses are widely utilized in residential and industrial systems. Cartridge fuses, which are amongst the diverse kinds of fuses, tend to be prevalent for domestic applications.

For industrial power systems, general-purpose type ‘g’ fuse-links are employed. The principal benefit of utilizing this fuse is that it will function for currents that range between 1.6 times the rated current and breaking capacity.

Type ‘a’ fuse-links are a great substitute for type ‘g’ in order to save space, however, the raised minimum breaking current rating diminishes its secure operation beneath that limit. Type ‘gG’ fuses are another kind of fuse that shields transformers, circuit breakers, and cables. The breaking capacity scope of these fuses is extensive.

Careful consideration should be taken when selecting fuses for particular purposes, such as motor starters, semiconductors, street lighting and transformers. One specialized fuse-link which can be used in motor-starter systems is the ‘gM’ type fuse-link. It features a dual rating to provide resistance to the high starting currents that occur when starting a motor.


The electrical disconnectors are also called isolators. They are used to break a circuit, but under offload condition. The circuit breaker serves the same function under loaded conditions. The isolators are used to disconnect the faulty sections in a healthy LV power system. And isolate the system for maintenance and repair.


The Basic Functions of LV Switchgear

The basic functions of LV switchgear include energizing and de-energizing the circuit, as well as providing electrical protection against faults such as short circuits or overloads. When energized, it allows current to flow through the circuit, while when de-energized it disconnects the service from the power system.

LV switchgear also ensures that fault currents are limited and this helps to protect the power system from damage due to an electrical fault. In addition, it provides a visual indication of a fault so that appropriate action can be taken to restore service quickly and safely.

Therefore, LV switchgear plays an important role in providing reliable power for any facility or building by ensuring that all its basic functions are carried out properly.

DC screen

What is the Purpose of Low-Voltage Switchgear?

GGD LV switchgear

The primary purpose of low-voltage switchgear is to ensure safe operation and protect people from harm due to excessive current levels. In addition, it can also help reduce power losses in the event of a fault or overload by disconnecting faulty equipment from the main circuit.

Low-voltage switchgear can be made up of several sub-boards for different applications and can be used in both residential and commercial buildings.

It is a very important piece of equipment that helps keep people safe from electric shocks due to high voltage or current levels while providing reliable power supply for various applications.

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