Types of Circuit Breaker and its Application in
The types of circuit breaker that has been reviewed in this paper are oil circuit breaker (OCB), air circuit breaker (ACB), sulphur hexafluoride (SF6)
A circuit breaker in substation is a key component in electrical power systems, designed to interrupt the flow of electricity when a fault occurs, such as a short circuit or overload. Depending on system design, these devices can operate manually or automatically and come in various types, including air, vacuum, oil, and SF₆ gas.
For example, consider a substation feeding power to an industrial area. If a short circuit occurs on one of the distribution lines due to a tree branch falling on the line, the circuit breaker associated with that line must quickly detect the fault and interrupt the current.
Circuit breakers are devices that interrupt the flow of electricity in an electrical circuit. By interrupting the flow of electricity, circuit breakers protect equipment and people from damage that can be caused by an overload or short circuit.
Example: In a modern urban substation where space is limited, a hybrid circuit breaker might be used to protect the main incoming feeder. The hybrid design allows for compact installation while providing reliable fault protection and efficient arc quenching.
There are three main types of medium voltage circuit breakers- air, oil, and SF6. Air circuit breakers use compressed air to extinguish the arc, while oil and SF6 circuit breakers use dielectric fluids to do the same. Oil circuit breakers have been around the longest, and were actually the first type of MV circuit breaker ever used.
Oil (OCB) use insulating oil to suppress arcs. They are more common in legacy systems and require ongoing maintenance due to oil degradation. SF₆: These breakers, employed in high-voltage substations, use sulphur hexafluoride gas for superior arc quenching and insulation.

The types of circuit breaker that has been reviewed in this paper are oil circuit breaker (OCB), air circuit breaker (ACB), sulphur hexafluoride (SF6)
In this article, you will learn about different types of circuit breakers with their working, parts, and applications are explained with PDF.
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