What Is The Difference Between Air Circuit Breaker And Vacuum

By | January 1, 2023



A circuit breaker is an essential component of an electrical system that helps protect it against power surges and other fluctuations. The two main types of circuit breakers are air circuit breakers (ACBs) and vacuum circuit breakers (VCBs). While both types of circuit breakers serve the same purpose, there are a few key differences between them.

Air circuit breakers (ACBs) are used in high-voltage electrical systems and employ compressed air to de-energize the circuit when an overload or short circuit occurs. This is done by a set of contacts attached to an arc chute that releases the compressed air when an electrical fault occurs. This creates a break in the circuit that eliminates current flow.

Vacuum circuit breakers (VCB), on the other hand, rely on a vacuum to create a break. Vacuum circuit breakers use a hermetically sealed container filled with a vacuum medium instead of air. The vacuum medium helps to reduce the number of electrons available in the circuit, which reduces the magnitude of electrical faults. This allows VCBs to be used in extremely low-voltage applications, as well as in very high-voltage applications.

Another key difference between ACB and VCB is the size. Since ACBs are designed to handle higher voltages, they tend to be larger and heavier than VCBs. This makes them more expensive to purchase and install. Additionally, ACBs require more maintenance than VCBs due to their complex design and size.

Finally, ACBs generally have a shorter lifespan than VCBs. This is due to the fact that the compressed air used in ACBs is highly susceptible to aging, which can reduce its efficiency over time. On the other hand, VCBs do not suffer from this issue and can last for many years without requiring any maintenance.

In conclusion, air circuit breakers and vacuum circuit breakers are two different types of circuit breakers used for different applications. While they both serve the same purpose, they have some key differences. The most notable differences include size, lifespan, cost, and maintenance requirements. In the end, it comes down to the individual needs and preferences of the user.


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