Air circuit breakers are used to control power station auxiliaries and in electrical machinery like capacitors and generators. They are also widely used in maintaining indoor medium voltage and switchgears.

They have a simple design with two main points of contact made of copper alloy. When opened, they create an arc which must be contained and cooled to prevent damage and then extinguished.

Low-voltage ACBs

For residential, commercial and industrial applications, ACBs protect against overvoltage and electrical faults. They interrupt current to stop power flow, preventing injuries and property damage. They are available in a variety of sizes and voltage ratings to suit different applications.

The ACB arcing mechanism uses pressurized air to separate contacts and extinguish the arc. This type of circuit breaker is usually found in electrical substations and power plants. They can handle large amounts of current and are a popular choice for high-voltage systems. air circuit breakers can be manually or electrically operated, depending on the application. They can also be equipped with various accessories and devices to protect your electrical circuits. They can be used as a master circuit breaker device in factories and buildings, as well as the main circuit breakers in ships. These are some of the most common types of circuit breakers available, alongside other options like earth leakage circuit breakers and miniature used circuit breakers.

Medium-voltage ACBs

Air circuit breakers protect electrical equipment from overcurrents and short circuits. They act as a combination of fuses and relays in the sense that they interrupt current flow when there is an overload or failure. They are usually found in buildings and industrial settings.

ACBs use pressurized air as an arc extinguishing medium. They also work with both DC and AC currents. There are several different types of ACBs based on voltage capacity and the needs of the application. For example, there are plain brake type ACBs that have a pair of points of contact in the shape of two horns. When the contacts separate, these points form an arc that is then elongated and eliminated by the pressurized air in chutes. The other common type of ACB is a magnetic blowout model that uses a magnetic field to assist in eliminating the arc. This type of ACB can have up to 11KV rating and works with both DC and AC currents.

High-voltage ACBs

The main part of ACBs is the conductive part which consists of dynamic and static arc contacts. These contacts are operated using current and they connect each other when a fault occurs. The insulating part is made of SF6 gas, porcelain sleeve, and other forms of transition connections. These insulating parts prevent the arc from spreading to other parts of the circuit and from touching the ground.

When the arc contacts separate due to high current or voltage, they activate blast valves and pressurized air is pushed through arc chutes. The arc is then extinguished, making the equipment safe. There are various types of ACBs that operate at different voltage capacities. For example, a plain ACB is designed for upstream side of the circuit while a magnetic blowout ACB is used on load side control. They also have different trip units such as thermal-magnetic and electronic. However, both serve the same function and are important safety devices for electrical systems.