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An air circuit breaker is a type of circuit breaker that uses air as the medium to extinguish the arc formed during the interruption of an electrical circuit. ACBs are commonly used in low voltage systems to protect against short circuits, overloads, and other faults. They are designed to handle high currents and are often employed in industrial and commercial applications.

The primary function of an ACB is to detect abnormal current conditions in a circuit and interrupt the flow of electricity to prevent damage to the circuit and connected equipment. When a fault occurs, such as a short circuit, the ACB quickly interrupts the circuit by opening its contacts, thereby isolating the faulty section from the rest of the system. This helps in minimizing the potential damage caused by the fault.

ACBs typically consist of a contact system, an operating mechanism, and a trip unit. The contact system is responsible for making and breaking the electrical circuit under normal and fault conditions. The operating mechanism controls the opening and closing of the contacts, while the trip unit detects abnormal conditions and triggers the opening of the contacts.

The choice of an ACB depends on various factors, such as the rated current, short circuit capacity, and operational requirements of the system. It's essential to select the appropriate ACB to ensure reliable and efficient protection of the low voltage circuit.

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