An auto circuit breaker is a device that automatically interrupts the flow of electric current in a circuit when certain conditions are met. It is designed to protect electrical equipment and prevent electrical fires caused by overloads or short circuits. When the current flowing through a circuit exceeds the rated limit of the circuit breaker, it automatically trips and interrupts the circuit. This prevents the wires from overheating and potentially causing a fire. Auto circuit breakers can also detect and react to short circuits, which occur when two wires come into direct contact with each other. Auto circuit breakers are commonly used in residential, commercial, and industrial electrical systems to provide protection for various types of equipment and appliances. They are typically installed in electrical panels or distribution boards and can be manually reset after they trip. In addition to their automatic tripping mechanism, some auto circuit breakers may also have additional features such as ground fault circuit interrupters (GFCIs) or arc fault circuit interrupters (AFCIs) to provide enhanced protection against electrical shocks and arc faults.