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The AIR rating of a fuse, or Ampere Interrupting Rating, indicates the maximum fault current that the fuse can safely interrupt without causing a failure or explosion. It is a critical parameter for ensuring that the fuse can handle unexpected short circuits or overloads in an electrical system. A higher AIR rating signifies that the fuse can manage larger fault currents, providing greater protection for electrical circuits and equipment. Properly selecting a fuse with an appropriate AIR rating is essential for safety and reliability in electrical installations.

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