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Feeo Electric Tells You What Is An ‘’a‘’ Class Fuse?

An “a” class fuse or partial range breaking capacity fuse, also known as a ‘back up’ fuse, is a LV current limiting fuse capable of breaking under specified conditions all currents between the lowest current K²In indicated on its time current characteristics and its related breaking capacity. “a” class fuses are generally used to provide short circuit protection. Where protection is required against over currents less than K²In (small over currents, overloads), these fuses either need to be used in conjunction with another suitable switching device or “g” class fuses must be used instead.