distinguish between class P and class Q type of fuses
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In general, fuses are devices that are designed to protect electrical circuits from damage due to overcurrent conditions. Fuses are classified into different classes based on the type of current they are designed to protect against and the time it takes for the fuse to open (i.e., “blow”) when the overcurrent condition is present.
Class P fuses are designed to protect against overcurrents of short duration, typically less than one-half cycle of the AC power supply. These types of fuses are commonly used in circuits that are subject to momentary overcurrents, such as those caused by the starting of motors or the switching of inductive loads.
Class Q fuses, on the other hand, are designed to protect against sustained overcurrents. These types of fuses are typically used in circuits that are subject to prolonged overcurrent conditions, such as those caused by short circuits or ground faults. Class Q fuses are typically slow-blow fuses, meaning that it takes a longer period of time for the fuse to open when an overcurrent is present.