What is a 5A 250V Slow Fuse
Fuses are commonly described by their voltage rating, current-handling capability and their operating speed. The "5A 250V Slow Fuse" identification describes those three characteristics for a fuse.
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Current Rating
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The "5A" indicates a 5 ampere current rating. The current rating indicates that the fuse would "blow" or open when subjected to a current flow higher than 5 amperes. Many fuse manufacturers de-rated the current handling value by 25 percent to compensate for heat, according to an article on littelfuse.com.
Voltage Rating
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The "250V" indicates a 2500-volt operating limit. The voltage rating indicates the maximum voltage of the circuit appropriate for the fuse. Higher voltages could cause the fuse to explode and cause a fire.
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Operating Speed
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The "Slow Fuse" indicates the fuse has a slow-blow speed rating. This speed of a fuse describes how quickly it reacts to a current overload. There are three basic fuse speeds: ultra fast, fast and slow-blow. Slow-blow fuse designs accept short bursts of high current. These fuses are commonly found with devices such as motors that require a high start-up current.
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References
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