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Recommended Fuse Size
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Time-Delay Fuse
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Non-Time-Delay Fuse
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Minimum Fuse Size
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Maximum Fuse Size
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Fuse size depends on load type and electrical standard. For continuous loads, multiply current by 125% (NEC). For motor loads, use 175% of Full Load Current for time-delay fuses or 300% for non-time-delay fuses.
NEC (North American) uses specific multipliers based on load type, while IEC (International) provides ranges based on motor nameplate current and fuse characteristics (gG/gL or aM types).
A 3HP motor typically has 17.5A Full Load Current (230V). Using NEC standards, you'd need a 30A time-delay fuse (17.5 x 1.75 = 30.6A, rounded to next standard size).
Time-delay fuses are preferred for motor loads as they allow for motor starting currents. Non-time-delay fuses are used for resistive loads or when faster protection is needed.
For a 2000W inverter at 12V DC: 2000W ÷ 12V = 167A. Adding 25% safety margin gives approximately 208A, so you'd use a 200A or 225A fuse depending on available sizes.
Never exceed the maximum calculated fuse size, as this compromises safety and code compliance. The wire and equipment ampacity must also support the fuse size chosen.
An undersized fuse will blow frequently during normal operation, especially during motor starting or equipment inrush currents, causing unnecessary downtime and nuisance tripping.
DC systems follow similar principles but may have different safety factors. Always consult equipment manuals and local codes, as DC arc characteristics differ from AC systems.