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Fuse Sizing Calculator
Calculate proper fuse rating based on load current, NEC guidelines, and I²t coordination.
Continuous Load Current
?
Normal operating current of the circuit.
A
Inrush Current
?
Peak inrush current on startup.
A
Inrush Duration
?
Duration of inrush current.
ms
Ambient Temperature
?
Operating ambient temperature.
°C
Calculate
Results
Min Fuse Rating (125%)
-
A
Inrush I²t
-
A²s
Derating Factor
-
References:
NEC Article 240; IEC 60269; Littelfuse Fuseology Guide