Fuse & Breaker Sizer
Calculate the correct fuse or circuit breaker rating for your DC circuit. Ensures the protection device is rated between the load current and wire ampacity.
Circuit Parameters
A
Max continuous current draw
1.25×
1.0×1.25×1.5×2.0×
1.25× is standard. Fuse must be rated above load current but below wire ampacity.
Sizing Rule
Load: 30A<Fuse: 38A – 40A≤Wire: 40A
Min Fuse
38
A
Max Fuse
40
A
Wire Ampacity
40
A
Options
3
fuses
Compatible Fuses & Breakers
blade Fuses
40A Blade Fuse(best)
MIDI Fuses
40A MIDI Fuse(best)
Circuit Breakers
40A DC Circuit Breaker(best)