The rated voltage of a fuse-link must be greater than or equal to the operating
voltage of the equipment which is to be protected.
The difference between an applied AC voltage or is DC voltage to a fuse; The fuse-links are on principle suitable for use at alternating and direct voltage. The breaking capacity at direct-voltage is however considerably lower
than the one at alternating voltage. The performance of the fuse-link at direct-voltage mainly depends on the size of the time-constant _ = L/R of the load circuit.
Glass body fuses seem to have a DC voltage rating half that of a maximum DC voltage rating [in general]. While Ceramic cases appear to have the same maximum voltage rating regardless of the operating voltage, AC or DC.
The Military standard for Fuses; MIL-PRF-23419 does not seem to differentiate between AC or DC voltages for low voltage fuses.
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Fuses are specified to interrupt within a maximum of 5 seconds when
driven at 200% of their rated current for nominal ratings up to and
including 10 amperes. A fuse with a nominal rating of 15 amperes is
specified to interrupt within a maximum of 10 seconds when driven at 200%
of its rated current. The power supply shall be capable of delivering
appropriate levels of current to achieve short fusing times. There is an
additional derating of 0.2%/°C for an increase in the temperature of
fuse body.
A manufacturers listing for Fuses
Derating guidelines for other components;
Guideline for Derating Electronic Components
Engineering Key Words: Fuse, Component Derating, reliability, Sizing, Derate, Ampacity, Fusing, Insulation, Rated Temp, Temperature, Guide, Guideline, Example, Surge, Class, Design, Derate Fuse Operation.
