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DFJ-3 Eaton Bussmann 3A Class J High Speed Fuse
DFJ-3 Eaton Bussmann 3A Class J High Speed Fuse

DFJ-3 Eaton Bussmann 3A Class J High Speed Fuse

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Eaton Bussmann DFJ-3 — 3A Class J high speed fuse. Protects semiconductors in drives, rectifiers and inverters.
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    DFJ-2 Eaton Bussmann 2A Class J High Speed Fuse
    EatonFuseBussmannLow Voltage FusesSemiconductor ProtectionClass J
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    DFJ-3 Eaton Bussmann 3A Class J High Speed Fuse

    At a Glance
    • 3 A rated current
    • Class J time-current characteristic

    The Eaton Bussmann DFJ-3 is a high speed fuse with 3 A rated current, carrying a Class J time-current characteristic.

    Series Selection Table

    DFJ-3 series selection table
    Ampere ratings, dimensions and catalog numbers across the High Speed Fuse family, reproduced from the Eaton Bussmann datasheet.

    Applications

    • Industrial equipment

    Selection Notes

    • Semiconductor fuses are chosen on I²t let-through against the device surge rating, not on continuous current alone.

    Common Questions

    What are the ratings of the Eaton Bussmann DFJ-3?
    3 A.
    What does Class J mean for the DFJ-3?
    Class J defines the fuse's time-current characteristic. E-rated fuses carry a defined melting curve so they coordinate predictably with upstream and downstream devices; mixing E and non-E ratings in one feeder defeats that coordination.
    How should I select the DFJ-3 for a circuit?
    Match the voltage rating to the system voltage, keep the continuous current above the load current, and check that the interrupting rating exceeds the available fault current. In medium voltage work, select on the transformer or feeder fault level rather than the load current alone.

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