The Eaton Bussmann DFJ-1 is a high speed fuse with 1 A rated current, carrying a Class J time-current characteristic.
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-1?
1 A.
What does Class J mean for the DFJ-1?
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-1 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.