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DFJ-250 Eaton Bussmann 250A Class J High Speed Fuse
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Eaton Bussmann DFJ-250 — 250A Class J high speed fuse, 200 kAIC interrupting. Protects semiconductors in drives, rectifiers and inverters.
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DFJ-250 Eaton Bussmann 250A Class J High Speed Fuse
At a Glance
- 250 A rated current
- 200 kAIC interrupting rating
- Class J time-current characteristic
The Eaton Bussmann DFJ-250 is a high speed fuse with 250 A rated current, 200 kAIC interrupting capacity, carrying a Class J time-current characteristic.
Series Selection Table
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-250?
250 A, with a 200 kAIC interrupting rating.
How much fault current can the DFJ-250 interrupt?
200 kAIC. The available fault current at the installation point must not exceed this value.
What does Class J mean for the DFJ-250?
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-250 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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