DFJ drive fuses

DFJ North American High Speed Fuse

Class J high speed fuses

The Bussmann® series of DFJ high speed, current-limiting fuses are UL Listed Class J fuses.

They provide maximum protection for AC and DC drives and controllers and meet NEC® branch circuit protection requirements.

The DFJ drive fuse has the lowest I2t of any branch circuit fuse to protect power semiconductor devices that utilize diodes, GTOs, SCRs and SSRs.


Data sheet No. 1048

Agency Cards

RoHS compliant

Catalog Number DFJ-_
Dimensions See data sheet No. 1048
Volts - 600Vac (or less)
- 450Vdc (or less 15-600A)
Amps 1-600A
IR - 200kA RMS Sym.
- 100kA DC
Agency Information - CE
- UL Listed Standard 248-8, Class J, Guide JDDZ, File E4273
- CSA Certified, Class 1422-02, File 53787
Typical Applications - Protection of AC and DC drives
- Equipment using power semi-conductor devices


  • Easily coordinated with existing and new variable speed drives and electric controllers
  • Standard Class J dimensions allowing the use of readily available fuse blocks, holders, and switches
  • Allows the lowest let-thru energy of any branch circuit overcurrent protective device