DFJ — UL Class J full range high speed fuse

UL Class J high speed, full range current-limiting fuses provide
maximum protection for AC and DC drives and controllers. The
UL Class J Bussmann series DFJ fuse has the lowest I2t of any
branch circuit fuse to protect power semiconductor devices that
utilize diodes, GTOs, SCRs and SSRs. The DFJ fuse combines the
performance of high speed fuses in a full range Class J branch
circuit package, allowing the use of readily available Class J fuse
blocks, holders and switches. The DFJ uses standard Class J holders
and blocks.