Arc flash incident energies can often be significantly reduced by simply replacing UL Class RK5, Class K, and Class H fuses with A6D UL Class RK1 fuses. This is an easy and inexpensive solu¬tion, since the A6D fuses fits into the same fuse holders. Please note that Class H fuses are not current limiting and have a very low interrupting rating. If there are any of these left in your system you should plan to retire these as soon as safely possible.

Upgrading to A6D Class RK1 fuses can reduce arc flash energies because these fuses have lower let-through energies in their current limiting range and lower current limiting thresholds.