Re: Non-Fused Disconnects and 110-10
From the Square D Digest:
"Not Fusible Safety Switches
Any brand of circuit breaker or fuse not exceeding the ampere rating of the switch may be used ahead of an unfused safety switch when there is up to 10,000A short circuit available.
Above 10,000A - When applied on systems with greater than 10,000A short circuit available, the UL Listed short circuit current rating for SQUARE D unfused switches is based upon the switch being used in conjunction with fuses or SQUARE D circuit breakers or MAG-GARD circuit protectors."
Just because you can, doesn't mean you should.