The 0HPGMT05R panel is rated for 15A GMT fuses on the outputs due to the internal wiring and heat ratings. While a higher rated GMT fuse will fit into the GMT slots, and allow connected equipment to be powered it is not recommended. Using a GMT fuse with a rating higher than 15A could cause internal damage to the panel, and void the warranty.  

The panel has the maximum fuse rating silk screened on the front of the chassis, which is 15A.