Looks like a variation on this model
which is a fairly basic unit and they were too cheap to even bother getting it certified.
On the plus side, 3x 18A rails should be fine, Fortron are one of the better PSU OEM's and if they know what it takes to meed the various bronze/silver/gold/platinum-certified PSU (of which they have many) then I'd be more inclined to believe them than several other manufacturers. I would imagine the lack of certification is just a cost-saving measure rather than a false claim.
My guess is that of the three 18A rails, one powers Motherboard and SATA connections, then you get a pair of PCI-e connectors on each rail giving you a total of 4 PCI-e power connectors; Pretty common for the PSU's in the 500-750W range.
I wouldn't stress about the PSU, but it looks like a model aimed at OEMs so I'd check that it comes with a full retail warranty and not just the 1-year one that so often accompanies models not aimed at the consumer channel.