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I would call SCC in the morning if no one can answer tonight. They carry the supply and can check for you.

Think maybe Shotgun has it too...I'll holler.

The part # on mine is simply 6A250V

I also don't understand 6A in a 15 amp supply, but perhaps it's to do with the 250V?

As for no customer service from PM, have you tried calling them? Sometimes people get to busy to answer emails.
In most businesses, walk-in customers or those calling usually get priority over emails...

I know nothing about this power supply, but the fuse is probably on the 120 volt input, not the output.
It's a time delay (T) 6 amp (6) 250 volt (250) fuse. Nothing magic about it. Go to the hardware store.
Don't jack around with the ampere rating.

If you have a linear power supply it has a transformer and the line fuse is normally located between the power cord and the transformer. The transformer is used to drop the voltage and the power going into the transformer is the same (minus a small loss) as the power out. Power is volts X amps. If you step down the voltage the amps at the output side of the transformer will be greater than the amps on the input side where the fuse is located. A power supply rated at 15 amps is not likely to have a 15 amp fuse for that reason. My 20 amp Pyramid power supply has a 6 amp fuse.
One of these days I will have to figure out how a switching power supply works.

I have always looked at the fuse rating as not about the amperage delivered by the power source but rather the delicateness of the downstream electronic circuitry that you are trying to protect.

The fuse in the power supply is only intended to protect the power supply itself, if you really want to protect your wiring, controllers and cars you should have a much lower value fuse or breaker for each lane.