Silly question about a KSA 250-Fuse


Sorry for the silly question but does anyone have any advice on how to change the rear ac fuse? Can't seem to turn it. Theres a round, ribbed inset that looks like it should turn but isn't. Thank you in advance. 
Ag insider logo xs@2xduran
Did you push it in and turn it?
Yep tried that, still won't budge. Thanks for the tip though. 
From the user manual..............................................................................

  G. WARRANTY AND SERVICE INFORMATION There are no fuses or user-serviceable parts in the KSA-150 or KSA-250. Both amplifiers have a limited warranty of five years from the date of purchase for parts and labor.
@ duran


Is this a picture of the back of the amp?
https://www.ebay.com/itm/192768389378

If so that is not a fuse holder. It is a 20 amp circuit breaker. If it trips you push in on it to reset it.

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the ksa series doesn’t come with an external fuses. It is a breaker which will trip when the amp detect a problem. You need to push in to reset.

Internally it does come with two fuses which are both soldered to a circuit board. Hope this help.
Jea48 yep that's the back. Thank you all for the responses. I'll try that when I get home.