Where is fuse for Carbon monoxide detector in 2001 330 express

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Express 330
Looking for fuse for carbon monoxide detector I already removed cabin electrical panel, not there.
 
My understanding is that a powered CO detector must not be connected to a switched circuit. That means that it would be wired directly to a battery and the ABYC specs state that ant feed like that, connected at the battery must be fused near the battery ( within something like 16 inches)
As you are probably aware, auto bilge pumps are wired directly to the batter and have in-line fuses also. Often those fuse holders at screwed to the battery compartment wall close to the battery.
You may see a few of these in-line fuses for various devices that require constant power.

If you need to change your detector, there are models that run on a battery and last 7 years. Even the DC powered models have a limited life. Some folks use less expensive residential models but I can't recommend that option. The environment on a boat is a lot harsher than a bedroom in your home.
 
OK Update - It was behind the cabin electrical panel - it was a small inline fuse not marked.
 
i could never find mine in my ‘06 330 Express. would you have a pic of where exactly the fuse is.
 
Here you go. Fuse is directly behind the electrical panel in cabin. Inline fuse holder with blue wire. This is on 2001 330 express
 

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I wondered about that also on my 2003 330 - thanks. As an aside comment - the CO2 sensor will also start intermittent beeping when battery power is getting low. It's my warning alarm to turn on the generator when I'm on a mooring!