The fuse ie the Lin and Lout terminals needs to be wired into the permanent live circuit between the isolator and the fan - not the switch lived circuit. I would connect it slightly different to Mr White but it makes no difference as long as the fuse is down stream of the isolator and in the permanent live circuit.
Fan manufacturers are cagey about whether local fuse protection is required. Vent axia initially insisted on it for a 1400+ bedroom build but then backed down when challenged. Safest option is to install local fuse but TP isolators with this built in arent yet common.
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