Is this fuse on a mains switch adequate?
Beware of the fault current ratings of pptc fuses .Say if you have 240VAC and the circuit wiring and the fuse has a resistance of say 1 ohm .The pptc fuse must interupt a prospective fault current of a whopping 240 amps .Double check your ratings ,most small pptc fuses will shatter despite having a say 265VAC rating.