Fusing an In-Wall LED Application
You can use a higher voltage rating fuse.

The schematic needs improvement. PTC is too slow to protect LEDs from overcurrent. Using a PTC to limit LED current is not as straightforward as it might seem. You need to add series resistor to limit the current. You can use a &quot;led resistor calculator&quot; for the values. For example:
http://www.ohmslawcalculator.com/led-resistor-calculator


In your circuit depending on exact components you are wasting around 20 % on the series resistors. Consider using a dedicated LED driver, that adjusts the current or use a higher voltage and have several LEDs in series, so that smaller percentage of voltage is left over the resistor.