Ceramic keeps blowing fuses

[u/Greglebowski74]

I came back from a few days away to find no heat in my snake's vivarium. I checked the thermostat and there was no light on. I checked the plug, the switch, but still nothing. So I tried a new fuse. It came on, but within a few seconds it blew the fuse. I took the ceramic out of its fitting, but it all seemed ok. Another new fuse, another blow. Any ideas what might be up? It's a Habistat thermostat, but I'm not sure what brand the ceramic is. It came with the vivarium.