That looks like ratings for a motor or motor controller, full load and locked rotor are motor operating characteristics. Not really sure how it's relevant to a thermostat. It doesn't seem like a thermostat rating because the full load amps would only supply 500w of heat. You need to provide more details about where you see that label, and maybe the front or back of the thermostat.
A line (high) voltage stat will have wires at least as thick as spaghetti, the terminals will be marked Line and load, or L1,L2 and T1,T2. There will be a junction box behind the thermostat. A line voltage thermostat will normally control 1 or 2 baseboards or wall mounted units of some type.
Typically a low voltage thermostat is just connected to phone size wires comng through the wall and the stat will just be screwed to a cheesy little plate screwed to the wall. The terminals will be marked with letters like r,h,y,w,g. If you have gas or oil heat it is almost certainly a low voltage stat.