Sunvic simmerstats, these replacement units are used on electric boilers for controlling the temperature. They are 13A rated at 240vac and have a 4.7mm shaft. Available with or without a control knob.
These will replace all the other models such as TYJ6203, TYJ6202, TYJ0B1, TYJ6203, TYJ01A, TYJ6219, TYJ02B, TYJ6333. The alternative that can also be used is the EGO brand click here.
Example connection from older models: Line to P1, Neut to P2, Load to 4, (follow that wire back to element) take the other element wire, and connect to 2.