This Sterling HVAC limit switch is a safety device designed to detect the presence or absence of a mechanical force or motion.
It operates at a fixed point, determined by the temperature settings of 190 °F (on) and 30 °F (off).
When the temperature reaches 190 °F, the switch activates, and when it falls to 30 °F, it resets.
This component is typically used in heating, ventilation, and air conditioning (HVAC) systems to prevent overheating by interrupting the electrical circuit when a predetermined temperature is exceeded.