This is a brand new OEM Goodman/Amana Upgraded Furnace Limit Switch. The switch is rated at 140 degrees (L140-30F).
A limit switch is a safety device designed to shut down a piece of equipment. Limits have a set point, which is in some cases, adjustable. The set point prevents the temperature or pressure from exceeding the rating of the switch.
B1370205 B13702-05