Description
Ensure the safe and reliable operation of your furnace system with the genuine Carrier HH12ZB190 high limit switch. This factory authorized component is engineered to exact standards and provides essential temperature cut off protection to keep your heating system operating within safe limits.
Key Features
- Designed to open at approximately 190 °F (cut out) and reset/closes at about 150 °F (cut in) — known as the “L190 40” differential.
- Auto reset type: returns to the closed state when temperature drops below the reset threshold — eliminating manual resetting.
- 3″ insertion / 3 inch probe style mounting for many furnace applications.
- Compact, durable construction built for years of safe operation in heating systems.






