Carrier HH12ZB330 Limit Switch 322055-301 Rugged Hardware: Cast bronze construction

Rugged Hardware: Cast bronze construction and brass seats are engineered to withstand the thermal stresses of steam and hydronic HVAC cooling and heating

the 4074EGR is identical to the 4074EGR/U

The switch utilizes a snap-disc mechanism that is factory-calibrated to cut power to the gas valve or heating elements when the internal plenum temperature reaches a 150

and 38HQ680014

it protects internal components in demanding industrial environments while providing a "Sight-Set" calibrated scale for visible adjustments without removing the enclosure

Carrier HH12ZB330 Limit Switch 322055-301 Rugged Hardware: Cast bronze constructionThe Carrier HH12ZB330 is a critical safety component designed for high temperature furnace and HVAC applications. This 300 330F auto limit switch functions as a primary thermal protection device, monitoring internal heat levels to prevent heat exchanger damage or unsafe operating conditions. As an OEM Carrier replacement part, it ensures factory spec calibration and reliability, which is essential when troubleshooting rollout issues or overheating