Carrier HH12ZB330 Limit Switch 322055-301 the 4074EGR is identical to

the 4074EGR is identical to the 4074EGR/U

and 38HQ680014

Durable Construction: Built for industrial HVAC automation

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

Maintenance Efficiency: Features replaceable check modules and a union inlet

Carrier HH12ZB330 Limit Switch 322055-301 the 4074EGR is identical toThe 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