Carrier 319820-301 Blower Cutoff R-407C this auto-reset limit control provides

this auto-reset limit control provides highly responsive thermal monitoring compared to standard non-assisted switches

the MK-6621 features a built-in adjustment nut that allows you to shift the start point by ±2 PSI to synchronize multiple actuators or compensate for line losses

this Resideo OEM replacement part ensures consistent flow control and prevents actuator burnout

it provides efficient operation with a pressure differential range of 5 to 125 PSI

Verify the part number on the existing PCB or cross-reference the 100187861 legacy number

Carrier 319820-301 Blower Cutoff R-407C this auto-reset limit control providesThe Carrier 319820 301 Blower Cutoff is a critical OEM replacement part designed for high efficiency residential furnaces and air handlers. Also known as a blower cutoff plate, this component is engineered to maintain precise static pressure and optimize airflow patterns within the blower housing. By preventing air recirculation and controlling discharge when the motor is inactive, it directly improves HVAC system efficiency and protects the blower