This 3-inch blade is typically found in specific power-vented units where space is a constraint

this furnace limit control provides essential circuit interruption to prevent damage and maintain system integrity

For standard 24 VAC control circuits

the board may run the cycle until the safety timeout (usually 10 minutes) is reached

While similar in function

Belimo ZG-TF2 Adaptor Kit This 3-inch blade is typicallyThe Belimo ZG TF2 Crankarm Adaptor Kit is a field proven solution for damper actuator retrofit applications where direct coupling to the damper shaft is physically obstructed or impossible. Specifically engineered for the Belimo TF series actuators, this kit enables seamless integration of TFB(X) spring return actuators into existing mechanical linkages, effectively replacing legacy foot mounted, crankarm style units from Honeywell, Johnson Controls,