Carrier HH18HA452 Rollout Switch While designed for Johnson Controls

While designed for Johnson Controls T-4000 hardware

What causes a 144°C thermal cut-off fuse to blow

This component is cross-referenced and is physically identical to the Lennox 47K0901

Key Benefits Automatic Reset: Eliminates the need for manual restarts after the system cools to safe parameters

Carrier HH18HA452 Rollout Switch While designed for Johnson ControlsThe Carrier HH18HA452 Rollout Switch is a critical safety component designed for furnace flame rollout protection in high efficiency gas fired heating systems. This SPST (Single Pole Single Throw) limit switch is engineered to open the electrical circuit when it detects excessive heat concentrations, indicating a potential draft issue or heat exchanger compromise. Operating with a fixed temperature trip point of 250 degrees F, this manual reset