The Trane SWT2173 Rollout Switch (SKU: SWT02173) is a critical OEM furnace safety component designed to break the 24V control circuit when it detects flame rollout or excessive heat at the burner box

Proper installation involves verifying the L190-30F specifications to match the original equipment manufacturer’s requirements for airflow and heat rise safety

and Series 3-CT versions

Designed to withstand the demanding pressures of industrial process steam

By providing 10 seconds of minimum time-delay at 500% of the rated current

Schneider Electric (Barber Colman) 2378-501 Relay Els PW 17895 The Trane SWT2173 Rollout SwitchThe Schneider Electric (Barber Colman) 2378 501 Relay is a high performance pneumatic amplifying relay designed for proportional signal control in HVAC systems. Engineered as a Pneumodular component, this device provides a definitive 2: 1 amplifying function, doubling the input signal pressure to the branch line. This is essential for contractors managing larger actuators or terminal units that require higher pressure than the standard controller