Schneider Electric (Barber Colman) 2378-501 Relay Els PW 17895 It is technically identical to

It is technically identical to the 11J38R06890-002 and serves as a high-durability sensing rod engineered to withstand the high-temperature environment of the burner assembly

not the switch

The Schneider Electric (Erie) AH13B020 Actuator is a field-proven 120V PopTop zone valve actuator engineered for precise two-position control in commercial and residential hydronic systems

it ensures optimal hydraulic balancing and energy efficiency by regulating hot or chilled water flow

Rated for a set point of 4

Schneider Electric (Barber Colman) 2378-501 Relay Els PW 17895 It is technically identical toThe 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