The Barber Colman AK-42309-500 is a "Positive Positioner Pneumatic Relay." This is a high-ticket item compared to standard relays because it’s a specialized industrial component used to accurately position valve and damper actuators.
Since Barber Colman was acquired by Schneider Electric, you will often see this listed under both brands.
Genuine Barber Colman (Schneider Electric) AK-42309-500. Direct-acting pneumatic relay for accurate actuator positioning. Includes mounting linkage. Replaces AK-42309 and AK-52309.
Compatible with MK-2690, MK-3XXX, MK-44XX, MK-66XX Actuators
