Schneider Electric 8501-DD0-22 Time Delay Relay

Schneider Electric Square D 8501-DD0-22 Time Delay Relay is a discontinued pneumatic time-delay timer accessory in the 8501 family, designed to add a controlled delay to legacy control circuits by means of a pneumatic timing mechanism. It provides one normally open and one normally closed contact and is driven by a 110/120 VAC coil, enabling timed switching actions within electrical control panels. As a discontinued part, 8501-DD0-22 availability is generally limited to surplus stock or distributors, and Schneider Electric no longer manufactures this specific model. The 8501 family historically encompassed timing relays and accessories—such as 8501XO/XDO timing variants and related plug-in timing products like 9050 and JCK timers—illustrating Schneider Electric's longstanding focus on flexible, legacy timing solutions for industrial controls.