Schneider Electric's Square D 9999-PTD30 Time Delay Relay is a pneumatic timer module designed as a timing accessory for Square D 9999-series contactors, introducing a defined delay in control circuits. The PTD30 variant provides a 30-second timing interval and is part of the 9999PTD30/180 family, which also includes a PTD180 option for longer delays. This timer module is used to sequence operations such as starter control and interlocks, enabling controlled startup or staged switching in industrial automation applications.
