Schneider Electric 311AS Time Delay Attachment

Schneider Electric's 311AS Time Delay Attachment is a pneumatic time-delayed accessory designed to extend the functionality of Square D/Schneider TeSys Deca contactors. It provides an on-delay timing function from 0.1 to 30 seconds, with a set of two changeover contacts: one normally open (NO) and one normally closed (NC). The unit terminates through screw-clamp terminals for straightforward wiring and reliable field installation, making it a compact, plug-in timing accessory for compatible contactors. By introducing a controlled delay after the coil is energized, this attachment helps sequence operations, prevent simultaneous start-up, and improve interlock logic in control circuits. Typical applications include motor-start sequencing, step-wise control in automation panels, and other timing-dependent tasks where precise 0.1–30 s delays are required. Built for durable panel use, the 311AS integrates with the TeSys Deca family to deliver predictable timing without requiring extensive rewiring or separate timer modules. Its compact form-factor and time-delay accuracy support reliable integration into industrial control schemes, providing a simple, proven way to add delay logic to existing contactor-based controls.