Schneider Electric SK-4 Time Delay Attachment

Schneider Electric's 9999-SK-4 Time Delay Attachment is a mechanically operated timer accessory for Square D Type S contactors and starters (Sizes 00–7). It provides a single-pole, double-throw contact arrangement with one normally open and one normally closed contact, implementing a timed-on delay in the control circuit when the coil is energized. This timer attachment is intended for mounting on Type S devices and will not fit standard NEMA Sizes 0–2 enclosures; Sizes 3–7 enclosures provide the required mounting space. Use cases include sequencing and interlock coordination in motor-control panels and other control circuits where a defined delay after energization is required before the auxiliary contact changes state.