What the 919991284 is
The Molex 919991284 is a 4-circuit single-row latch-lock header in the Appli-Mate 91999 series, with male-blade pins sized for through-hole solder mounting on a 5.00 mm pitch. The housing is natural PA66 (Nylon 6/6) and carries a board guide feature that keys the header into the PCB during assembly — useful on production lines where pick-and-place accuracy varies across panelised boards.
Current and voltage ratings
Where Appli-Mate headers are used
Appli-Mate is Molex's industrial-automation power connector range — these headers sit on PCB edges inside motor drives, relay modules, and distribution blocks where a latch-lock mate beats a friction-fit for vibration-prone enclosures. The board guide is a tell: it's a production-aid feature for panelised assembly, not a field-service design.