NATIONAL 448544 Miniature Water Switch Snap Action SPDT 5A – 6676

The National 448544 is a miniature snap-action water switch, SPDT configuration rated for 5 A. It is typically used as a sensor or interlock component in medical equipment where water presence or absence must be detected—for example, in cooling systems, humidifier circuits, or safety cutoff logic. The switch uses a snap-action mechanism to provide reliable contact closure and is installed as a discrete component on equipment boards or within fluid-path assemblies.