Allen-Bradley 840-DS1 Automatic Float Switch

Allen-Bradley 840-DS1 Automatic Float Switch is a Style DS, general-purpose float switch in the 840 family that uses a buoyant float to actuate its internal contacts as liquid level changes. The DS1 variant is intended for sump operation only and features a low operating force, a Type 1 enclosure, and standard contacts, making it suitable for indoor general-purpose installations in industrial environments. It senses liquid level in sumps and drives pumps or signaling devices through a control circuit when preset high or low levels are reached. This automatic float-actuation provides straightforward level control without additional actuation hardware, and its compact enclosure supports retrofit into existing sumps and control panels while remaining compatible with common wiring practices.