Eaton NSB E34FPB297L Occupancy Switches Prestest

The Eaton NSB E34FPB297L Occupancy Switch (Prestest) is an automatic lighting-control device that activates or deactivates a circuit based on occupancy, enabling hands-free operation in spaces where lighting should respond to presence. The unit carries NEMA enclosure ratings 3, 3R, 4, 4X, 12, and 13, indicating it can be used in a range of environments—from standard indoor installations to more demanding settings with moisture, dust, or exposure to washdown conditions. This part number, E34FPB297L, sits within Eaton’s NSB lineup, and Prestest appears as part of the product’s designation in the listing. Occupancy switches like this are commonly used to improve energy efficiency by reducing unnecessary lighting when spaces are unoccupied, while preserving reliability and safety in applications that require durable enclosure protection.