Siemens 52PM9W2A Mushroom Head Push Button Switch

Siemens 52PM9W2A is a non‑illuminated, two‑position mushroom‑head push‑button operator designed for rugged, oil‑tight panel mounting. The red mushroom head measures 1.75 inches (44.5 mm) across and sits on a chrome‑plated die‑cast zinc bezel, part of the 52‑series 30 mm class. This momentary push button provides a 1NO/1NC contact configuration and is rated for up to 10 A at 600 VAC, enabling reliable start/stop and interlock functions in industrial control panels. The unit is described as watertight/oiltight and carries NEMA ratings for 1, 3, 3R, 4, 4X, 12, and 13, making it suitable for environments with oil exposure or washdowns. Applications include machine controls, safety circuits, and control panels where a robust red signaling push button is required without illumination. As a standard 52‑series operator, it fits common 30 mm pilot device mounting and is UL listed, offering a durable, compliant option for heavy‑duty industrial installations.