Siemens 52PL4U2 Pilot Light

Siemens 52PL4U2 is a red LED pilot light designed for front-panel indication in control cabinets, automation panels, and machinery. This panel-mount indicator uses a built-in LED lamp and supports a broad supply range of 24–240 V, enabling reliable operation from common industrial power sources. The red lens is plastic, providing clear visibility, and the unit is listed as part of Siemens' 52-series family of LED pilot lights. Typical applications include signaling run/stop status, fault indicators, and general status annunciation in electrical control panels where a conspicuous red signal is required. The model is sold under catalog numbers such as 52PL4U2, with related variants like 52PL4U2P appearing in distributor listings, reflecting Siemens' standardized panel-light design across the 52 line. With its integrated LED, the 52PL4U2 delivers low power consumption while providing reliable panel indication in a variety of industrial environments.