Siemens 8WD4420-5AB Sirius Continuous Light Element

Siemens SIRIUS 8WD4420-5AB is a red continuous-light element with an integrated LED designed for signaling columns in industrial environments. This 70 mm-diameter unit (65.5 mm high) mounts into modular 8WD4 signaling columns via bayonet fitting and operates from 24 V AC/DC, drawing up to 40 mA, with an IP65-rated polycarbonate enclosure to withstand dust and water jets and an operating temperature range of -20 to +50 C. The built‑in LED delivers continuous red illumination with a typical luminous intensity of 0.79 cd and a range of 0.53–1.41 cd, and it is rated for up to 100,000 hours of service life; its MTTFd is listed at about 8,781 years, underscoring reliability in demanding industrial settings. In addition to signaling columns, this element is used to provide a clear status or warning signal as part of the SIRIUS signaling system for process control and visual warning applications.