551-0407 is a 3mm red LED circuit board indicator (CBI) designed for direct PCB mounting with a 0.200" high LED centerline. This high-efficiency LED features a peak wavelength of 650 nm and delivers 10 mcd luminous intensity at 10 mA test current, with a forward voltage of 2.0 V. The indicator has a 45° viewing angle and is housed in a UL 94 V-0 rated black polymer (PBT) enclosure with stand-offs that facilitate PCB cleaning. Multiple CBIs can be arranged horizontally on 4.45 mm (0.175") center-lines to form LED arrays, making it ideal for status indication, panel displays, and instrumentation applications where compact, reliable visual feedback is required.