The 5SY4425-8: The D curve targets loads with high inrush current — motor starters, transformer primaries, and solenoid banks — delaying trip above the nominal during start-up.
The 5SY4425-8 is classified as current production — no last-time-buy window or end-of-life notice. It remains a standard line item, orderable through normal Siemens distribution with no supply constraint. For a critical-spare holding, one in the cabinet covers the 4-pole 25 A D-curve slot common to many European-derived panels.
Integration & derating
Depth is 76 mm behind the panel, plus 90 mm height with combined top and bottom terminals. Sealable, halogen-free, and silicon-free construction suits cleanroom-adjacent or hygiene-conscious installations.