Siemens 5SY6663-6 — SENTRON 4-pole MCB, 63 A, B curve
Installation depth is 70 mm. The quick-assembly fastening system and any mounting position simplify panel layout.
Thermal derating and environmental range
Rated 63 A at 35 °C; derates to 59.98 A at 40 °C, 58.4 A at 45 °C, 56.83 A at 50 °C, and 55.12 A at 55 °C. Pollution degree 3, overvoltage category III — standard for fixed industrial installations. Halogen-free and silicon-free construction.
Current production — no end-of-life notice. For BOM freeze or line-down replacement, this is a standard-catalog item with no special lead-time risk.