Siemens 5SY7663-7 — 63 A 4-Pole C-Curve MCB, Current Production
The C-curve trips between 5× and 10× In, so at 63 A that's 315–630 A magnetic trip — sized for motor-starting inrush or moderate transformer loads where a B-curve would nuisance-trip, but not as high as a D-curve for heavy inductive kicks.
Temperature Derating & Ambient Limits
Full 63 A rating holds at 35 °C ambient. At 45 °C it derates to 58.4 A, at 50 °C to 56.83 A, at 55 °C to 55.12 A, and at 60 °C to 53.42 A. The maximum operating ambient is 75 °C, minimum -40 °C — wide enough for unheated enclosures in northern climates or hot machine cabinets. Humidity limits: max 95% up to 55 °C, tapering to 55% at 70 °C and 35% at 75 °C.
Installation & Panel Fit
Depth 76 mm, width 72 mm (4 modular width units), height 90 mm, installation depth 70 mm. Sealable, halogen-free, silicon-free construction.