Siemens 5SY6613-8 — 4-pole D-curve MCB, 13 A, 400 V AC
It's built for industrial panel applications where high inrush currents from motor or transformer loads need a D-curve to avoid nuisance tripping on startup. UL 1077 / CSA 22.2 No. 235 rating is 5 kA, so it's accepted in North American branch-circuit-listed panels too.
The 15 kA IEC 60947-2 rating gives headroom for selective coordination with upstream feeders in a typical 400 V industrial distribution. Ambient temperature range -25 to +55 °C, with derating above 40 °C per the thermal curve. Storage range -40 to +75 °C.
Panel integration
Height 90 mm, width 72 mm (4 TE). Sealable with a lockable cover for tamper-proof isolation. Touch protection is built in. Halogen-free and silicon-free construction — important for environments where outgassing can contaminate sensitive contacts or optics. Mounting position any orientation, so it's flexible for tight enclosures.