Siemens SENTRON 5SY7208-7 — 2-pole C-curve MCB, 8 A, 15/30 kA
Temperature derating and ambient limits
The 8 A rating holds at 35 °C. Above that, derate linearly: 7.51 A at 40 °C, 7.26 A at 45 °C, 6.99 A at 50 °C, 6.72 A at 55 °C, and 6.43 A at 60 °C. Humidity must be managed: max 95% RH up to 55 °C, dropping to 35% RH at 75 °C.
Mounting position is unrestricted — vertical, horizontal, or inverted — which simplifies layout in crowded enclosures. Sealable design allows lockout/tagout for maintenance isolation.
Dual-rated to IEC/EN 60898-1 (15 kA) and IEC/EN 60947-2 / UL 1077 (30 kA). The UL 1077 listing means it qualifies as a supplementary protector in North American panels, not a branch-circuit rated device — important for UL 508A industrial control panels. Halogen-free and silicon-free construction. Energy limitation class 3. Designation per EN 61346-2 and IEC 81346-2 is F.