Siemens 5SY6525-6 — 25 A B-Curve MCB for Panel Protection
It carries dual breaking capacity: 6 kA under IEC/EN 60898-1 and 15 kA under IEC 60947-2 / UL1077, meaning it can interrupt fault currents up to 15 kA in industrial distribution panels where the higher standard applies.
The 25 A rating at 35 °C derates to 23.48 A at 40 °C, 22.68 A at 45 °C, 21.85 A at 50 °C, and 21 A at 55 °C; if the panel ambient runs above 35 °C, the connected load must be reduced accordingly. The 2 MW unit width (36 mm) and 76 mm depth let it drop into standard DIN-rail panels; the quick-assembly fastening method and any-position mounting simplify rail integration.
The breaker is certified to IEC/EN 60898-1 and IEC/EN 60947-2 / UL1077, covering both household-style and industrial breaking-capacity ratings. It is halogen-free and silicon-free, and the sealable design supports lockout/tagout procedures.