The Siemens 5SY8605-8 is a SENTRON miniature circuit breaker with a D tripping characteristic, 4 poles (3P+N), rated for AC operation at 230/400 V and 50/60 Hz. It interrupts fault currents up to 70 kA per IEC 60947-2 and 15 kA at DC per the same standard; under UL 1077 the interrupting rating is 5 kA.
Top and bottom combined terminals simplify busbar and outgoing wiring. Neutral conductor is switched internally (3P+N design).
Rated for ambient temperatures from -40 °C to 75 °C, with humidity limits of 95% at 55 °C, 55% at 70 °C, and 35% at 75 °C. Pollution degree 3, overvoltage category III. Halogen-free and silicon-free construction. Sealable for tamper-evident installations. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.