The Siemens SENTRON 5SY8415-8 is a 4-pole miniature circuit breaker rated 1.6 A with tripping characteristic D, designed for AC systems at 50/60 Hz. Rated 1.6 A at 45 °C ambient, derated to 1.57 A at 50 °C and 1.53 A at 55 °C — so no margin squeeze in a warm enclosure if you stay within the thermal derating curve. The 4-pole construction (4P, no switched neutral) means all four poles protect the three phases and one neutral; if your panel requires a separate neutral bar, note the absence of integral neutral switching.
IP20 with connected conductors; install behind a panel door or inside a cabinet to keep the live terminals out of reach.
Environmental and compliance profile
Rated for -40 °C to 75 °C ambient, with humidity tolerance up to 95% at 55 °C. Halogen-free and silicon-free construction means no corrosive off-gassing in a sealed enclosure — relevant for panels in clean rooms or near sensitive electronics. Degree of pollution 3 (conductive pollution typical in industrial environments) and overvoltage category III (fixed installation, not downstream of a transformer). Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — survives the vibration on a machine skid.