The Siemens 5SY4515-8 is a SENTRON miniature circuit breaker with a D tripping characteristic, rated 1.6 A at AC, designed for 2-pole (1P+N) circuits on 50/60 Hz supplies.
Thermal derating and ambient range
The 1.6 A rating holds at 35 °C; at 45 °C it derates to 1.48 A, at 50 °C to 1.44 A, at 55 °C to 1.4 A, and at 60 °C to 1.36 A. The operating ambient spans -40 °C to 75 °C, with humidity limits up to 95% at 55 °C, tapering to 35% at 75 °C. That covers cold storage and desert installations alike.
Mounting position is any — vertical, horizontal, upside-down — so no panel layout restrictions. The combined terminal at top and bottom accepts the same conductor range, and the breaker is sealable for tamper-proofing in metering or critical circuits.
Materials and compliance
Halogen-free and silicon-free construction means no corrosive off-gassing under fault — relevant for cleanroom-adjacent panels or sealed enclosures with sensitive electronics. The IP20 rating applies with connected conductors; the breaker itself is touch-protected (fingertip-safe) per the product feature. Classified as F per IEC 81346-2 and DIN EN 61346-2. Suitability for mechanical engineering and industry is stated on the listing.