The Siemens SENTRON 5SY7216-8 is a 2-pole miniature circuit breaker with a D tripping characteristic, rated 16 A at 35 °C and 400 V AC. It delivers a 15 kA breaking capacity per IEC 60898 and 25 kA per IEC 60947-2, making it suitable for high-inrush loads like motor circuits and transformers where the D curve avoids nuisance tripping on startup.
The 15 kA rating under IEC 60898 covers standard domestic/commercial fault levels, while the 25 kA under IEC 60947-2 gives headroom for industrial panels with higher prospective short-circuit currents. The D curve (10–20× In) is the key difference from a C-curve sibling — it handles the magnetizing inrush of motors, welders, or UPS systems without dropping the load.
Environmental range and derating
Rated for ambient temperatures from -40 °C to 75 °C, with a derating curve provided: at 45 °C the continuous current drops to 14.51 A, at 50 °C to 13.98 A, at 55 °C to 13.44 A, and at 60 °C to 12.86 A.