The Siemens SENTRON 5SY5216-6KK11 is a 2-pole miniature circuit breaker with B-curve tripping characteristic, rated 16 A at 35 °C and 10 kA breaking capacity per EN 60898. It occupies 2 modular width units (36 mm) on a DIN rail, with 76 mm depth and 70 mm installation depth — standard footprint for a 2P MCB in a distribution board. Rated for universal current (AC/DC) with 440 V DC maximum, so it handles DC control circuits as well as AC branch circuits. Breaking capacity is 10 kA at both AC (per EN 60898) and DC (per EN 60898-2). That's the standard domestic/light commercial fault level — adequate for most sub-distribution boards, but check your upstream transformer impedance if the prospective short-circuit current exceeds 10 kA.
Temperature derating and real-world current
The 16 A rating holds at 35 °C ambient. Above that, derate linearly: 15.23 A at 40 °C, 14.83 A at 45 °C, 14.43 A at 50 °C, 14 A at 55 °C, and 13.57 A at 60 °C. The -40 °C to 75 °C operating range covers cold storage and hot roof spaces.