The Siemens 5SY3016-6 is a SENTRON miniature circuit breaker rated 16 A with B tripping characteristic, 1P+N poles, and a 4.5 kA breaking capacity per EN 60898 at 230 V AC.
At 16 A, it protects a 3.7 kW resistive load on a 230 V single-phase line. The 4.5 kA breaking capacity is the maximum fault current it can safely interrupt under EN 60898; that's adequate for most domestic and light commercial distribution boards, but if your panel's prospective short-circuit current exceeds 4.5 kA, you need a higher-rated unit like the 6 kA variant. The 1P+N configuration switches the phase and the neutral — the neutral is not just a solid link but a switched pole, which matters for isolation during maintenance. Rated for 230 V AC single-phase operation, overvoltage category III, so it's suited for fixed-installation distribution boards downstream of the utility meter.
Mounts on standard DIN rail, any position. Screw terminals accept 0.75 to 16 mm² solid or stranded copper — that's a wide range covering 1.5 mm² lighting circuits up to 10 mm² feeders. Tightening torque is 2 to 2.5 N·m (17.7 to 22.1 lbf·in).