The Siemens 5SY4116-6XX03 is a SENTRON 5SY4 miniature circuit breaker — 1-pole, 16 A rated current, B-curve trip characteristic. It handles 400 V AC nominal, with breaking capacities of 10 kA per EN 60898 and 20 kA per IEC 60947-2.
16 A at 400 V AC is the standard rating for a 1-pole branch circuit on a 230/400 V three-phase system. The B-curve avoids nuisance tripping on modest motor or transformer inrush, but won't ride through heavy inductive starts — that's a C- or D-curve job. The IEC 60947-2 rating at 20 kA gives you headroom for industrial panels with high available fault current. UL 1077 listing at 5 kA covers North American supplementary protection applications. The combined top and bottom terminals with screw-type terminals (2.5–3.5 N·m torque) simplify daisy-chaining or busbar feed. Ambient temperature range -25 to +45 °C, storage -40 to +75 °C.
Rated per EN 60898 (10 kA) and IEC 60947-2 (20 kA), with UL 1077 / CSA C22.2 No. 235 at 5 kA. Overvoltage category III. Halogen-free and silicon-free construction. Sealable for lockout/tagout. Touch protection feature included. The part is classified per DIN EN 81346-2 as function code F.