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. The B-curve means it trips between 3 and 5 times rated current (48–80 A), so it's the go-to for residential and light commercial lighting and socket circuits where inrush isn't severe.
What the ratings mean for fit
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 10 kA (EN 60898) and 20 kA (IEC 60947-2) ratings tell you it can interrupt a fault up to those levels without welding contacts or cascading upstream. 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. Wire range is 0.75 to 35 mm² solid or stranded — that's flexible enough for control wiring at the low end and feeder-size conductors at the high end, so you can use it as a main or branch breaker in a sub-panel. The combined top and bottom terminals with screw-type terminals (2.5–3.5 N·m torque) simplify daisy-chaining or busbar feed. At 18 mm wide (1 width unit), it snaps onto DIN rail in any mounting position. Depth is 76 mm, installation depth 70 mm. IP20 with connected conductors — fine inside a closed panel, not for wet locations. Ambient temperature range -25 to +45 °C, storage -40 to +75 °C.
Compliance and approvals
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.