The Siemens 5SY4116-8CC11 is a SENTRON miniature circuit breaker rated 16 A at 400 V AC with a D tripping characteristic and a 10 kA breaking capacity per EN 60898. The D curve means it tolerates high inrush currents — typically specified for motor circuits, transformers, or welding equipment where the startup surge would nuisance-trip a B or C curve. Breaking capacity at 10 kA is the standard domestic and light commercial fault level; if your prospective short-circuit current exceeds that, you need an upstream current-limiting device or a higher-rated breaker.
Panel fit and environment
At 18 mm wide (1 MW), this single-pole breaker snaps onto a DIN rail via the quick-assembly system. The 76 mm depth and 70 mm installation depth leave room for wiring in a standard 100 mm deep enclosure. Terminals accept 0.75 to 35 mm² solid or stranded — that's a wide range, covering both control-circuit wiring and larger feeder conductors. Screw terminals torque to 2.5 to 3.5 N·m. IP20 with connected conductors means the busbar area is finger-safe once wired, but the breaker itself is not sealed against moisture; keep it inside a panel rated for the environment.