The Siemens 5SN6163-7CP is a SENTRON 5SN series miniature circuit breaker, 1-pole, C-curve. It's rated 6 kA breaking capacity per EN 60898 and 10 kA per IEC 60947-2 at 400 V AC, with a 72 V DC maximum. Single modular width (18 mm) on DIN rail, 70 mm installation depth, 76 mm overall depth.
The 6 kA rating per EN 60898 covers the residential and light commercial branch circuit fault duty. The 10 kA per IEC 60947-2 is the industrial rating — that's the number that matters when this breaker lands in a panel fed by a transformer with higher available fault current. The C-curve (trips at 5-10x rated current) is the standard choice for motor-starter and transformer inrush — not for resistive loads where a B-curve would do, but not for high-inrush drives where a D-curve is needed. Single-pole, 400 V AC line-to-line, 72 V DC maximum. At DC the arc extinction is harder; 72 V is the limit for this pole configuration.
Panel integration
Snap-on DIN rail mount, 18 mm width (1 MW). Accepts solid conductors up to 35 mm² — that's a 6 AWG equivalent, enough for the feed side on a sub-panel. Ambient range -40 to 75 °C covers unheated enclosures in cold climates and hot transformer vaults. 10 000 mechanical cycles typical — not a daily-switch duty, but fine for branch protection where it trips rarely.