What this breaker is and where it lands
The Siemens 5SP4191-7 is a 1-pole SENTRON miniature circuit breaker with C-curve trip characteristic, rated 100 A at 400 V AC with a 10 kA breaking capacity per EN 60898.
C-curve and 100 A — what that means on the line
The C-curve trips at 5 to 10 times rated current (500 to 1000 A for this 100 A unit), which makes it a fit for general-purpose loads with moderate inrush — lighting banks, small motor groups, resistive heaters, and distribution feeders. It's not for high-inrush transformer primaries (that wants a K or D curve) or for sensitive electronics (that wants a B curve). The 100 A rating on a single pole at 400 V AC means it's typically used as a branch-circuit protector in a three-phase panel where each phase gets its own 1-pole breaker, or as a single-phase main.
DIN-rail fit and panel integration
Width is 27 mm (1.5 MW), depth 76 mm, height 90 mm, with an installation depth of 70 mm into the panel. The tunnel terminals top and bottom accept standard copper conductors. Sealable design means the toggle can be locked in the off position for lockout/tagout compliance.