The 5SY4102-8: The D characteristic is the key selector: it's the correct choice when the load draws a high magnetizing or charging current on startup — think small motors, solenoid banks, or capacitor banks. A C-curve would nuisance-trip on those loads; a D-curve holds through the spike and clears only on sustained overload or short-circuit. The 10 kA EN 60898 rating is the standard for final circuits in most IEC distribution boards; the 35 kA IEC 60947-2 rating applies when the MCB is used as an industrial circuit breaker with higher prospective fault current — for example, in a panel fed by a large transformer. On the DC side, it's rated 15 kA at 60 V, which covers many control-circuit and battery-string applications. The 1-pole format occupies one 18 mm modular width on the DIN rail.
Deployment context
The 18 mm width means it fits any 1-module slot in a distribution board or enclosure.