The Siemens 5SL4302-8CC is a 3-pole miniature circuit breaker rated 400 V with a 10 kA breaking capacity, D-curve trip characteristic, and a 2 A current rating. Lifecycle stage is current.
The D-curve (10–20× In magnetic trip) is what you want for motor-starting or transformer inrush loads that would nuisance-trip a B or C curve. At 2 A, it's sized for small inductive circuits — think contactor coils, relay banks, or a single small motor on a 400 V line. Snaps onto standard DIN rail, so it swaps in like any 1-module-wide MCB.