The Siemens 5SL6206-7YA is a 2-pole miniature circuit breaker (MCB) rated 230 V with a 6 kA breaking capacity, C-curve trip characteristic, and 6 A rated current. This is the part you spec into a 230 VAC branch circuit where you need overcurrent and short-circuit protection on both poles simultaneously — typical for single-phase sub-distribution or a two-wire control transformer secondary.
Snap-on DIN rail mount, standard 2-pole width (roughly 36 mm).