The 5SL3106-6MB: The B-curve trips between 3 and 5 times rated current (18–30 A magnetic), so it's sized for resistive and general-purpose loads where inrush isn't heavy — lighting circuits, small control transformers, office wiring. The 4.5 kA breaking capacity at 400 V AC covers most residential and light commercial fault levels; if your panel's prospective short-circuit current is higher, step up to a 6 kA or 10 kA frame. The 6 A rating at 30 °C ambient is the continuous current you design to; derate if the enclosure runs hotter.
IP20 with conductors connected, so it's for enclosed panels only, not washdown areas. Mounting position any, which helps when you're squeezing breakers into a tight gland-plate layout. The sealable design lets you lock the toggle position after commissioning.