What it is and what it does
The ABB S202M-D16 is a 2-pole miniature circuit breaker from the S200M series, with a D-characteristic trip curve rated at 16 A. It carries a UL1077 listing, meaning it is recognized as a supplementary protector for branch circuits in North American panels, not as a branch-circuit overcurrent device. The D-curve (10–20× In) is sized for loads with high inrush, typically motor starters, small transformers, or solenoid banks.
Panel integration note
Snap-on DIN rail mount, 2-pole width (36 mm at 18 mm per pole). The D-curve means it holds through the 10–20× In surge typical of motor starting, so it pairs with contactors or soft starters in a motor control center without nuisance tripping on the inrush.