The ABB S201-D13 is a 1-pole miniature circuit breaker rated 13 A with a Trip Curve D characteristic, designed as a supplementary protector per UL 1077 and CSA 22.2 No. 235. The 13 A rating and D-curve (10–20× In magnetic trip) make it a fit for motor-starting and transformer-inrush applications where a standard C-curve would nuisance-trip on the magnetizing inrush. Single-pole format on a DIN-rail footprint keeps panel integration straightforward — one module width on the rail, finger-safe terminals standard.
UL 1077 listing means it's a supplementary protector, not a branch-circuit rated MCB per UL 489; that distinction matters for code compliance in the US — it protects downstream loads but isn't a service-entrance or feeder breaker.