The ABB 1SDA051246R1 is a T3N-frame molded case circuit breaker rated 200 A, three-pole, with thermal-magnetic trip and IEC classification — the standard choice for protecting distribution feeders and motor branch circuits in a panel.
The 200 A continuous rating on a T3N frame means it handles the full load current of a moderate-sized submain or a large motor starter without nuisance tripping, while the thermal-magnetic trip provides both overload (thermal) and short-circuit (magnetic) protection in one device — no separate relay needed.