The ABB S201-B63 is a 1-pole miniature circuit breaker (MCB) rated 63 A with a Trip Curve B characteristic, interrupting 6 kA at 277 VAC.
63 A is the continuous current rating — the breaker carries that load indefinitely at 30 °C ambient without tripping. A Curve C or D breaker would be needed for motor or transformer loads with higher inrush.
Integration note
Single-pole format takes one 18 mm DIN module width. The busbar comb system (ABB PS series) bridges multiple S200-series breakers without extra wiring — match the comb pitch to the number of poles. Terminal capacity accepts up to 25 mm² conductor; torque to the value on the nameplate.