Its 63 A continuous current at 40 °C holds steady through 50 °C before derating begins — at 55 °C it's 60.6 A, at 70 °C it's 53.6 A. That means the breaker carries its full rating across typical panel ambient temperatures without forced derating, which matters when you're stacking multiple breakers in a closed enclosure. The breaking capacity is the headline number here: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V. For a 63 A frame, 187 kA is high — this breaker is designed for installations with high available fault current, typically close to the transformer secondary or on a large industrial service entrance. The undervoltage release is built in — when control voltage drops, the breaker trips automatically, which is standard for safety circuits and emergency-stop chains.
The 105 mm width is standard for a 3-pole MCCB in this class — it occupies three 35 mm DIN spaces (3 x 35 mm = 105 mm). Maximum power loss is 6.5 W — negligible for enclosure heat budgeting but worth noting if you're packing a high-density panel.