Breaking capacity is what you'd expect from a compact MCCB: 75.6 kA at 240 V, 52.5 kA at 415 V, and still 11.9 kA at 690 V, so it handles fault currents on most low-voltage distribution systems without a problem.
The 40 A rating holds from 40 °C up to 50 °C without derating — at 55 °C it's 39 A, at 70 °C it's 37 A.
Dimensions: 130 mm tall, 101.6 mm wide, 70 mm deep (-). Four poles in a single molded case; line and load lugs are standard. No undervoltage release or shunt trip built in, so if you need remote tripping you'll add an accessory.