At 415 VAC the interrupting rating is 75.6 kA, and at 690 VAC it still holds 11.9 kA, so it handles high-fault commercial and industrial service entrances where the available short-circuit current is substantial.
Ratings that drive the panel design
The breaker is rated 20 A continuously at ambient temperatures up to 55 °C; at 60 °C it derates to 19 A, and holds 19 A through 70 °C. That thermal curve matters when the MCCB is packed into a crowded enclosure — you can load it to 20 A in a 55 °C panel, but above that you lose 1 A.
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a 3-pole MCCB that fits standard 3-inch-wide panel mounting. The depth of 70 mm (2.76 in) leaves clearance for rear-mounted bus bars or cable ducts. Maximum power loss is 12 W, so ventilation in a sealed enclosure is advisable if multiple breakers are ganged.