Its interrupting capacity varies with system voltage: 121 kA at 240 V, 76 kA at 415 V, 53 kA at 440 V, and 11.9 kA at both 500 V and 690 V. For a site electrical engineer planning coordination, the 121 kA at 240 V gives substantial headroom for high-fault panels, but the drop to 11.9 kA at 500 V means the available fault current at that voltage must be verified against the breaker's rating before committing the BOM line.
Thermal derating and continuous current
At 60 °C and 65 °C it derates to 19 A, and at 70 °C it stays at 19 A.
The 4-pole width (101.6 mm) is standard for a 4-pole MCCB in this frame size; it occupies four 25 mm module positions on a DIN rail. The N-conductor protection is rated at 100 %, meaning the neutral pole is fully rated and switches with the phase poles.