The 3-pole unit breaks up to 75.6 kA at 240 V and 52.5 kA at 415 V, which covers most commercial and light industrial fault levels without cascading upstream.
The interrupting ratings step down with voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. At 415 V the 52.5 kA figure gives selectivity headroom against a 50 kA prospective fault — useful when coordinating downstream MCBs in a multi-level panel.
Thermal derating and ambient limits
Full 20 A rating holds through 50 °C ambient. In a sealed panel with multiple breakers ganged, factor the 55 °C+ derating into the load schedule.
Auxiliaries and trip options
The 3VA platform is Siemens' active MCCB family, so factory support and replacement auxiliaries are standard.