No undervoltage release is fitted, so the breaker stays latched on loss of control power unless the shunt trip is actively triggered.
This MCCB's short-circuit rating drops as line voltage rises: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. The steep drop above 440 V reflects the arc-energy physics in a compact frame — at 690 V the breaker still handles 11.9 kA, enough for most motor-control-center fault levels but not for high-capacity transformer secondaries at that voltage.
Rated current holds at 80 A from 40 °C through 50 °C ambient, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. In a sealed, uncooled enclosure near other heat sources, expect to knock off 5–8 % from the nameplate for reliable long-term operation. The 70 mm depth and 101.6 mm width fit standard Siemens 3VA panel cutouts; the supplied basic switch (3VA10804ED420AA0) is the replaceable switching mechanism inside the molded case.