Breaking capacity is 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — enough to clear a bolted fault on most industrial secondary distribution without upstream coordination headaches.
Above that it starts to taper: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. Power loss at full rated current is 28.1 W maximum. That's the heat the breaker dumps into the enclosure; factor it into the panel's thermal budget, especially in a sealed box.
Auxiliary release and integration
That means you can trip the breaker remotely by applying a control voltage — useful for emergency-stop circuits or supervisory shutdowns. No undervoltage release on this order code, so if you need UVR for a safety circuit, this isn't the one. It's a straight line-protection MCCB with remote trip capability. The basic switch assembly is order code 3VA11124EF320AA0.
Dimensions: 130 mm high, 76.2 mm wide (3 inches), 70 mm deep. That covers unheated warehouses and outdoor cabinets in most climates.