Rated 320 A at 40 °C ambient, it carries a 75.6 kA breaking capacity at 415 VAC — enough to handle high-fault utility feeds or transformer secondaries without cascading upstream.
Breaking capacity across voltages — where it fits
Breaking capacity drops from 121 kA at 240 VAC to 75.6 kA at 415 V and 440 V, then to 52.5 kA at 500 V, and 11.9 kA at 690 V. That 11.9 kA figure at 690 V still covers most motor branch circuits; the 75.6 kA at 415 V handles high-capacity transformer feeds. The 320 A continuous rating holds steady from 40 °C up to 50 °C, then derates linearly to 292 A at 70 °C — panel builders should check the thermal curve if the breaker sits near other heat sources in a sealed enclosure.
Integrated accessories and release options
The supplied basic switch is order code 3VA13324EF320AA0.
Dimensions: 248 mm height, 138 mm width, 110 mm depth. Verify gland-plate clearance for the 110 mm depth, especially in shallow enclosures with door-mounted operators.