Above that, the rating derates linearly: 477 A at 55 °C, 455 A at 60 °C, 432 A at 65 °C, and 410 A at 70 °C — so on a warm panel floor you lose nearly 20 % of the headline capacity. The interrupting rating is the other headline figure: 187 kA at 240 V AC, 121 kA at 415/440 V, 75.6 kA at 500 V, and 9 kA at 690 V. The 3-pole design is built for three-phase motor circuits.
Sizing and Coordination
The short-time withstand is rated at 6 kA limited to 1 second, with an initial value of 100 A. That short-time rating governs selectivity with downstream breakers: if you need full discrimination up to 6 kA, the 3VA2450 holds in for that duration before tripping, letting a downstream device clear the fault first. The trip times are adjustable between 3 s and 13 s — set them to coordinate with motor starting curves (avoid nuisance trips on inrush) while still clearing a locked-rotor condition.
Maximum power loss is 99 W — account for that heat in the enclosure thermal calculation, especially when multiple breakers are ganged.