The ETU320 gives you adjustable thermal and magnetic trip settings, so you can dial it in for the load without swapping the breaker. This is a current-production part (lifecycle stage is active), so it's still the standard build for new panels, not a legacy item you're hunting down on surplus shelves.
At 240 V it interrupts up to 440 kA; at 415 V that drops to 330 kA, and at 690 V it still handles 52.5 kA. That matters when you're packing breakers into a tight panel next to transformers or drives that throw heat.