The IP40 front protection keeps dust and tools out of the breaker face in a standard panel enclosure.
The interrupting rating drops as voltage climbs: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. At 690 V the breaker is still usable but the fault-current ceiling is low — plan your arc-flash study accordingly.
Thermal performance and derating
That's unusual for a compact MCCB and simplifies the panel schedule. Max power loss is 25.5 W, so ventilation requirements are modest.
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep — roughly 4.1 by 7.1 by 3.4 inches. Three-pole footprint matches standard SENTRON 3VA panel cutouts. The ETU320 is electronic, so coordination studies are easier than with thermal-magnetic units.
