The ETU320 electronic overcurrent release provides adjustable protection curves — a solid choice for feeding a main distribution board or a large motor control center, where you need to coordinate selectivity downstream.
Breaking capacity is what decides whether this breaker survives a fault without welding its contacts. At 240 V it clears 187 kA (cites:); at 415 V and 440 V it holds 121 kA (cites:,); at 500 V it drops to 75.6 kA (cites:); at 690 V it still manages 17 kA (cites:). Thermal derating matters when the panel runs hot. The 3VA2340-5HL32-0AE0 holds its full 400 A up to 50 °C (cites:,). At 55 °C it derates to 385 A (cites:); at 60 °C to 370 A (cites:); at 65 °C to 355 A (cites:); at 70 °C to 340 A (cites:). In a sealed enclosure with poor airflow, plan for the 50 °C threshold — above that, you lose headroom.
Four auxiliary switches (HQ type) are integrated (cites:), which saves an external interposing relay for status feedback to the PLC.