Interrupting capacity — what those numbers mean for your panel
This breaker carries a 330 kA interrupting rating at 240 V AC and 242 kA at 415/440 V. At 500 V it still holds 187 kA, dropping to 3 kA at 690 V. That kind of headroom means it can sit upstream of smaller branch breakers and still clear a bolted fault without welding its contacts shut — critical for selective coordination in a distribution panel.
The front face carries an IP40 protection rating — fine for a dry indoor panel, but keep it behind a gland plate if the enclosure sees washdown.