The interrupting ratings tell you where this breaker can safely clear a fault: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 4.5 kA at 690 V. That 187 kA figure at 240 V is high enough for most industrial distribution panels with large transformer feeds; the drop to 4.5 kA at 690 V means you need to verify the available fault current at that voltage level before committing the BOM line.
The 160 A rating holds flat from 40 °C through 50 °C, then derates to 156 A at 55 °C, 151 A at 60 °C, 147 A at 65 °C, and 142 A at 70 °C. Maximum power loss is 35.5 W — that heat has to be vented in a sealed enclosure.
Built-in auxiliary and undervoltage release
The basic switch assembly is order code 3VA12165MH320AA0.