It's a 4-pole unit rated 80 A at 40 °C, with an interrupting capacity of 121 kA at 240 V and 75.6 kA at 415 V — high enough for most main or feeder applications behind a transformer.
The 80 A continuous rating holds across 40 °C to 50 °C, then derates to 74 A at 70 °C — useful if the breaker sits in a warm enclosure or near other heat sources. The 121 kA interrupting rating at 240 V means it can clear a bolted fault at that level without rupturing; at 415 V the rating drops to 75.6 kA, and at 690 V to 11.9 kA.