Rated insulation voltage is 800 V, and the interrupting ratings climb to 242 kA at 240 V and 187 kA at 415 V — numbers that tell you this breaker is built for high-fault panels, not light distribution. Three poles, line-protection version, no undervoltage release, no ground-fault module, no communication stack — it's a straight feeder or main breaker, not a multifunction device.
Thermal derating and real-world loading
At 40 °C the breaker holds the full 250 A without derating; at 55 °C it's 241 A, at 70 °C it's 213 A. That means in a warm panel — say 50 °C — you still get the full 250 A, but if the enclosure runs hot from adjacent drives or transformers, you lose about 15 % by 70 °C. Plan your ambient accordingly. Maximum power loss is 48 W at rated current — not trivial in a sealed enclosure.