It carries an electronic ETU550 overcurrent release, which means you get adjustable trip curves rather than fixed thermal-magnetic action — useful when coordinating with downstream breakers or managing inrush on motor circuits.
Breaking capacity and what it means on site
This breaker is rated 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. The 690 V rating drops to 7.5 kA, so confirm your high-voltage system's short-circuit capacity if running above 600 V.
Thermal derating curve — real-world current
At 55 °C it derates to 375 A, at 60 °C to 350 A, at 65 °C to 325 A, and at 70 °C to 300 A.
The case measures 248 mm tall, 138 mm wide, and 110 mm deep. That 110 mm depth is the dimension to watch when fitting into a shallow enclosure or against a backplate with bus bars running behind it.
The ETU550 electronic trip unit includes communication capability (PROFIBUS or similar via a communication module), so it fits into a monitored distribution scheme. Insulation voltage rated 800 V, power loss 96 W at full load — factor that into your enclosure ventilation.