Breaking capacity sits at 187 kA at 240 V, 121 kA at 415 V and 440 V, dropping to 79 kA at 500 V and 5.1 kA at 690 V — that 121 kA at 415 V is the figure most European 400 V panel builders will size against for high-fault utility feeds or transformer secondaries. Current rating holds flat at 250 A from 40 °C up through 50 °C ambient, then derates to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C — if your enclosure runs hot, that 200 A at 70 °C is the number to design to, not the nameplate 250 A.
Integration — footprint and auxiliaries
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — standard 3-pole frame for the SENTRON 3VA2 platform, so it fits existing 3VA2 panel cutouts and busbar kits without re-drilling. Comes with 2 auxiliary switches HQ (high-rupturing-capacity contacts) and an undervoltage release (UVR) pre-installed — the auxiliary trip is order code 3VA9608-0BB24, and the basic switch (the breaker without the UVR) is 3VA2225-5JP32-0AA0 if you need a spare mechanism. Communication function is built in on this variant — the ETU550 supports Modbus RTU via the SENTRON communication module, so you can pull trip events, load profiles, and status from the breaker into a PLC or SCADA without adding an external I/O block.
Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C — fine for unheated electrical rooms or outdoor enclosures in temperate climates, but watch the 70 °C derate curve above if ambient hits the upper end.