The 121 kA breaking capacity at 240 V AC is the headline number for fault clearing; at 415 V it still holds 75.6 kA, and at 690 V it drops to 11.9 kA — the voltage-dependent SCCR matters for the point of common coupling in your system.
Current derating and thermal reality
At 55 °C it carries 48 A, at 60 °C it's 47 A, at 65 °C it's 46 A, and at 70 °C it's 45 A. If your panel internal ambient runs hot (enclosed, sun-loaded, next to drives), size the load side for the derated figure, not the nameplate 50 A.
Integrated auxiliary and shunt trip
The shunt trip is the integrated auxiliary release design; its order code is 3VA9688-0BL33. If you need remote undervoltage protection or Modbus communication, this is not the variant — look at the 3VA1 family with electronic releases.
Front IP40 protection class — suitable for enclosure mounting behind a door or cover, not for washdown. Dimensions: 130 mm height, 76.2 mm width (3-pole standard), 70 mm depth. Latching endurance is 15,000 operations — not a high-cycle switching device, but fine for infrequent disconnect duty.