63 A SENTRON MCCB with shunt trip — line protection variant
The shunt trip (order code 3VA9688-0BL32 for the integrated auxiliary trip) allows remote tripping via a control voltage, which is the main reason a buyer lands on this variant over a plain thermal-magnetic MCCB. Rated insulation voltage Ui is 800 V, and the interrupting capacity varies sharply with system voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4 kA at 690 V. At 690 V the capacity drops to 4 kA, so confirm the available fault current if deploying on a 690 V line.
Above that it derates linearly: 60.6375 A at 55 °C, 58.275 A at 60 °C, 55.9125 A at 65 °C, and 53.55 A at 70 °C.
What the ETU320 release means for coordination
It provides a fixed time-current curve; there is no LSI adjustment, no ground-fault element, and no communication. For selective coordination studies, the ETU320's fixed curve is simpler to model than an adjustable ETU600, but it also means you cannot fine-tune the long-time pickup or short-time delay. If the application requires adjustable trip settings or zone-selective interlocking, the 3VA2 frame supports ETU330/ETU600 releases on other order codes — but this specific variant is fixed.