SENTRON 3VA2 MCCB — 63 A line protection with ETU320
Three poles, rated continuous current Iu of 63 A. The ETU320 release is an electronic, non-communicating trip unit — no phase-failure detection, no voltage trigger, no auxiliary release fitted. Two auxiliary switches (HQ type) are built in. Thermal derating is minimal up to 50 °C (still 63 A), then drops to 60.6 A at 55 °C, 58.3 A at 60 °C, 55.9 A at 65 °C, and 53.6 A at 70 °C.
No rewiring needed if replacing a 3VA2 with identical auxiliary contact configuration; the HQ auxiliary switches occupy the same slot positions.