Siemens SENTRON 3VA1020-2ED32-0HC0 — 20 A MCCB for Line Protection
It carries a breaking capacity of 52.5 kA at 240 V AC, dropping to 32 kA at 415 V and 7.5 kA at 690 V — so it handles high-fault utility feeds downstream of a transformer.
Rated current holds at 20 A from 40 °C up to 55 °C, then derates to 19 A at 60–70 °C — useful if the breaker sits near transformers or other heat sources inside the enclosure. Maximum power loss of 12 W means ventilation planning matters in a sealed cabinet. This breaker ships with a built-in shunt trip release (STL) and two auxiliary switches (HQ), so you can remote-trip and monitor status without adding external accessories.