The Siemens SENTRON 3VA1020-3ED36-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 20 A continuously at 40 °C ambient and derating to 19 A at 60 °C. Its interrupting capacity hits 75.6 kA at 240 V AC, dropping to 52.5 kA at 415 V and 7.5 kA at 690 V — so it handles high-fault utility feeds downstream of a transformer but needs a check at higher line voltages. Two auxiliary switches plus a separate trip-alarm switch (HQ) are built in, so you get status feedback without adding external blocks.
Footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB width that fits most DIN-rail or screw-mount panel layouts.