What this MCCB carries — and what it doesn't
The Siemens 3VA1020-3ED32-0HA0 is a SENTRON 3-pole molded case circuit breaker (MCCB) sized for line protection — not motor protection, not feeder protection with ground-fault. Rated continuous current Iu is 20 A, and the interrupting capacity hits 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. That 75.6 kA figure at 240 V tells you this breaker can sit upstream of a high-fault panelboard without cascading; the 7.5 kA at 690 V is the ceiling for a 690 V line-side application. The TM210 overcurrent release is a thermal-magnetic fixed-trip — no electronic adjustment, no communication, no phase-failure detection. It's a straightforward, mechanically latched MCCB with a shunt trip (STL) for remote opening.
Derating and panel fit
The 20 A rating holds flat from 40 °C through 50 °C; at 55 °C it drops to 19.2 A, at 60 °C to 18.8 A, at 65 °C to 18.4 A, and at 70 °C to 18 A. If the panel ambient inside the enclosure runs above 50 °C, that 2 A difference matters for a continuous load near the limit. Dimensions are 70 mm deep, 76.2 mm wide, 130 mm tall — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount SENTRON busbar systems. Front protection is IP40, so it's sealed against tools and fingers but not against washdown; keep it inside a rated enclosure.