Siemens 3VA1020-3ED36-0JA0 — 20 A MCCB with TM210 Release
It's built for line protection — the core job of clearing overloads and short circuits in a distribution panel without taking out upstream gear. The interrupting ratings climb with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and still 7.5 kA at 690 V. That's enough SCCR headroom for most industrial secondary distribution — a 240 V panel with a 65 kA available fault current is comfortably covered, and the 415 V figure handles heavy European-style networks. Thermal derating is minimal up to 50 °C — the breaker holds its full 20 A rating. Past that it drops gradually to 18 A at 70 °C, which is the maximum operating ambient. If the panel runs hot near a furnace or in a sealed enclosure, that derating curve matters for the BOM line.
Footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB slice that fits most DIN-rail or backplate layouts without surprises. If the panel spec calls for those, you'd step to a different suffix.