Siemens 3VA1120-6GD42-0AA0 — 20 A SENTRON MCCB, 4-Pole, TM210 Release
Interrupting capacity is the headline here: 220 kA at 240 V AC, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA at 500 V and 690 V. That's a high-fault rated MCCB — it can sit upstream of a transformer or feed a bus where the available fault current is significant, without needing a current-limiting fuse ahead of it. Rated insulation voltage is 800 V, and the breaker carries a 12 W maximum power loss at full load — factor that into enclosure thermal rise calculations if you're packing multiple units in a small panel.
Footprint & Panel Fit
Dimensions: 130 mm high, 101.6 mm wide, 70 mm deep. That's a 4-pole frame in a standard SENTRON 3VA1 footprint — the same width as the 3-pole sibling, just deeper to accommodate the fourth pole. It mounts on a DIN rail or can be screw-fixed to a backplate; the IP40 front face is fine for enclosed panels but not for washdown environments. The TM210 release is fixed-thermal and fixed-magnetic — no interchangeable rating plugs, so what you order is what you get. If your load calculation is tight at 20 A, confirm the ambient temperature derating: the breaker holds 20 A from 40 °C up to 55 °C, then derates to 19 A at 60–70 °C.