The Siemens SENTRON 3VA1020-3ED32-0DC0 is a 3-pole molded case circuit breaker rated for 20 A continuous current (Iu) at 40 °C, with a TM210 thermal-magnetic release — that means the thermal element handles overloads and the magnetic element handles short-circuits, no separate trip unit to order. Breaking capacity runs 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V — so on a 480 V panel it clears faults well above typical available fault current, and the 690 V rating covers 600 V class gear without derating. Front protection is IP40, so it's fine for a dry indoor panel; the 70 mm depth, 76.2 mm width, and 130 mm height match the standard SENTRON 3VA footprint for retrofit into existing Siemens MCCB panels.
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. That's a linear derating curve, easy to apply if your enclosure runs hot.
What's on the nameplate vs what's inside
The overcurrent release is a TM210 — thermal-magnetic, fixed, non-interchangeable. No ground-fault monitoring module, no phase-failure detection, no communication function, and no voltage trigger. It's a straight line-protection breaker for standard distribution. The integrated auxiliary trip accessory is order code 3VA9608-0BB25 — if you need a replacement shunt or UVR coil, that's the separate part number.