What this 3VA1020-4ED32-0DA0 brings to a panel
It is the line protection variant, meaning it protects downstream cables and equipment against overload and short-circuit without integrated ground-fault or phase-failure detection. The TM210 release gives a fixed thermal pickup and magnetic trip that is non-interchangeable in the field — what you see is what you get for the 20 A frame. At 240 V it interrupts faults up to 121 kA, at 415 V up to 75.6 kA, and at 690 V still holds 11.9 kA, so it handles high available fault current in distribution panels without requiring a current-limiting upstream device in most installations.
Above that it begins to taper: 19.2 A at 55 °C, 18.8 A at 60 °C, 18.4 A at 65 °C, and 18 A at 70 °C.
That 76.2 mm width is a standard 3-pole MCCB footprint — three 25.4 mm pole pitches — so it drops into existing DIN-rail or screw-mounted panel layouts without re-drilling.
Integrated undervoltage release
The UVR is designed in, not added as a field-installed accessory, so the wiring plan should account for it from the start.