What this MCCB is and what it carries
The 3VA1220-4EF42-0AD0: Rated uninterrupted current holds at 200 A from 40 °C through 50 °C ambient, then derates linearly to 176 A at 70 °C — the full thermal curve is on record for panel builders sizing for elevated enclosure temperatures. Interrupting capacity is voltage-dependent: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V. These are the values that govern SCCR coordination downstream — the 415 V figure is the one most often checked for European 400 V distribution panels.
Sizing and selectivity notes
Rated insulation voltage is 800 V, giving headroom above the 690 V interrupting rating for systems where the nominal voltage sits well below the insulation withstand. Maximum power loss is 42 W — a figure to include in enclosure thermal calculations if the breaker is enclosed with other heat sources. The breaker ships with three auxiliary switches (HQ design) integrated, and the supplied basic switch is order code 3VA12204EF420AA0. No undervoltage release, ground-fault monitoring, or communication function is fitted on this variant — those are separate accessory additions if the application requires them.
Physical fit and panel integration
Dimensions are 158 mm high, 140 mm wide, 70 mm deep. The 4-pole width (140 mm) is the critical dimension for DIN-rail or mounting-plate layout — verify the back-panel footprint matches the existing cutout or drill pattern before committing the BOM line. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage low-end matters for unheated warehouses in cold climates — the breaker can sit at -40 °C without damage as long as it is not energized until warmed within the operating band.