The Siemens 3VA1220-4GF42-0DA0 is a SENTRON molded case circuit breaker (MCCB) rated for 200 A continuous, 4-pole construction, designed for line protection. It carries a TM240 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR) — that's the '4GF42' in the code: the UVR drops the breaker if control voltage is lost, which matters for safety circuits or remote emergency-stop chains.
Breaking capacity and selectivity headroom
Breaking capacity climbs with system voltage: 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. At 415 V that's well above typical utility fault levels in most industrial panels — you get selectivity headroom without cascading upstream breakers. The 800 V rated insulation voltage means the internal clearances are built for 690 V systems, not just 480 V.
Thermal derating — what the 200 A rating actually delivers
The 200 A rating holds from 40 °C up to 50 °C ambient. At 55 °C it derates to 194 A, at 60 °C to 188 A, at 65 °C to 182 A, and at 70 °C to 176 A. If your panel internal ambient runs hot — say a packed enclosure near a furnace line — the 176 A floor at 70 °C still covers a 175 A feeder. The operating range spans -25 °C to 70 °C, storage from -40 °C to 80 °C. Power loss at full load is 44.5 W; factor that into your enclosure thermal budget.
Physical fit and panel integration
Dimensions are 158 mm high, 140 mm wide, 70 mm deep. That 70 mm depth is shallow enough for most 200 mm deep enclosures — you're not fighting the door clearance. Four-pole width at 140 mm is standard for a 200 A frame; it occupies the same footprint as other SENTRON 3VA1 breakers, so a panel laid out for a 3VA1 4-pole accepts this without re-drilling the mounting plate.