What this 200 A MCCB is and where it fits
The Siemens SENTRON 3VA1220-4GF42-0AF0 is a 4-pole molded case circuit breaker rated at a full 200 A continuous, with a TM240 thermal-magnetic trip unit onboard. It's built for line protection — think main feeder or large subfeed in a distribution panel where you need a single breaker to handle the whole branch. Interrupting capacity is the headline here: 121 kA at 240 V, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V. That 121 kA number at 240 V means it'll clear a dead short on a big 240 V feeder without the arc flash getting out of hand — important for panel safety and selectivity coordination. Insulation voltage is rated at 800 V, so the breaker's insulation system is designed for 690 V systems with margin. The 200 A rating holds steady from 40 °C up through 50 °C, then derates gradually to 176 A at 70 °C — meaning in a warm panel you still get the full 200 A unless ambient climbs above 50 °C.
Physical fit and panel integration
This 4-pole breaker measures 70 mm deep, 140 mm wide, and 158 mm tall. The 140 mm width is standard for a 4-pole frame in this class — it'll drop into a SENTRON panelboard or a DIN-rail adapter without surprises. Depth at 70 mm leaves room for wiring gutters and bus bar connections behind the breaker. The design includes a trip indicator and comes with one auxiliary switch plus one trip alarm switch (HQ type) factory-installed. That gives you remote status — handy for a PLC input or a panel light showing the breaker tripped. No undervoltage release, no ground-fault monitoring, no communication module on this variant; it's a straightforward thermal-magnetic line protection breaker.
Sourcing and lifecycle status
Power loss is rated at 42 W maximum at full load. That's the heat you need to vent in the enclosure — not huge for a 200 A breaker, but worth checking if you're packing several in a sealed box. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.