Siemens SENTRON 3VM1220-4EE32-0AA0 — 200 A MCCB, Line Protection, Active Production
Breaking capacity is the headline here: 121 kA at 240 V AC, 76 kA at 415 V, 53 kA at 440 V, and 17 kA at 500 V. That 121 kA at 240 V is high for a 200 A frame — it clears heavy fault current without cascading upstream, which matters when you're coordinating downstream feeders in a distribution panel. Insulation voltage is rated 800 V, operating voltage 690 V AC, so it's fit for 480 V and 600 V class systems with headroom. The TM220 release is a thermal-magnetic design — thermal element for overload, magnetic for short-circuit. No electronic trip unit, no communication function, no ground-fault monitoring. That keeps it simple and reliable for basic line protection where you don't need adjustable curves or remote monitoring. Power loss is 42 W maximum at rated current, so factor that into enclosure thermal calculations.
Mounting and Environment
Dimensions: 158 mm high, 105 mm wide, 70 mm deep. That 105 mm width is a standard 3-pole MCCB footprint — it fits existing DIN-rail or panel-mount layouts without surprises. IP40 on the front means it's protected against tools and wires over 1 mm, but not sealed against dust ingress; install in a clean enclosure or add a cover for dirty environments. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. The current derating curve above 55 °C is published: 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, 176 A at 70 °C. If your panel ambient runs hot, size the breaker for the actual temperature, not the 40 °C nameplate.