What this MCCB is and where it fits
The Siemens SENTRON 3VA1220-6EF42-0DH0 is a 4-pole molded case circuit breaker (MCCB) rated 200 A continuous current, built around the TM240 thermal-magnetic trip unit. It's a line-protection breaker — no voltage trip, no ground-fault monitoring, no communication module — so it's a straightforward overcurrent and short-circuit protector for distribution panels, motor control centers, and feeder circuits. Rated insulation voltage is 800 V, and the interrupting ratings climb to 220 kA at 240 V, 154 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V. That kind of SCCR headroom means this breaker handles high-fault-capacity distribution — think large transformer secondaries or industrial mains where upstream coordination demands a stiff interrupting rating.
Thermal derating and real-world current
The 200 A rating holds from 40 °C through 50 °C ambient. Above that, it derates linearly: 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, 176 A at 70 °C. If the panel runs hot — say next to a drive bank or in a non-conditioned enclosure — you need to size upstream for the derated number, not the nameplate 200 A. Operating range spans -25 °C to 70 °C, storage from -40 °C to 80 °C.
Integration notes
Dimensions: 140 mm wide, 158 mm tall, 70 mm deep. Front protection is IP40 — fine for a dry enclosure, but not for washdown or outdoor exposure. Mechanical endurance is rated at 15,000 operations. The TM240 trip unit is thermal-magnetic; no phase-failure detection, no ground-fault monitoring, no communication function. If your panel needs those, you'd step up to the electronic-trip variants in the same 3VA family.