What this MCCB carries — and what it doesn't
The Siemens SENTRON 3VA1220-6EF42-0DA0 is a 4-pole molded case circuit breaker (MCCB) with a TM240 thermal-magnetic release, designed for line protection. It's rated 200 A continuously at 40 °C, and holds that rating flat through 50 °C — at 55 °C it derates to 194 A, and at 70 °C it's still good for 176 A. That's a solid thermal curve for a panel that runs warm. The breaking capacity is the headline: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. That's a high-interrupting rating — it'll clear a fault upstream of a big transformer or a bus tie without the arc flash energy getting away from you. The 4-pole construction means it switches the neutral as well as the three phases, which is standard for TN-S or IT systems where you need full isolation. It includes an undervoltage release (UVR) as the auxiliary release type — so if your control voltage drops, the breaker trips. That's a common spec for emergency-stop chains or undervoltage protection on motor feeders. No ground-fault monitoring, no communication module, no voltage-trigger accessory built in. The basic switch assembly is order code 3VA12206EF420AA0.
Panel fit and thermal budget
Footprint is 140 mm wide by 158 mm tall by 70 mm deep — that's a 4-pole frame in a standard SENTRON 3VA form factor. It mounts on a DIN rail or directly to a backplate via the screw terminals. The 70 mm depth means it fits inside a 200 mm deep enclosure with room for wiring gutters. At full load it dissipates 44.5 W max — factor that into your enclosure cooling calculation if you're packing multiple breakers in a row. Rated insulation voltage is 800 V, so it's comfortable on 690 V systems with margin. Operating range is -25 °C to 70 °C ambient; storage from -40 °C to 80 °C. The TM240 release is fixed thermal-magnetic — no interchangeable trip units on this variant, so the trip curve is set at the factory.