Line protection MCCB with high interrupting capacity
The Siemens SENTRON 3VA1220-6EF42-0BC0 is a 4-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 200 A at 40 °C, with a derating curve that holds 200 A steady up to 50 °C, then drops to 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C — so in a warm enclosure you lose about 12% at the top end. The interrupting capacity is 220 kA at 240 V AC, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V; that 220 kA figure at 240 V tells you this breaker is sized for high-fault locations like a main service entrance or a transformer secondary where available fault current is well above typical panelboard levels. It ships with an undervoltage release (UVR) and two auxiliary switches HQ, so you get remote status indication and undervoltage protection built in without adding external modules. The insulation voltage is rated 800 V, and power loss at full load is 44.5 W — a number to factor into enclosure thermal calculations if you're packing several breakers in a small cabinet.
Panel fit and mounting
Dimensions are 70 mm deep, 140 mm wide, 158 mm high — a standard SENTRON 3VA footprint that mounts on a DIN rail or directly to a backplate via screw terminals. The 4-pole width (140 mm) matches the typical 4-module spacing in a distribution board; verify the gland plate clearance if you're retrofitting into an existing panel that was laid out for a narrower 3-pole breaker.