What this 200A 4-pole MCCB carries
The Siemens 3VA1220-4EF42-0DH0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection — 200 A continuous at 40 °C, 4-pole, with a 121 kA interrupting capacity at 240 V AC. That 121 kA at 240 V means it can safely clear a fault current up to that level without welding contacts or cascading failure upstream; at 415 V the rating drops to 75.6 kA, and at 690 V to 11.9 kA, which is typical for this class of breaker. It ships with an undervoltage release (UVR) fitted — the coil drops the breaker if control voltage falls below the dropout threshold, which is standard for emergency-stop circuits or mains-loss protection schemes. The auxiliary switch block carries 2 auxiliary switches plus 1 trip alarm switch (HQ type), so you get both status feedback and a separate fault-indication contact without adding a module.
Thermal derating and panel fit
The breaker holds 200 A flat from 40 °C through 50 °C — no derating needed in a warm enclosure. At 55 °C it steps to 194 A, at 60 °C to 188 A, and at 70 °C to 176 A. That 176 A at the top of the operating range (-25 to 70 °C ambient) is still enough for most 160 A feeder circuits, but if your panel runs hot, check the 70 °C column before sizing. Footprint is 140 mm wide × 158 mm high × 70 mm deep — a standard 4-pole MCCB envelope for DIN-rail or panel-mount. The 44.5 W maximum power loss at full load means ventilation is advisable in a sealed enclosure, but it won't cook adjacent devices in a ventilated cabinet.