The Siemens 3VA1220-4EF32-0AF0 is a SENTRON molded case circuit breaker (MCCB) in the 3VA platform, sized for 200 A continuous duty and configured as a 3-pole line-protection device with a TM240 thermal-magnetic trip unit. Breaking capacity is the headline selector here: 121 kA at 240 V, 75.6 kA at 415 V, 25 kA at 440 V, and 11.9 kA at 690 V — so the same breaker covers high-fault 240 V service entrances and 400 V distribution boards without stepping up to a larger frame. The thermal derating curve is published across the full ambient range: 200 A flat from 40 °C to 50 °C, then 194 A at 55 °C, 188 A at 60 °C, 182 A at 65 °C, and 176 A at 70 °C. The auxiliary contact block is a 1 NO + 1 NC auxiliary switch paired with a separate trip-alarm switch (HQ configuration), giving you both position indication and fault annunciation on a single breaker.
Dimensions: 105 mm wide, 158 mm high, 70 mm deep. The -25 °C floor matters for unheated outdoor cabinets in temperate climates — the breaker is rated to close and carry load at that low end.