SENTRON 3VA1220-5MH32-0AA0 — 200 A MCCB with TM120M Release
The Siemens 3VA1220-5MH32-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 200 A continuous current across all three poles, with a TM120M thermal-magnetic overcurrent release. The 200 A rating holds flat from 40 °C through 50 °C ambient, then derates 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 panel you lose about 12% of capacity at the top of the operating range. Interrupting capacity is the headline here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 4.5 kA at 690 V. That 187 kA at 240 V tells you this breaker is built for high-fault industrial panels — transformer secondaries or large motor control centers where available fault current is substantial. The 690 V figure of 4.5 kA is more modest, so if your application is a 690 V distribution board, verify the SCCR coordinates with your upstream transformer.
Panel Fit and Integration
Dimensions are 105 mm wide, 158 mm high, 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures. The front face carries IP40 protection, meaning it's protected against tools and small wires but not sealed against water; keep it inside a rated enclosure for washdown areas. Rated insulation voltage is 800 V, so it's suitable for 480 V and 600 V class systems with adequate margin. Maximum power loss at rated current is 42 W — plan for that heat in a sealed enclosure; it's not negligible in a dense panel.