What this 160 A MCCB carries
The Siemens 3VA1216-5MH32-0AF0 is a 3-pole molded case circuit breaker from the SENTRON 3VA1 series, rated 160 A at 40 °C and designed for starter protection — meaning it's built to sit ahead of a motor starter and handle the high inrush without nuisance tripping, while still clearing a bolted fault. Breaking capacity is 187 kA at 240 V AC, 121 kA at 415 V, and 75.6 kA at 440 V — numbers that put it in the high-interrupting class for industrial panels where the available fault current is serious. The TM120M thermal-magnetic release gives it a fixed time-current curve suited for motor branch circuits; the integrated auxiliary switch (1 NO/NC) plus a separate trip-alarm switch means you get both position feedback and a fault signal without adding external relay logic.
Where it fits in the panel
Footprint is 105 mm wide × 158 mm tall × 70 mm deep — standard 3-pole MCCB envelope for a 160 A frame. Mounts on a DIN rail or direct panel via the screw terminals. The 70 mm depth leaves room for wiring gutters in a 200 mm deep enclosure. Rated insulation voltage is 800 V, so it's comfortable on 480 V and 600 V class systems with solid margin. Operating range is -25 °C to 70 °C ambient; storage from -40 °C to 80 °C. Power loss at full load is 33 W maximum — factor that into the panel thermal budget if you're stacking several breakers in a sealed enclosure.
Thermal derating and real-world current
Rated current holds flat at 160 A from 40 °C through 50 °C. At 55 °C it's 156 A, at 60 °C it's 151 A, at 65 °C it's 147 A, and at 70 °C it's 142 A. That's a gentle derating curve — you lose only about 1 A per °C above 50 °C, which is better than many MCCBs that drop 2–3 A/°C. If your panel ambient runs 55 °C, you still get 156 A continuous — enough for a 150 A motor feeder without upsizing the frame.