What this MCCB is and what it does
The Siemens SENTRON 3VA1132-6EE32-0AA0 is a 3-pole molded case circuit breaker (MCCB) with a TM220 thermal-magnetic trip unit, rated 32 A at 40 °C. It's built for line protection in distribution panels and motor control centers — the kind of work where you need a solid, non-communicating breaker that clears faults fast and keeps the rest of the bus alive. The breaking capacity hits 220 kA at 240 V, 154 kA at 415 V, and still holds 17 kA at 690 V, so it handles high-fault utility feeds without cascading upstream. The TM220 trip gives you thermal protection for overloads and magnetic for short-circuits — no electronics to fail, no auxiliary power needed. Rated insulation voltage is 800 V, and the front face carries IP40 protection, meaning it keeps out tools and fingers in a closed panel but isn't sealed against moisture.
Sizing and derating for real panel conditions
The 32 A rating holds flat from 40 °C up to 50 °C, then starts a gentle slope: 31 A at 55 °C, 30 A at 65 °C, still 30 A at 70 °C. If your panel runs hot — say, near a drive cabinet or a transformer bay — you don't lose much headroom. That's a practical advantage over breakers that derate harder above 40 °C. Power loss is 10.6 W maximum, which is modest for a 32 A MCCB. In a dense DIN-rail layout, that keeps the internal temperature rise manageable and reduces the derating you'd otherwise need on adjacent devices.
Panel fit and physical integration
The 3VA1132-6EE32-0AA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 70 mm depth is worth noting if you're fitting it into a shallow enclosure or a gland-plate clearance issue — it's shallower than many MCCBs in this class, which helps with wiring space behind the panel door. Width of 76.2 mm is standard for a 3-pole frame; it occupies three 25 mm DIN positions if you're using a mounting plate. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. That covers most indoor industrial environments, including unheated warehouses and outdoor enclosures in moderate climates.