What this MCCB is and what the ratings mean for your panel
The Siemens 3VA1132-4EF36-0HC0 is a SENTRON 3-pole molded case circuit breaker (MCCB) designed for line protection — the primary overcurrent device between a transformer or feeder and a distribution bus. It carries a continuous current rating of 32 A at 40 °C, and that rating holds flat to 50 °C before it starts to derate: 31 A at 55 °C, 30 A at 70 °C. That means in a warm enclosure you lose only 2 A off the nameplate, which is better than many MCCBs that start rolling off at 40 °C. The breaking capacity is the headline number here — 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500 V and 690 V. That 121 kA figure at 240 V is what you need for high-fault service-entrance or transformer-secondary applications where the available fault current is in the 100 kA range. The 75.6 kA at 415 V covers most European industrial distribution panels. The drop to 11.9 kA at 500/690 V means this breaker is not the right choice for a 690 V motor control center with high fault current — you would need a higher-rated frame for that. Rated insulation voltage is 800 V, so the internal clearances and creepage are designed for 690 V systems with margin. The breaker ships with a shunt trip (STL) auxiliary release and two HQ auxiliary switches built in — that means it can be remotely tripped and its status reported back to a PLC or annunciator without adding external relays. Power loss at full load is 10.6 W, which is modest for a 32 A MCCB and helps keep enclosure internal temperature rise manageable.
Panel fit and integration
The 3VA1132-4EF36-0HC0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 76.2 mm width is a standard 3-inch footprint for a 3-pole MCCB.