What this MCCB is and where it fits
The Siemens SENTRON 3VA1132-4EF36-0CH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries a continuous current of 32 A at 40 °C and delivers a breaking capacity of 121 kA at 240 V AC — enough to handle high-fault utility feeds or transformer secondaries without cascading upstream. The 70 mm depth and 76.2 mm width fit standard Siemens SENTRON mounting footprints, so it swaps into an existing panel layout without re-drilling the backplate.
Breaking capacity across voltages
The interrupting rating drops as system voltage rises: 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. For a 400 V class panel, the 75.6 kA figure is the one that governs fault-current coordination with the upstream transformer.
Thermal derating and ambient limits
Rated current holds at 32 A from 40 °C through 50 °C, then derates to 31 A at 55 °C and 60 °C, and 30 A at 65 °C and 70 °C. Operating ambient range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. The 13.1 W maximum power loss matters for enclosure heat rise calculations when multiple breakers are ganged.
Integrated accessories
Factory-fitted with an undervoltage release (UVR) and two auxiliary switches plus one trip alarm switch (HQ configuration). The UVR trips the breaker when control voltage drops below a threshold — standard for emergency-stop or undervoltage protection schemes. A mechanical trip indicator is present for visual status at the panel door.