The Siemens 3VA1132-4EE42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 32 A continuous current across its 4-pole frame. It carries a TM220 thermal-magnetic release — fixed thermal and magnetic trip settings, no adjustability on the I²t curve. The interrupting ratings tell the real story: 121 kA at 240 V AC, dropping to 75.6 kA at 415 V, then 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V (–). That 121 kA figure at 240 V means it handles high available fault current on the secondary side of a step-down transformer or a 240 V distribution panel without cascading upstream. At 415 V it still clears 75.6 kA — enough for most industrial main feeders. The 11.9 kA at 690 V is the tail-off point; for a 690 V motor control center, verify the available fault current stays under that.
Thermal derating and panel fit
The 32 A rating holds flat from 40 °C to 50 °C, then drops only 1 A per 5 °C step: 31 A at 55 °C and 60 °C, 30 A at 65 °C and 70 °C (–). That's a shallow derating curve — useful when the MCCB sits in a warm enclosure alongside other heat sources. The front face is IP40 rated, so it's protected against solid objects over 1 mm but not sealed against moisture; keep it inside a panel, not in a washdown zone. Dimensions are 130 mm high, 101.6 mm wide, 70 mm deep (–). The 101.6 mm width is a standard 4-inch frame — fits common DIN-rail or panel-mount footprints without surprises. Max power loss is 10.6 W; that's the heat you need to vent if the panel is tightly packed.