The Siemens SENTRON 3VA1120-4EF32-0HC0 is a 3-pole molded case circuit breaker rated for a continuous current Iu of 20 A, with a TM240 thermal-magnetic release. Its interrupting capacity hits 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that cover most industrial distribution panels and motor branch circuits. At 690 V it still holds 11.9 kA, so it handles the high-voltage end of a 690 VAC line without cascading upstream.
The 20 A rating holds flat from 40 °C to 50 °C. Above that it derates: 19.2 A at 55 °C, 18.8 A at 60 °C, 18.4 A at 65 °C, and 18 A at 70 °C. If the panel ambient runs above 50 °C, the continuous load must be reduced accordingly — the TM240 release is calibrated for the 40 °C reference, not the 70 °C operating maximum. The 15000-cycle latching endurance is typical for this class; expect it to outlast the panel's service life in normal switching duty. Dimensions are 76.2 mm wide, 130 mm tall, and 70 mm deep. The width matches the standard 3VA 3-pole footprint, so it drops into the same DIN-rail or screw-mount cutout as the rest of the SENTRON 3VA family.