The Siemens SENTRON 3VA1120-3EF36-0KA0 is a 3-pole molded case circuit breaker rated for 20 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. It is configured as a line protection device — meaning its trip curve and interrupting rating are tuned for feeder and distribution circuits, not motor starting duty.
Breaking capacity across voltages — where this fits in a distribution scheme
This breaker delivers 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. If your panel feeds a 690 V bus, verify that 10.5 kA exceeds the available fault current; otherwise step to a higher-rated 3VA variant.
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.