The Siemens SENTRON 3VA1040-3ED36-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated 40 A continuous at 40 °C ambient, with a 75.6 kA interrupting capacity at 240 V AC — enough to clear a high-fault panel feeder without cascading upstream. It's designed for line protection, so the thermal-magnetic trip curve is set for feeder and main breaker duty, not motor-starting. That means you get both status feedback and a UVR coil that drops the breaker if control voltage falls — common on safety circuits or emergency-stop chains where a loss of control power should open the main.
Interrupting ratings across voltages
The interrupting capacity steps down as voltage climbs: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V (–). At 690 V the 7.5 kA limit means this breaker is not a fit for high-fault 690 V drives or transformer secondaries without a current-limiting upstream device.
The 40 A rating holds flat from 40 °C through 50 °C (–), then derates to 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C (–). In a sealed panel with multiple breakers ganged, expect to use the 55 °C or 60 °C column.