The Siemens SENTRON 3VA1010-4ED42-0BH0 is a 4-pole molded case circuit breaker (MCCB) rated for 100 A continuous current at 40 °C, with a breaking capacity of 121 kA at 240 V AC. It's built for line protection — meaning it sits at the feeder or main distribution point, not downstream on a motor branch.
Breaking capacity and derating
This breaker's interrupting rating drops as voltage climbs: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That's a steep curve — at 690 V it's still adequate for most industrial distribution, but you lose the massive headroom you get at 240 V. The current rating holds at 100 A from 40 °C through 50 °C, then steps down: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C.