MCCB for line protection with ETU850 trip unit
The Siemens SENTRON 3VA2110-5KP32-0BA0 is a 3-pole molded case circuit breaker rated for 100 A continuous current (Iu). It carries a 187 kA breaking capacity at 240 V, dropping to 121 kA at 415 V and 440 V, and 79 kA at 500 V — enough for high-fault utility feeds or transformer secondaries. The ETU850 electronic trip unit gives adjustable protection curves, and the breaker includes an undervoltage release (UVR) plus a communication function for integration into a plant monitoring system.
What the ratings mean for panel fit
The 100 A rating holds from 40 °C up to 50 °C, then derates to 96.25 A at 55 °C and 85 A at 70 °C — so in a warm enclosure you lose headroom above 50 °C. The 800 V rated insulation voltage (Ui) means it can sit on a 690 V line without derating the insulation. Depth is 86 mm, width 105 mm, height 181 mm — standard SENTRON 3VA frame size, so it drops into existing panel layouts without re-drilling.