The Siemens SENTRON 3VA1110-4EF32-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated 100 A at 40 °C, designed for line protection in distribution panels. Its interrupting capacity hits 121 kA at 240 V and 75.6 kA at 415 V, giving solid headroom for high-fault utility feeds or transformer secondaries where a standard MCB would weld shut.
Ratings in context
Thermal current holds flat at 100 A from 40 °C up to 50 °C, then derates gradually to 91 A at 70 °C. That means a panel at 50 °C ambient still gets the full 100 A rating — no early downsizing. The 800 V rated insulation voltage (Ui) covers 480 V and 600 V class systems with margin. Interrupting ratings step down with system voltage: 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. For a 415 V industrial feed this breaker clears a bolted fault up to 75.6 kA without cascading upstream — selectivity studies should use that figure as the let-through boundary. Power loss is 27.5 W at rated load. That's the heat the panel builder must vent; in a sealed enclosure with multiple breakers side by side, the cumulative dissipation drives the cooling calculation.
Fit and integration
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep. The 3-pole footprint matches the standard SENTRON 3VA mounting pattern — existing busbar and DIN-rail layouts for earlier 3VA frames accept this unit without drilling or adapter plates. Ships with an undervoltage release (UVR) fitted and a complement of 2 auxiliary switches plus 1 trip alarm switch (HQ). The UVR ensures the breaker trips on loss of control voltage — common in emergency-stop chains or undervoltage protection schemes. The auxiliary contacts give status feedback to a PLC or annunciator panel.