The SENTRON 3VA1112-4EF32-0DA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 125 A from 40 °C through 50 °C, derating to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. The interrupting capacity reaches 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V — figures that define the fault-current headroom for panel coordination studies.
SCCR and selectivity
With 121 kA at 240 V and 75.6 kA at 415 V, this MCCB sits above typical distribution panel SCCR requirements for most commercial and light industrial installations. The undervoltage release (UVR) integrated into the auxiliary release design provides a clean trip on loss of control voltage — common in emergency-stop chains or undervoltage protection schemes. No communication module is fitted, so this is a standalone protective device, not a smart breaker.
That 3-inch width and 2.76-inch depth fit standard MCCB cutouts in SENTRON distribution panels and most third-party enclosures designed for 3-pole 125 A frames. The basic switch supplied is order code 3VA11124EF320AA0 — relevant if you need a replacement switching mechanism or are cross-referencing internal subassemblies. Maximum power loss is 30.6 W, which should be factored into enclosure thermal calculations, especially when multiple breakers are ganged.