The Siemens SENTRON 3VA1112-4EF32-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated 125 A continuous at 40 °C, with an interrupting capacity of 121 kA at 240 V AC and 75.6 kA at 415 V AC.
Interrupting curve — where the real headroom lives
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 500 V or 690 V. If your panel's available fault current at 480 V is, say, 65 kA, this breaker won't hold — the 52.5 kA at 440 V is the closest published point, and at 480 V the actual rating is lower still. For 480 V applications with high fault current, step up to a higher-rated frame. The 11.9 kA at 500/690 V confirms it's not a 690 V main breaker for high-fault installations.
The 3VA1112-4EF32-0KH0 measures 130 mm high, 76.2 mm wide, and 70 mm deep.
Auxiliary hardware — what's on board and what's not
The shunt trip lets a PLC or safety relay cut power on command; the alarm switch signals a trip event back to the control system. If you need undervoltage protection or ground-fault sensing, that's an add-on or a different variant.
Thermal derating — don't cook the trip curve
Rated 125 A from 40 °C through 50 °C, then derates linearly: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, 114 A at 70 °C.