Breaking capacity — what the voltage columns mean for your fault level
The 3VA1112-6EF32-0AG0: This MCCB's interrupting capacity is voltage-dependent, which is typical for a molded-case breaker but critical to match to your system's available fault current. At 240 V it interrupts 220 kA; at 415 V it handles 154 kA; at 440 V it drops to 75.6 kA; at 500 V and 690 V it holds at 17 kA. At 690 V the 17 kA figure is modest; verify your transformer's secondary fault current if using this breaker on a 690 V line.
Thermal derating — the 125 A rating is not flat across temperature
The 125 A rating holds from 40 °C through 50 °C, then begins to step down: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C.
Physical fit and auxiliary configuration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint for DIN-rail or panel-mount installation. The basic switch order code is 3VA11126EF320AA0, which is the core switching mechanism; the -0AG0 suffix adds the specific factory-installed accessories.