What the ratings mean for fit
The Siemens SENTRON 3VA1112-3EE46-0AA0 is a 4-pole molded case circuit breaker rated 125 A continuous at 45 °C and 50 °C, derating to 114 A at 70 °C — so the thermal curve starts pulling back above 55 °C, which matters if this lands in a non-ventilated enclosure next to other heat sources. The TM220 thermal-magnetic release gives an adjustable short-circuit pickup up to 1250 A, meaning you can dial the magnetic trip to ride through motor inrush without nuisance tripping. Breaking capacity runs 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — that covers most North American and European distribution panels, but at 500 V and 690 V it drops to 11.9 kA, so verify the available fault current at the point of installation if you're feeding a 690 V drive.
Panel integration and physical fit
At 70 mm deep, 101.6 mm wide, and 130 mm tall, this breaker fits standard SENTRON mounting bases and panel cutouts. The IP40 front protection means it's suitable for enclosed distribution boards — not washdown environments, but fine inside a typical industrial panel. The 4-pole format handles three-phase plus neutral switching, common for European-style TN-S or TN-C-S systems where the neutral needs isolation. Max power loss of 28.1 W at full load should be factored into enclosure thermal calculations.