What this MCCB delivers
The Siemens 3VA1112-5EE42-0AA0 is a 4-pole SENTRON molded case circuit breaker rated for line protection. It carries a continuous current of 125 A up to 50 °C, derating to 114 A at 70 °C — per the datasheet, the thermal-magnetic TM220 release holds the full 125 A across the typical panel ambient range before the thermal curve starts pulling back above 55 °C. The interrupting ratings are the headline: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That 187 kA figure at 240 V puts it well into high-fault-duty territory — suitable for main or feeder positions where the available fault current is substantial. The 690 V rating of 17 kA is the ceiling for the rated operating voltage. Rated insulation voltage is 800 V, and the front face carries IP40 protection — enough for a clean indoor panel, but not for washdown environments. The 28.1 W maximum power loss at rated current is a number to factor into enclosure thermal calculations if the panel is densely packed.
Integration and panel fit
The 3VA1112-5EE42-0AA0 measures 130 mm high, 101.6 mm wide, and 70 mm deep. The 4-pole width (101.6 mm) is the key dimension for busbar or DIN-rail spacing — confirm the panel cutout accommodates that width plus the required clearance for arc chute venting and cable bending radius. No undervoltage release, no communication module, no ground-fault monitoring on this variant; it is a straight thermal-magnetic line-protection breaker.