What this MCCB delivers on the line
The Siemens SENTRON 3VA1112-6EF46-0AA0 is a 4-pole molded case circuit breaker rated at 125 A continuous current (Iu) with a TM240 thermal-magnetic release. Its interrupting capacity hits 220 kA at 240 V and 154 kA at 415 V, so it handles high-fault scenarios like transformer secondaries or large motor feeders without cascading upstream. The 70 mm depth and 101.6 mm width mean it fits standard distribution panel cutouts — no extra gland-plate work for a retrofit.
Breaking capacity across voltages — what the numbers mean
At 240 V the 220 kA rating covers most US-style panelboard faults. At 415 V it still delivers 154 kA, enough for industrial switchgear with high available fault current. At 690 V it drops to 17 kA — still adequate for 690 V motor circuits in European installations, but verify your system's prospective short-circuit current at that voltage.
Thermal derating and power loss
Rated 125 A at 45 °C and 50 °C, it holds that current without derating. At 55 °C it's 122 A, at 60 °C it's 120 A, at 65 °C it's 117 A, and at 70 °C it's 114 A. Maximum power loss is 28.1 W — factor that into enclosure ventilation if you're packing multiple breakers in a sealed cabinet.
Panel fit and integration
Mounts on a DIN rail or directly to a panel backplate. The IP40 front protection means it's suited for indoor distribution boards — not washdown areas. The 4-pole design handles three-phase plus neutral, common for North American and European 4-wire systems. Optional motor drive accessory (listed as available) allows remote tripping or reset.