Siemens 3VA1112-5GE42-0AA0 — 125 A, 4-Pole SENTRON MCCB for Line Protection
It carries a TM220 thermal-magnetic overcurrent release and provides 100% N-conductor protection, meaning the neutral pole is fully rated and switched with the phase poles — no derating needed for unbalanced loads or harmonic-rich circuits. The interrupting ratings span the common industrial voltages: 187 kA at 240 V AC, 121 kA at 415 V AC, 75.6 kA at 440 V AC, and 17 kA at both 500 V and 690 V AC. Power loss at rated load is 28.1 W — a useful figure for enclosure thermal calculations when packing several breakers in a single panel.
Current Ratings Across Temperature
Above that it derates gradually: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C.
Dimensions: 130 mm height, 101.6 mm width, 70 mm depth. Front-side IP40 protection means it's splash-proof on the face but not sealed; keep it inside a rated enclosure for washdown areas.