SENTRON 3VA1112-4EE42-0AA0 — 125 A MCCB, TM220 Release
Breaking capacity is the headline here: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V.
Thermal Derating and Ambient Conditions
The 125 A rating holds up to 50 °C ambient. Above that, derating is gradual: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. If this MCCB sits near hot equipment — like a drive cabinet or near a furnace zone — you need to factor that curve rather than relying on the 125 A nameplate. Maximum power loss is 28.1 W — that's the heat it dumps into the enclosure. In a densely packed panel, that adds up; ensure adequate ventilation or forced cooling if multiple breakers are ganged.
Dimensions are 70 mm depth, 101.6 mm width, 130 mm height — standard 4-pole MCCB footprint for DIN-rail or panel-mount integration.