That 125 A figure holds flat from 40 °C through 50 °C, then derates to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C — so in a warm panel you lose about 9% of capacity by 70 °C. The interrupting ratings are 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 75.6 kA at 240 V is the headline number for high-fault service-entrance applications; the 52.5 kA at 415 V covers most European industrial distribution. Four poles with 100% N-conductor protection mean the neutral is switched and protected at full ampacity — no derating for the neutral path.
The 3VA1112-3GD42-0AA0 measures 130 mm high, 101.6 mm wide, and 70 mm deep. The 101.6 mm width (4 inches) for a 4-pole MCCB is standard for the SENTRON 3VA platform; verify the mounting hole pattern against your existing backplate or DIN-rail adapter if retrofitting.
Key specifications at a glance
The breaker has no communication function and no ground-fault monitoring version. An optional motor drive is available as a product extension.