The Siemens SENTRON 3VA1112-4EF42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection at 125 A continuous current (Iu) at 40 °C, with a thermal-magnetic TM240 overcurrent release. It delivers a breaking capacity of 121 kA at 240 V AC, tapering to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500 V and 690 V — covering typical industrial distribution voltages from 240 V through 690 V.
The 125 A rating holds flat up to 50 °C ambient; above that, derate to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. Maximum power loss is 28.1 W — relevant for panel thermal budgeting in high-density enclosures.
Dimensions: 130 mm height, 101.6 mm width, 70 mm depth. Mounts in a standard panel cutout; the 4-pole footprint matches the SENTRON 3VA platform. An optional motor drive is available for remote operation.