Siemens 3VA1225-4EF42-0BC0 — 250 A SENTRON MCCB for Line Protection
The Siemens 3VA1225-4EF42-0BC0 is a 4-pole SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a maximum interrupting capacity of 121 kA at 240 V.
Interrupting Capacity and Selectivity Planning
The interrupting capacity varies by line voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V. For a 400 V panel, the 75.6 kA rating gives substantial SCCR headroom above typical 25–65 kA available fault currents, making this breaker suitable for high-fault installations like industrial substations or large motor control centers.
Dimensions are 158 mm height, 140 mm width, and 70 mm depth. The 140 mm width is the 4-pole footprint — plan for a 4-module wide cutout if mounting on a DIN rail adapter plate.