Siemens 3VA1225-5EF42-0BA0 SENTRON MCCB, 250 A, 4-Pole, TM24

Interrupting capacity and coordination

This MCCB delivers 187 kA interrupting capacity at 240 V, stepping down to 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. The rated insulation voltage is 800 V, so the breaker is suitable for 480/277 V and 600/347 V systems with headroom.

The 250 A rating holds from 40 °C through 50 °C, then derates to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. Maximum power loss is 59.5 W — a factor for enclosure heat rise calculations when grouping multiple breakers.

The 4-pole body at 140 mm width occupies four standard 35 mm DIN-rail module spaces (each pole ~35 mm).