The Siemens 3VA1225-6EF42-0JC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 250 A at 40 °C, derating to 223 A at 70 °C, which means the full 250 A is available in most standard panel environments — only above 55 °C does the rating start to drop. That 250 A holds flat from 40 °C through 50 °C, so there's headroom for warm enclosures without forced derating.
Interrupting capacity across voltage levels
This 4-pole MCCB delivers 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. Those numbers cover the full range of common low-voltage fault levels — the 220 kA at 240 V handles high-fault service-entrance applications, while the 17 kA at 690 V still exceeds most industrial motor-circuit requirements. The rated insulation voltage is 800 V, so the breaker is built for 690 V systems with margin.
Integrated accessories and footprint
The breaker ships with a shunt trip (STL) release and two auxiliary switches (HQ type) factory-fitted — no field-assembly of those accessories. It measures 140 mm wide, 158 mm high, and 70 mm deep, which is the standard 4-pole SENTRON 3VA form factor. That 70 mm depth is the same as the 3-pole sibling, so it fits the same panel depth. No undervoltage release or ground-fault monitoring is included; those would need a different order code.