What this MCCB delivers on the line side
The Siemens SENTRON 3VA1225-6EF42-0HC0 is a 4-pole molded case circuit breaker rated 250 A at 40 °C, sized for line protection in distribution panels. Its interrupting capacity hits 220 kA at 240 V AC and 154 kA at 415 V AC — figures that cover high-fault utility feeds and transformer secondaries without cascading upstream. The 800 V rated insulation voltage gives headroom for 690 V industrial networks.
Breaking capacity across voltages — what it means for your SCCR
This 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. For a 480 V panel, the 75.6 kA rating at 440 V is the closest published figure; the 30 kA at 500 V covers 480 V systems with margin. The 17 kA at 690 V suits European 690 V motor control centers. These values define the available fault current the breaker can safely interrupt — critical for SCCR compliance under UL 508A or IEC 61439.
Thermal derating and continuous current
Rated 250 A continuously at 40 °C, 45 °C, and 50 °C. Derating starts at 55 °C: 243 A, then 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 57 W. The 4-pole frame fits a 140 mm wide × 158 mm high × 70 mm deep footprint — standard for SENTRON 3VA plug-in or fixed mounting.
Auxiliaries and releases built in
Factory-fitted with a shunt trip (STL) release and 2 auxiliary switches HQ. No undervoltage release, no ground-fault monitoring, no communication function. The basic switch supplied is 3VA12256EF420AA0. Trip indicator is not present; voltage trigger is present. This variant is configured for line protection with the shunt trip for remote opening — typical for emergency-off or interlocking circuits.