What this MCCB delivers for the panel
The Siemens 3VA2225-6HL32-0DA0 is a 3-pole SENTRON molded case circuit breaker rated for 250 A continuous current at 40 °C, carrying a 242 kA interrupting rating at 240 V AC — enough to handle high-fault utility feeds or transformer secondaries without cascading upstream. The ETU320 electronic trip unit provides adjustable overload and short-circuit protection curves, letting you coordinate selectivity downstream without swapping trip packs. Built-in undervoltage release (UVR) drops the breaker on loss of control voltage — a standard requirement for emergency-stop circuits and safety disconnects in machinery panels.
Breaking capacity across voltage levels
Rated breaking capacity holds at 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 6 kA at 690 V — the 690 V figure is the weak point for 480 V delta systems, so verify your available fault current against that column.
Thermal derating and power dissipation
Full 250 A rating holds through 50 °C; above that it derates linearly to 213 A at 70 °C. Plan your enclosure ventilation if the breaker sits near other heat sources — maximum power loss is 50.5 W.
Panel fit and dimensions
Dimensions are 105 mm wide, 181 mm high, 86 mm deep — standard 3-pole MCCB footprint for DIN-rail or screw-mount installation. The 86 mm depth leaves clearance for rear-connected busbars in most distribution panels.