Key ratings and what they mean for fit
The 3VM1225-3EE32-0AA0: The 250 A rating at 40 °C is the continuous current the breaker carries without tripping under normal ambient conditions. At 55 °C it derates to 243.3 A, and at 70 °C to 223 A — so if your panel runs hot, the effective rating drops. The interrupting capacity of 76 kA at 240 V and 53 kA at 415 V tells you the maximum fault current it can safely clear at those voltages; for 500 V systems the rating drops to 12 kA. The TM220 overcurrent release is a thermal-magnetic design — thermal for overload protection, magnetic for short-circuit — with no electronic trip unit, so no adjustable curves or communication. Rated insulation voltage of 800 V means the internal clearances and creepage distances are designed for 800 V systems, though the interrupting ratings cap the usable voltage. The 3-pole configuration covers three-phase loads. IP40 on the front means protection against tools and small wires entering the front face, but not against water — keep it inside a dry enclosure.
Where this MCCB fits in a panel
At 105 mm wide, 158 mm high, and 70 mm deep, this breaker occupies a standard 3-pole MCCB footprint on a DIN rail or panel-mount base. The 57 W maximum power loss at full load needs to be factored into the enclosure thermal budget — don't crowd it against heat-sensitive components. No undervoltage release, no shunt trip, no ground-fault monitoring: it's a bare line-protection breaker with no accessories. If your circuit needs undervoltage protection or remote tripping, you'll need to add an external module or choose a different variant.