What the ratings mean for fit
The Siemens SENTRON 3VA2225-5HL42-0DL0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a maximum interrupting capacity of 187 kA at 240 V AC. That 187 kA rating at 240 V means it handles high-fault scenarios common on the secondary side of large distribution transformers — a panel fed by a 1,000 kVA transformer at 208Y/120 V can see fault currents well above 100 kA, and this breaker clears them without cascading upstream. The 250 A continuous rating is the same across 40 °C to 50 °C, so you don't lose capacity in a warm enclosure; derating starts at 55 °C, dropping to 213 A at 70 °C. The 86 mm depth and 140 mm width fit the standard SENTRON 3VA panel footprint — drops into the same mounting cutout as other 3VA2 frame breakers.
Breaking capacity across voltages
Interrupting rating varies with system voltage: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V. The steep drop at 690 V is typical for this frame class — the arc extinction limits at higher voltages. For a 480 V distribution panel (common in North America), the 75.6 kA at 500 V is the relevant figure; for 400 V IEC systems, the 121 kA at 415 V applies. The minimum rated current is 375 A, which means this breaker is sized for a 250 A continuous load but can be adjusted up to 2,500 A maximum via the electronic trip unit — it's a 250 A frame with a wide adjustment band, not a fixed 250 A device.
Panel integration and thermal management
The 86 mm depth and 140 mm width mean it occupies the same DIN-rail or mounting-plate footprint as other 3VA2 frame breakers — no panel rework if you're swapping from a different 3VA2 variant. Maximum power loss is 50.5 W, which drives the thermal derating: at 55 °C the continuous rating drops to 241 A, at 60 °C to 232 A, at 65 °C to 222 A, and at 70 °C to 213 A (–). If the panel ambient runs above 50 °C, size the breaker for the derated value, not the nameplate 250 A. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The undervoltage release is factory-installed — verify coil voltage matches your control circuit before wiring.