What this MCCB carries and where it sits
The Siemens 3VA2225-5JQ42-0AA0 is a SENTRON molded case circuit breaker rated 250 A continuous, 4-pole, designed for line protection. It breaks up to 187 kA at 240 V and 121 kA at 415 V, with a rated insulation voltage of 800 V. The 86 mm depth and 140 mm width fit standard panel layouts, and the unit includes a communication function for integration into monitored distribution.
Breaking capacity and thermal derating — the real limits
The interrupting rating drops from 187 kA at 240 V to 121 kA at 415 V and 440 V, then to 75.6 kA at 500 V, and 4.5 kA at 690 V. That 690 V figure is the hard ceiling; if your fault current at that voltage exceeds 4.5 kA, this breaker won't clear it. Thermal derating is linear from 55 °C upward: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, 200 A at 70 °C. Below 55 °C, the full 250 A holds. Ambient in the panel matters — a hot enclosure derates the breaker before it trips on overload.
Ground-fault and communication
Ground-fault monitoring uses summation current formation on the L + N conductor — it sees the vector sum, not a separate sensor. The communication function allows remote monitoring or trip indication, though the trip indicator itself is not fitted on this variant. No undervoltage release or voltage trigger is included.