The Siemens SENTRON 3VA2225-6JQ32-0AG0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 250 A at 40 °C and a maximum breaking capacity of 242 kA at 240 V. The interrupting curve drops to 187 kA at 415 V and 440 V, then to 121 kA at 500 V, and 4.5 kA at 690 V — the voltage step matters for the fault-current study on your distribution board. The 250 A rating holds through 50 °C; above that the thermal derating begins: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, 200 A at 70 °C. If your panel ambient runs hot, size the breaker for the derated figure, not the nameplate.
Mounting and integration
The 3VA2225-6JQ32-0AG0 measures 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA frame that fits the existing DIN-rail or screw-mount pattern in most LV switchboards. The 3-pole footprint leaves room for side-mounted auxiliary and trip-alarm switches; this unit ships with one auxiliary switch and one trip alarm switch (HP design) already installed. No auxiliary release is fitted, so if you need undervoltage or shunt trip, that has to be added separately.
Communication and trip unit
The breaker includes a communication function, which means the electronic trip unit can report status and measured values over a bus — useful for a power-monitoring scheme or a remote-trip indication. The trip indicator is present, so a local mechanical flag confirms the breaker has opened on a fault. The full-scale value of the trip unit is 250 A, with an initial setting of 50 A, giving a 5:1 adjustment range for coordinating with downstream loads.