The Siemens SENTRON 3VA2225-6HN32-0JA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current across a 40 °C to 50 °C ambient range, making it a line-protection device for distribution panels and feeder circuits. It carries a shunt trip release (STL) for remote tripping, and its breaking capacity reaches 242 kA at 240 V — sufficient for high-fault utility connections or transformer secondaries. Physically, it measures 181 mm high by 105 mm wide by 86 mm deep, fitting standard MCCB panel cutouts and DIN-rail adapter kits for retrofit into existing SENTRON or legacy 3VL switchboards.
Breaking capacity and derating
The interrupting ratings vary sharply with system voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4.5 kA at 690 V. This is typical for a current-limiting MCCB — the arc-quenching design is most effective at lower voltages. For 690 V applications, verify the available fault current stays under 4.5 kA, or step up to a higher-rated frame. Thermal derating begins above 50 °C: still 250 A at 50 °C, then 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If the panel ambient runs hot, the continuous current must be adjusted accordingly. Maximum operating temperature is 70 °C; storage range is -40 °C to 80 °C. Power loss is 48 W at rated load — relevant for thermal management inside a sealed enclosure. The shunt trip release (STL) is factory-fitted; the basic switch is a 3VA2225-6HN32-0AA0 subassembly, but the 0JA0 suffix includes the trip coil. No auxiliary switches, undervoltage release, or ground-fault module are included on this variant.