Siemens SENTRON 3VA2225-6JQ32-0BA0 — 250 A MCCB with 242 kA breaking capacity
The Siemens SENTRON 3VA2225-6JQ32-0BA0 is a 3-pole molded case circuit breaker rated for line protection, carrying a continuous current of 250 A at 40 °C ambient. Its interrupting capacity hits 242 kA at 240 V AC — that is the figure that decides whether this breaker clears a high-fault bus without upstream coordination issues. At 415 V and 440 V it still holds 187 kA, dropping to 121 kA at 500 V and 4.5 kA at 690 V. The thermal derating curve is published: full 250 A holds through 50 °C, then steps down to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. That means in a warm panel — say 55 °C internal ambient — you lose 12 A of headroom; plan the load accordingly. This MCCB includes an undervoltage release (UVR) as the auxiliary release design, and it supports communication functions — so it can report status or accept remote trip signals in a monitored distribution system. The power loss at full rated current is 50.5 W maximum, which matters for ventilation planning inside a sealed enclosure. Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep — a 3-pole frame that fits standard SENTRON panel cutouts and busbar arrangements.
Panel fit and integration notes
The 86 mm depth and 105 mm width match the standard SENTRON 3VA molded-case footprint. It mounts on a DIN rail or directly to a backplate via the frame's screw-down lugs. The undervoltage release coil draws from the control circuit; verify the supply voltage matches the UVR rating on the nameplate before energizing. Communication wiring passes through the auxiliary terminal block — no special shielding required for the basic status signals.