The Siemens SENTRON 3VA2225-5JQ32-0KA0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection, rated 250 A continuously at ambient temperatures from 40 °C to 50 °C without derating. At 55 °C it carries 238 A, at 60 °C 225 A, at 65 °C 213 A, and at 70 °C 200 A — so the full 250 A rating holds only up to 50 °C; above that, the thermal derating curve governs the actual continuous current in the panel.
Breaking capacity and selectivity
This MCCB delivers 187 kA interrupting capacity at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V. The 187 kA figure at 240 V puts it in the high-interrupting category for a 250 A frame — useful where available fault current is high (e.g., near a transformer secondary). The steep drop to 4.5 kA at 690 V means it is not intended for 690 V line-side applications with significant fault current; at that voltage the breaker is essentially a load-break switch, not a full-fault protector.
Physical fit and panel integration
Dimensions are 181 mm height, 105 mm width, 86 mm depth. The 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame size — it occupies three 35 mm DIN-module positions on the rail. The 86 mm depth leaves clearance behind a 200 mm deep enclosure door; verify the handle protrusion if mounting in a shallow gland plate.
Release configuration and communication
Includes a shunt trip (STL) auxiliary release for remote tripping and a communication function. No undervoltage release or auxiliary switch fitted. Electronic trip unit set for 250 A full-scale with 50 A initial pickup.