What it is and what it does
The Siemens 3VA2225-7KP32-0CH0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current in a 3-pole configuration, designed for line protection duty. Its interrupting capacity hits 330 kA at 240 V and 242 kA at 415 V — that's the fault-clearing muscle for high-available-fault-current panels where a standard MCCB would weld shut. The 250 A frame carries a thermal derating curve that holds full rating up to 50 °C, then steps down: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. That matters when you're packing breakers into a warm enclosure — the 50 °C ceiling buys you headroom most 80%-rated frames don't.
Key ratings and what they mean for fit
Breaker frame size is 375 A minimum to 2 500 A maximum, so this 250 A continuous rating sits well inside the frame's capability — you're not pushing the thermal limits. The 3-pole design with undervoltage release (UVR) means it drops out on loss of control voltage, which is standard for emergency-stop or safety-related disconnect circuits where you need positive opening on power loss. It ships with the basic switch 3VA2225-7KP32-0AA0 and includes 2 auxiliary switches plus 1 trip alarm switch (HQ type) — that gives you remote status indication without adding external relay logic. Communication function is built in, so it can talk to a higher-level system for power monitoring or selective coordination schemes.
Breaking capacity across voltages
The interrupting ratings cover the common distribution voltages: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 4.5 kA at 690 V. That 4.5 kA figure at 690 V is the pinch point — if your system runs 690 V with high fault current, this breaker's not your choice. But for 240–500 V distribution, those numbers give you selectivity headroom for downstream breakers. Maximum power loss is 50.5 W, which factors into enclosure thermal calculations when ganging multiple breakers.
Physical fit and panel integration
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. That 86 mm depth is the mounting depth behind the panel face — important for shallow enclosures or when back-panel clearance is tight behind a DIN-rail array. The width at 105 mm for a 3-pole frame is standard for this class; check your busbar or lug spacing against the terminal pattern before committing. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. The trip indicator is present, so you get a visual flag on fault without needing to meter it.