What this 250 A MCCB delivers for a hot, dusty line
The Siemens 3VA2225-5HN32-0HA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current — that's the full 250 A at 40 °C ambient, and it holds that same 250 A all the way up to 50 °C before it starts to derate (241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, 213 A at 70 °C). Breaking capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V — so it handles high-fault-current scenarios across common industrial voltages without cascading failure upstream.
Sizing and thermal reality in a cement plant panel
The thermal derating curve matters when this breaker sits in a crowded, hot enclosure near a kiln or preheater. At 70 °C ambient it's still good for 213 A — not the full 250 A, but still useful headroom for a 200 A feeder. If your panel hits 70 °C and you need the full 250 A, you'll need to either ventilate or step up to a higher-frame breaker. Maximum power loss is 48 W — that's the heat it dumps into the enclosure at rated load.