What this MCCB carries and where it fits
The Siemens 3VA2225-7HN32-0CH0 is a SENTRON 3VA2 molded case circuit breaker in the line-protection version, rated for a continuous current Iu of 250 A and built around the ETU350 electronic trip unit. It carries a 330 kA breaking capacity at 240 V — that figure drops to 242 kA at 415 V and 440 V, then to 187 kA at 500 V, and finally to 6.3 kA at 690 V, so the SCCR headroom you get depends on the system voltage. The 3-pole frame is sized for panel mounting; dimensions are 105 mm wide, 181 mm high, and 86 mm deep, which is the standard 3VA2 footprint for this current class. The undervoltage release (UVR) is integrated as standard — part number 3VA9608-0BB24 for the auxiliary trip — and the auxiliary contact block carries 2 auxiliary switches plus 1 trip alarm switch (HQ designation). That means the breaker can signal its state back to a PLC or safety relay without an add-on module, which simplifies the control wiring in a panel.
Thermal derating and real-world current
The 250 A rating holds flat from 40 °C through 50 °C ambient. At 55 °C it derates to 241 A, at 60 °C to 232 A, at 65 °C to 222 A, and at 70 °C to 213 A. If this breaker sits in a warm enclosure — say a non-ventilated panel next to drives or transformers — the 55 °C derate is the one to size against. Maximum power loss is 50.5 W, which matters for the enclosure thermal budget.