What it is and what it does
The Siemens 3VA2325-5HN32-0DH0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, three-pole, configured for line protection with an ETU350 electronic trip unit and an integrated undervoltage release (UVR). It carries interrupting ratings of 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — giving you headroom for high-fault-capacity distribution panels where selectivity with downstream breakers matters. The auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm switch (HQ type), and the supplied basic switch is order code 3VA2325-5HN32-0AA0 with an integrated auxiliary trip coded 3VA9608-0BB25.
Sizing and thermal derating
The 250 A rating holds flat from 40 °C through 50 °C, then derates to 240 A at 55 °C, 235 A at 60 °C, 230 A at 65 °C, and 225 A at 70 °C — so in a warm enclosure you lose roughly 10% of capacity by the top of the operating range. Maximum power loss is 40 W, which matters for panel thermal budgeting when grouping several breakers in a closed cabinet. Dimensions are 138 mm wide, 248 mm high, 110 mm deep — a standard 3-pole MCCB footprint that fits most SENTRON mounting bases and busbar systems.