What it is and what it does
The Siemens 3VA2325-7MN32-0HL0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) designed specifically for motor protection. It carries a continuous current rating of 250 A across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel sizing when the breaker sits near other heat sources. Three-pole construction, with a symmetrical breaking capacity that peaks at 330 kA at 240 V and stays at 242 kA through the 415–440 V band, then 187 kA at 500 V, and 7.5 kA at 690 V. That 330 kA figure at 240 V means it can interrupt a fault current of that magnitude without the arc re-striking — relevant for high-capacity transformer-fed panels where the available fault current is substantial. The breaker includes phase failure detection and a trip indicator, plus a voltage trigger for remote signaling. It ships with a shunt trip release (STL) and a complement of auxiliary switches: two auxiliary switches, one trip alarm switch, and one electrical alarm switch. That switch complement gives the panel builder a full set of status feedback contacts without needing to order separate modules.
Integration and mounting
Dimensions are 248 mm high, 138 mm wide, 110 mm deep. The 110 mm depth fits standard enclosures with room for wiring gutters. Maximum power loss is 37.5 W. In a sealed, non-ventilated enclosure that heat load drives the internal temperature rise; account for it when calculating the enclosure's thermal budget, especially if the panel also houses drives or transformers. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage minimum is the more restrictive number for warehousing — the breaker can sit in an unheated warehouse down to -40 °C without damage, but it must be above -25 °C before energizing.