What it is and what it does
The Siemens SENTRON 3VA2325-7MN32-0AF0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous at ambient temperatures from 40 °C up to 70 °C — no derating needed across that band, which simplifies panel sizing in warm enclosures. It is designed specifically for motor protection, with built-in phase failure detection and a trip indicator. The interrupting capacity hits 330 kA at 240 V, dropping to 242 kA at 415 V and 440 V, then 187 kA at 500 V, and 7.5 kA at 690 V — so it handles high-fault utility feeds downstream of a transformer but watch the steep drop at 690 V.
What the ratings mean for fit
The 250 A continuous rating is flat from 40 °C to 70 °C — that is unusual and valuable for a panel sitting near a furnace or motor drive cabinet where internal temps climb. The trip delay is adjustable between 4 s and 17 s (minimum and maximum), giving you time to ride through motor inrush without nuisance tripping. The auxiliary switch configuration is 1 auxiliary switch plus 1 trip alarm switch (HQ type), which is enough to signal a trip back to a PLC or annunciator but not overloaded with contacts. Power loss maxes at 37.5 W — factor that into enclosure heat rise if you are stacking several breakers.
Panel integration notes
The breaker measures 138 mm wide, 248 mm high, and 110 mm deep. It mounts on a DIN rail or can be screw-fixed to a backplate. The basic switch variant is 3VA2325-7MN32-0AA0; this order code adds the auxiliary and trip alarm switches pre-installed. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. No undervoltage release, no ground-fault monitoring, no communication function — it is a straight motor-protection MCCB with phase failure detection.