Siemens 3VA2325-5MN32-0KL0 — 250 A Motor Protection MCCB
The Siemens 3VA2325-5MN32-0KL0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection, with a 250 A rating held flat across the full 40 °C to 70 °C ambient range — no derating needed as the panel warms up. Three-pole construction with integrated phase failure detection, meaning it catches a lost phase on the line side and trips before single-phasing damages the motor windings. Breaking capacity runs 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — the 415 V figure is the one that governs most European 400 V distribution panels, and 121 kA gives generous headroom above typical 50 kA or 65 kA fault levels.
Motor Protection Specifics
The breaker is designated as motor protection design, which means its trip curve and thermal memory are tuned for motor inrush and overload profiles — not the same as a standard distribution MCCB. Maximum power loss is 37.5 W, relevant for enclosure thermal calculations when the breaker is enclosed alongside other heat sources. Operating temperature range spans -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Auxiliary and Release Configuration
Factory-fitted with two auxiliary switches, one trip alarm switch, and one electrical alarm switch HQ — the HQ designation indicates high-qualified contacts rated for low-energy signal circuits typical of PLC inputs. Includes a shunt trip release (STL) for remote tripping via an emergency-stop or safety relay circuit. The basic switch variant is order code 3VA2325-5MN32-0AA0, which is the core switching mechanism this assembly builds on. No undervoltage release fitted; no ground-fault monitoring module included — those are separate accessory additions if needed.