What this MCCB carries — and what it means for your panel
The Siemens 3VA2325-5MN32-0BH0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous at 40 °C through 70 °C — no derating curve to chase across the typical panel ambient range. That flat thermal performance means you can load it to 250 A in a warm enclosure without stepping up frame size. Interrupting capacity is the headline: 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. For a 250 A frame those numbers give serious SCCR headroom — useful when you're coordinating downstream of a large transformer or tying into a high-fault bus. This is a motor-protection design with built-in phase failure detection and an undervoltage release (UVR) as the auxiliary release. It also carries 2 auxiliary switches plus a trip alarm switch HQ. That combination lets it drop into a motor control center without adding external relays for phase-loss or UV protection. The basic switch variant adds the UVR and auxiliary switch complement. The -0BH0 bolts into the same footprint: 138 mm wide, 248 mm tall, 110 mm deep.
Panel fit and wiring notes
Three-pole construction. The 138 mm width is standard for a 250 A SENTRON frame — it occupies three 45 mm pole positions on a DIN rail or bolts directly to a mounting plate. Depth of 110 mm leaves room for rear-connected busbars or cable lugs without crowding the back panel. Maximum power loss is 40 W. In a sealed enclosure that's enough heat to factor into the thermal rise calculation — don't bury it next to a drive without some airflow. Operating temperature range -25 °C to 70 °C; storage from -40 °C to 80 °C. The storage minimum matters if the breaker sits in an unheated warehouse before installation.