What this MCCB is and what it does
The Siemens SENTRON 3VA2325-5MN32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated at 250 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It is designed specifically for motor protection, with built-in phase failure detection that trips the breaker if one phase drops out, preventing single-phasing damage to the motor windings. Breaking capacity is 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 — so it handles high-fault-current scenarios at common low-voltage distribution levels, with the 690 V figure being the practical ceiling for this frame size. The part ships with three factory-fitted HQ auxiliary switches (3VA2325-5MN32-0AA0 basic switch) and no undervoltage release or ground-fault monitoring module; those are add-on options if your scheme requires them.
Integration and mounting
The breaker measures 248 mm high × 138 mm wide × 110 mm deep. That 138 mm width is a standard 3-pole MCCB footprint — it fits existing SENTRON panel cutouts and busbar systems without adapter plates. The 110 mm depth leaves clearance for rear-connected busbars or cable ladders behind the mounting plate. Maximum power loss is 37.5 W at rated load — relevant for enclosure thermal calculations if you are packing multiple breakers in a sealed cabinet. Operating temperature range is -25 °C to +70 °C, storage from -40 °C to +80 °C.