What this MCCB is and what it does
The Siemens 3VA2325-5MN32-0DL0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection. It is a 3-pole unit rated at 250 A continuously at 40 °C, with no derating required up to 70 °C — the current rating holds flat across the entire operating temperature range. This makes it a straightforward fit for a motor branch circuit where ambient temperature in the enclosure stays within that band. Breaking capacity is specified by voltage: 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 187 kA figure at 240 V is the headline number — it tells you this breaker can handle very high available fault current on a 240 V system without needing a current-limiting upstream device. At 690 V the 7.5 kA rating is lower, but that voltage is uncommon for motor branch circuits this breaker would typically protect. The part includes an undervoltage release (UVR) as the auxiliary release, plus a complement of auxiliary switches: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch. Phase failure detection is built in. A trip indicator is present on the front face for quick visual status on the panel door.
Mounting and panel fit
Dimensions are 248 mm high, 138 mm wide, 110 mm deep. The 138 mm width is the standard 3-pole MCCB footprint for this SENTRON frame size — it occupies three adjacent 45 mm-wide DIN positions if panel-mounted on a mounting plate, or bolts directly into the enclosure backplane. Depth of 110 mm (4.33 in) leaves room behind a 200 mm-deep enclosure for wiring and the UVR coil connections. Maximum power loss is 40 W. In a sealed enclosure with multiple breakers, that heat adds up; factor it into the thermal budget if the panel is IP-rated and uncooled.