What the ratings mean for fit
The Siemens 3VA2325-7MN32-0KA0 is a SENTRON molded case circuit breaker rated for 250 A continuous current across the 40 °C to 70 °C ambient range. Breaking capacity is the headline number for fault coordination: 330 kA at 240 V AC, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 7.5 kA at 690 V. Those figures are the maximum fault current the breaker can safely interrupt without welding contacts or rupturing the case. At 415 V, the 242 kA rating means it can be placed upstream of a transformer or busway with very high available fault current — typical for large industrial switchboards — and still maintain selectivity with downstream devices. The 3-pole design and motor protection designation mean this MCCB is intended for three-phase motor branch circuits. Phase failure detection is built in, so the breaker will trip on loss of one phase — a common cause of motor overheating and winding damage. The shunt trip release allows remote tripping via a control signal, which is useful for emergency-stop circuits or supervisory shutdown. Time-delay settings span 4 s minimum to 17 s maximum, which governs the short-time pickup and delay for coordination with downstream feeders. A 17 s delay at low overcurrents lets downstream breakers clear a fault first, maintaining selectivity. The maximum power loss is 37.5 W — relevant for thermal management inside a sealed enclosure.
Integration and mounting
Dimensions are 110 mm depth, 138 mm width, and 248 mm height. This is a standard SENTRON 3VA2 form factor, designed for panel-mount or DIN-rail installation in a distribution board or motor control center. The 138 mm width fits a 3-pole MCCB footprint common across the 3VA2 family.