What this MCCB carries — and what the ratings mean on your line
The SENTRON 3VA2225-6JQ32-0CA0 is a 3-pole molded case circuit breaker rated for line-protection duty, meaning it sits at the feeder or main distribution point where the priority is clearing faults fast and coordinating with downstream breakers. Its 250 A continuous rating at 40 °C is the number you spec against — at 70 °C ambient it derates to 200 A, so don't assume full capacity in a hot enclosure. The interrupting capacity is where this breaker earns its place: 242 kA at 240 V and 187 kA at 415 V give serious fault-clearing headroom for high-fault installations. At 690 V it drops to 4.5 kA, which tells you this is a 480 V class breaker, not for 690 V mains. An undervoltage release is built in, so the breaker trips if control voltage drops — common on safety circuits or emergency-stop chains where you want the breaker to drop on power loss. Communication function is present, enabling integration with monitoring systems for load shedding or remote trip indication. Maximum power loss runs 50.5 W — factor that into enclosure thermal calculations if you're stacking breakers in a tight panel.
Integration — panel fit and wiring
Dimensions are 86 mm deep, 105 mm wide, and 181 mm high — a standard MCCB footprint for 250 A class. The 105 mm width per pole (35 mm/pole) is typical for SENTRON 3VA frames; plan your DIN-rail or mounting-plate layout accordingly. The undervoltage release coil draws from the control circuit — verify polarity and voltage rating against your control transformer before wiring.
Selectivity and coordination notes
With a minimum trip setting of 375 A and maximum of 2 500 A, the electronic trip unit gives a wide adjustment range for selective coordination with downstream breakers. The interrupting curve at 240 V (242 kA) vs 415 V (187 kA) vs 500 V (121 kA) means you get full fault-clearing performance through 480 V systems — above that, the 4.5 kA at 690 V is a hard limit, not a derating. For 690 V applications, step up to a higher-voltage frame.