Overview
The C25H34V250 is a Schneider ComPacT NSX molded case circuit breaker rated 250 A with a 100 kA ICu breaking capacity at 440 V AC, fitted with a MicroLogic 4.2 electronic trip unit covering overload (L), short-time (So), and instantaneous (I) protection plus earth-leakage (R). It is a 3-pole fixed-mount unit with toggle control, built to EN/IEC 60947-2, and carries an 8 kV rated impulse withstand voltage.
Selection and sizing
The 100 kA ICu at 440 V AC places this breaker in the H-frame class, suited for high-fault distribution panels where upstream fault current exceeds 50 kA. The 250 A continuous rating matches feeders or large motor branch circuits; the MicroLogic 4.2 trip unit allows field-adjustable long-time pickup and delay.
How it compares
Compared to the C40F4 (4-pole, 400 A, 85 kA ICu at 690 V), the C25H34V250 trades a lower current rating and 3-pole format for a higher 100 kA ICu — pick the C40F4 when the BOM requires 4-pole switching or 400 A capacity, and the C25H34V250 when fault current headroom above 85 kA is the priority.