The 5SL4325-7 is rated to interrupt fault currents up to 10 kA per EN 60898 and IEC 60947-2 — this is the standard breaking capacity for most residential and light commercial distribution boards in 400 V three-phase systems.
C-Curve Trip Characteristic: Matching the Load Type
The C-curve trips between 5× and 10× rated current (125 A to 250 A for this 25 A unit), which suits loads with moderate inrush — motor starters, small transformers, fluorescent lighting banks. For purely resistive loads or long cable runs where inrush is minimal, a B-curve (3× to 5× In) provides faster fault clearing; for high-inrush loads like large motors or welding equipment, a D-curve (10× to 20× In) avoids nuisance tripping.
Active Lifecycle and Sourcing Reality
IP20 protection (with connected conductors) and overvoltage category III cover the typical distribution board environment. The MCB is sealable, halogen-free, and silicon-free — relevant for installations requiring low-corrosion or clean-room compliance.