Siemens 5SJ6425-7RC — MCB, 4-pole, 6kA, 25A, C-curve
The Siemens 5SJ6425-7RC is a 4-pole miniature circuit breaker from the Retail line, rated 25A with a C characteristic and a 6kA breaking capacity.
The 6kA breaking capacity (Icn) means this MCB can safely interrupt a fault current up to 6,000 amps at its rated voltage — sufficient for most commercial and light industrial service-entrance panels where the prospective short-circuit current stays under that threshold. The 25A rating governs the continuous load: it will carry 25A indefinitely in a 30°C ambient, but the C-curve allows brief overloads (motor starting, capacitor inrush) without nuisance tripping.