The Siemens 5SJ6140-7RC is a 1-pole miniature circuit breaker from the 5SJ6 Retail line, rated at 40 A with a C characteristic and a 6 kA breaking capacity. The C-curve trip characteristic means it is sized for moderate inrush loads — common on motor circuits, transformers, and lighting banks in commercial and light industrial panels — where the magnetic trip threshold sits at 5 to 10 times rated current, avoiding nuisance trips on startup while still clearing a hard short.
Fit and Application
Snaps onto standard DIN rail in a distribution board or sub-panel. The 6 kA breaking capacity at 230/400 V AC is sufficient for most commercial and light industrial service-entrance or branch-circuit applications where the prospective short-circuit current stays under that threshold. The 40 A rating and C characteristic make it a direct fit for a 40 A feeder or a motor branch circuit where the upstream device is coordinated for selectivity.