What this MCB is and where it fits
The Siemens 5SL7402-8RC is a 4-pole miniature circuit breaker rated 415 V with a 15 kA breaking capacity, D characteristic, and 2 A rated current. It snaps onto DIN rail in a distribution board or sub-panel, sized for protecting final circuits against overload and short-circuit in three-phase systems up to 415 V line-to-line.
What the ratings mean for fit
The D tripping curve means it tolerates inrush currents 10–14 times the rated current before the magnetic trip operates — designed for loads with high starting surges like small motors, transformers, or discharge lighting. At 2 A, this is a low-current branch breaker, not a main incomer. The 15 kA breaking capacity at 415 V is the maximum fault current it can safely interrupt without welding contacts or rupturing the case; verify the prospective short-circuit current at the installation point is below that figure.