The Siemens 5SV3446-6MJ01 is a residual current operated circuit breaker (RCCB) Type A, rated 63 A at 400 V with a 100 mA trip sensitivity and 10 kA breaking capacity. The 3+N-pole configuration and short-time delayed characteristic make it suitable for sub-distribution boards where selective coordination with downstream RCCBs is needed — the delay prevents nuisance tripping from transient leakage currents typical of motor drives or switched-mode supplies.
Type A detection covers sinusoidal AC residual currents plus pulsed DC residual currents up to 6 mA — this catches half-wave rectified leakage from single-phase drives, washing machines, or LED drivers that a Type AC RCCB would miss. The 100 mA sensitivity is not for personal shock protection (that requires 30 mA); it is sized for equipment protection and fire prevention on circuits with naturally higher leakage, such as long cable runs or industrial machinery.