The Siemens 5SV3312-6MJ01 is a residual current operated circuit breaker (RCBO) combining overcurrent and earth leakage protection in a single 1+N-pole module. The Type A designation means it detects both sinusoidal AC fault currents and pulsating DC fault currents — the kind produced by rectifiers, VFDs, and switched-mode power supplies common in modern control panels. The short-time-delayed G characteristic (also marked as OEZ / LFN-25-2-030A-G) provides selectivity: it holds during brief inrush or transient leakage events so that only the downstream faulted circuit trips, not the upstream RCD. This makes it suitable for sub-distribution boards feeding mixed loads with electronics.
Deployment context
The 30 mA sensitivity meets the touch-protection threshold for final circuits per IEC 60364, while the 10 kA breaking capacity coordinates with upstream MCCBs or fuses in a typical 230/400 V commercial installation. The short-time-delayed G characteristic avoids nuisance tripping on circuits with capacitive leakage or brief surge currents, so it fits lighting, socket outlets, and small equipment feeds where selectivity with a Type S or selective main RCD is required.