The Siemens 5SV3347-6MJ01 is a 4-pole residual current operated circuit breaker (RCCB) rated 80 A with 30 mA sensitivity, Type A, short-time-delayed characteristic G, and a 10 kA breaking capacity at 400 V. The 30 mA trip threshold covers personnel protection against direct contact; the Type A designation means it detects pulsating DC fault currents as well as sinusoidal AC — needed on circuits feeding single-phase rectified loads like switched-mode power supplies or variable-speed drives. The short-time-delayed G characteristic provides selectivity against nuisance tripping from transient leakage currents, so it coordinates downstream without dropping the whole submain on a momentary surge.
What the ratings mean for fit
The 80 A continuous rating and 10 kA breaking capacity at 400 V mean this RCCB can serve as the main residual current protection for a sub-distribution board feeding mixed loads up to that current, and it safely interrupts fault currents up to 10 kA without upstream fuses needing to clear first. The 3+N-pole configuration (switched neutral) is standard for 4-wire TN or TT systems where the neutral must be disconnected to isolate the circuit. The short-time-delayed G characteristic (typically 10–40 ms delay) allows downstream instantaneous RCCBs to trip first, keeping supply to healthy circuits — a coordination requirement in multi-level distribution panels.