What the ratings mean for the panel
The Siemens 5SV3314-6MJ01 is a residual current operated circuit breaker Type A, rated 40 A with 30 mA sensitivity and a 10 kA breaking capacity at 230 V. The Type A designation means it detects sinusoidal AC residual currents and pulsed DC residual currents up to 1 kHz — covering rectifier-fed loads like VFDs, switching power supplies, and LED drivers that a Type AC device would miss. The 30 mA trip threshold is the standard for personal protection against direct contact. The 10 kA short-circuit capacity means it safely interrupts fault currents up to that level without upstream coordination failure, sized for the main distribution board in a commercial or light industrial installation. The 1+N-pole configuration switches the phase and isolates the neutral, common for single-phase final circuits. The short-time delayed characteristic (marked as OEZ / LFN-40-2-030A-G) provides selectivity against downstream RCCBs — it holds during a transient fault to let the closer device clear first, avoiding a whole-floor blackout on a ground leak.
Where it fits in the installation
Mounts on standard DIN rail in a consumer unit or sub-distribution board. The 1+N-pole width occupies two modular spaces (2 MW). Rated for 230 V single-phase circuits; the 40 A rating suits it for high-load final circuits like electric showers, heat pumps, or large commercial socket banks. The short-time delay ensures coordination with downstream 30 mA RCCBs — install this at the submain or distribution board level, with standard instantaneous RCCBs on the final circuits.