The Siemens 5SV3346-6LB01 is a 4-pole residual current circuit breaker (RCCB) from the SENTRON 5SV3 series, rated 63 A at 400 V AC with a 30 mA trip threshold. Type A detection means it catches sinusoidal AC faults plus pulsating DC fault currents — the standard for mixed-load panels with electronics, drives, or rectifiers. The short-time delayed design (labeled 'short-time delayed' in the product designation) gives it selectivity against transient leakage, so nuisance trips from capacitive inrush or surge arrestors don't drop the whole submain. Mounts on DIN rail, takes 4 width units (72 mm), and installs in any orientation.
Type A detection covers the fault signatures from single-phase rectified loads (switched-mode supplies, VFDs, UPS) that a plain AC type would miss.
DIN rail mount, 72 mm wide (4 width units), 70 mm deep. IP20 with conductors connected — install inside a distribution board with a door or cover. Finger and back-of-hand safe terminals. Silicon-free construction suits potting or conformal-coat environments.