The Siemens SENTRON 5SY6620-8 is a 4-pole (3P+N) miniature circuit breaker with a D-curve tripping characteristic, rated 20 A at 400 V AC. The D-curve means it tolerates short-duration inrush currents 10–20× the rated current — designed for motor, transformer, or welding loads where the start-up surge would nuisance-trip a B- or C-curve breaker. Breaking capacity is rated 6 kA per EN 60898 (domestic/commercial standard) and 15 kA per IEC 60947-2 (industrial standard), giving headroom for high-fault installations like machine tool or HVAC panels where the prospective short-circuit current exceeds 6 kA.
Position of supply cord is any, mounting position any, so it fits tight enclosures without orientation restrictions.