The Siemens 5SL6620-6 is a SENTRON miniature circuit breaker with a 3P+N pole configuration, rated 20 A with a B tripping characteristic. It breaks 6 kA at 400 V AC per both EN 60898 and IEC 60947-2, so it handles residential and light commercial fault currents up to that level without needing an upstream fuse for backup. It occupies 4 modular width units (72 mm) on a DIN rail, and the 76 mm depth leaves room for cable management in a standard distribution board.
The 6 kA breaking capacity at 400 V AC is the same under both EN 60898 (household standard) and IEC 60947-2 (industrial standard), so this breaker is accepted in both residential and light industrial distribution boards without coordination paperwork. The B characteristic (3–5× In) is the right choice for resistive loads and general socket circuits — it avoids nuisance trips on small transformer inrush but clears fast on a hard short. Rated operating voltage is 400 V AC three-phase, with a maximum of 440 V AC multi-phase, and it handles 50/60 Hz supply frequency. The 72 V DC maximum rating means it can switch some DC control circuits, but it is primarily an AC device. Power loss per pole is 2.3 W at rated current in hot operating state — four poles means about 9.2 W total heat to dissipate inside the enclosure. In a crowded distribution board with multiple breakers, that heat adds up; leave adequate ventilation or derate if ambient exceeds 40 °C.
Mounting and integration notes
The 4 MW width (72 mm) matches the standard SENTRON footprint, so it aligns with busbar systems and enclosure cutouts designed for that modular pitch.