The Siemens SENTRON 5SL4640-6 is a 3P+N miniature circuit breaker rated 40 A with a B tripping characteristic, breaking 10 kA at 400 V AC per both EN 60898 and IEC 60947-2. The 76 mm depth plus 70 mm installation depth fits standard distribution board enclosures. IP20 with connected conductors — protected against finger contact once wired, but not against moisture; keep it inside a closed panel. Sealable per the spec, so a utility or facility manager can lock the handle position after commissioning.
Snap-on DIN rail mount, any orientation. The 72 mm width (4 MWU) occupies four standard module positions. Supplementary devices can be installed on the right side. Power loss is 3.4 W per pole at rated current.