The Siemens SENTRON 5SJ6216-6KS is a 2-pole miniature circuit breaker in the 5SJ6 series, rated 16 A at 400 V AC with a B tripping characteristic.
Width is 36 mm (2 modular units), depth 76 mm, height 90 mm, with an installation depth of 70 mm. That matches the standard 18 mm/module DIN-rail footprint — drops into any SENTRON or generic distribution board without extra adaptors. Screwless outgoing terminals speed wiring; touch protection is built in.
DC rating and application notes
Rated for DC operation up to 60 V maximum — useful for control-circuit protection or DC distribution in telecom shelters. Mechanical service life is 20 000 cycles typical. Mounting position is unrestricted. No neutral conductor switching on this 2P variant.