The Siemens SENTRON 5SY8316-8BB08 is a 3-pole miniature circuit breaker rated 16 A with a D tripping characteristic, meaning it is designed for loads with high inrush currents — motor starters, transformers, and welding equipment — where the magnetic trip threshold (10 to 20 times In) avoids nuisance trips on startup. Under UL 1077 and CSA C22.2 No. 235 it carries a 5 kA interrupting rating, so for North American supplementary protection applications the lower figure is the binding one. The D curve and 16 A rating suit it for motor branch circuits and other inductive loads in mechanical engineering and industrial environments. The 3-pole configuration (3P) switches all three phases simultaneously; there is no switched neutral on this unit. Rated operating voltage is 440 V AC for both single-phase and multi-phase operation. Maximum DC operating voltage is 72 V, so it is not a primary choice for DC circuits above that level.
Combined terminals at both top and bottom simplify busbar and cable routing. The breaker is sealable, allowing panel builders to lock the switch position for lockout/tagout compliance. Touch protection is integrated on the terminals.