Siemens 5SY3216-7 SENTRON MCB — 16 A, 2-Pole, C-Curve
It protects branch circuits against overload and short-circuit in 400 V AC systems, with a breaking capacity of 4.5 kA per EN 60898 and 6 kA per IEC 60947-2 — the higher IEC figure is the one to use for industrial panel coordination studies, since it reflects the actual fault-clearing capability under the standard that governs most switchgear assemblies. At 16 A, this breaker handles typical 3–4 kW motor circuits or general-purpose lighting sub-distribution.
Breaking Capacity & Selectivity
Three breaking-capacity ratings are on record: 4.5 kA at 400 V AC per EN 60898 (the domestic/commercial standard), 6 kA at 400 V AC per IEC 60947-2 (the industrial standard), and 15 kA at 72 V DC per IEC 60947-2. The DC rating of 15 kA at 72 V covers control-circuit and battery-bank protection where the DC bus is under 72 V.
Physical Fit & Mounting
Installation depth is 70 mm — the extra 6 mm accounts for the front toggle and terminal screws. Sealable (padlockable toggle) is a feature for lockout/tagout compliance.