What this part is
The Siemens 5SV6016-7KK16 is a SENTRON arc-fault detection device (AFDD) combined with a miniature circuit breaker (MCB) in a single compact unit. It is rated 16 A at 230 V AC, 50 Hz, with a C tripping characteristic, and provides a 6 000 A breaking capacity per both EN 60898-1 and IEC 60947-2. The 1P+N pole design and 18 mm width (1 modular unit) let it slot into standard DIN-rail distribution boards without crowding adjacent ways.
What the ratings mean for a panel builder
The C-curve (tripping between 5× and 10× In) is the standard choice for general-purpose lighting and small motor circuits where inrush is moderate — it avoids nuisance trips from transformer or capacitor-start loads that a B-curve would catch. The 6 kA breaking capacity at 230 V AC is adequate for most residential and light-commercial sub-distribution boards; if your fault current at the panel exceeds 6 kA, you need to step up to a higher-rated breaker or coordinate with a current-limiting upstream device. Overvoltage category III and pollution degree 2 confirm it is rated for fixed-installation use inside a distribution board, not for outdoor or wet locations.
Arc-fault detection — the so-what
This is not a plain MCB. The integrated AFDD detects series arcs (down to 2 A) and parallel arcs (down to 50 A) that a standard breaker would not see — the kind of low-current arcing that can start a fire inside a cable joint or a loose terminal. It is designed to trip on those arcs while still providing full overcurrent and short-circuit protection. The 1.81 W power loss per pole at rated current is modest; in a densely populated enclosure, derate for mutual heating if the ambient exceeds 40 °C.