What this MCB is and where it lands
The Siemens 5SL6216-6RC is a SENTRON miniature circuit breaker — a 2-pole, 16 A unit with a B tripping characteristic and a 7.5 kA breaking capacity rated per EN 60898. It snaps onto a DIN rail and occupies 2 modular width units (36 mm), making it a standard fit for residential and light-commercial distribution boards where the B curve protects lighting and general-purpose socket circuits against short-circuit and overload.
Key ratings and what they mean for fit
The 16 A rating at 30 °C sets the continuous load it can carry without tripping — sized for a branch circuit feeding receptacles or fixed lighting. The B characteristic means it trips at 3 to 5 times rated current (instantaneous), so it's the right choice for resistive and lightly inductive loads where inrush stays modest; avoid it on motor or transformer primaries where a C or D curve would be needed to ride through the start surge. Breaking capacity of 7.5 kA per EN 60898 tells you the maximum fault current this MCB can safely interrupt. In a residential or small commercial panel with a typical upstream transformer impedance, that's usually adequate — but if the prospective short-circuit current at the board exceeds 7.5 kA, you need a higher-rated unit or a current-limiting upstream device. Rated for 415 V AC and 250 V single-phase, with a maximum of 440 V in multi-phase operation. The 50/60 Hz frequency range covers standard mains worldwide. IP20 with connected conductors is the usual finger-safe protection for a panel interior — no washdown rating, so keep it inside the enclosure. Mechanical life of 10,000 operating cycles is typical for this class — fine for normal switching duty, but if you're cycling it daily as a disconnect under load, expect to replace it sooner. Power loss of 1.9 W per pole at rated current matters for thermal budgeting inside a densely packed enclosure; multiply by two poles for total dissipation.
Panel integration notes
Mounts in any position on a 35 mm DIN rail. Depth of 76 mm and installation depth of 70 mm leave clearance for wiring behind the rail. The 36 mm width — 2 MW — means it takes two adjacent 18 mm slots in a distribution board. Sealable for tamper-proofing after commissioning. Halogen-free and silicon-free construction avoids corrosive off-gassing in sealed enclosures. Supplementary devices (auxiliary contacts, shunt trips, undervoltage releases) can be added on the right side without increasing the pole count — useful for remote tripping or status feedback. Overvoltage category III and pollution degree 2 are standard for fixed-installation distribution boards.