Integrator's spec recap — 5SL6550-7
The Siemens 5SL6550-7 is a SENTRON miniature circuit breaker (MCB) in a 1P+N configuration — one protected pole plus a switched neutral — with a C-curve trip characteristic rated 50 A at 230 V AC. Breaking capacity is 6 kA per both EN 60898 and IEC 60947-2, so it coordinates with downstream loads in residential and light commercial distribution boards where the prospective fault current stays under that threshold. The C-curve (rated 50 A) trips between 5× and 10× In, making it a standard choice for mixed resistive and moderate inductive loads — lighting circuits, small motor branch circuits, and general-purpose socket outlets — where inrush isn't severe enough to need a D-curve. Thermal derating is published: 46.97 A at 40 °C, 45 A at 45 °C, 42.01 A at 55 °C. If the panel ambient runs above 30 °C, size the upstream feeder for the derated figure, not the nameplate 50 A.
DIN-rail footprint and panel fit
Width is 36 mm (2 modular units), depth 76 mm, height 90 mm. Installation depth 70 mm. Mounts in any position on standard DIN rail. IP20 with conductors connected — suitable for enclosed distribution boards, not for wet or washdown locations. Sealable (tamper-evident cover available) and halogen-free / silicon-free construction — relevant for installations with strict off-gassing requirements (hospitals, clean rooms, data centers).
Compliance and documentation
Rated for overvoltage category III, pollution degree 2. Mechanical service life 10,000 operating cycles typical. Energy limitation class 3. The part carries approvals per EN 60898 and IEC 60947-2; the manufacturer provides RoHS, REACH, and CE declarations as standard for the SENTRON line.