Siemens 5SL3350-7 SENTRON MCB — 50 A, C-Curve, 3-Pole
The Siemens 5SL3350-7 is a SENTRON miniature circuit breaker (MCB) rated for 50 A at 400 V AC, with a C tripping characteristic and 3 poles. It carries a 4.5 kA breaking capacity per both EN 60898 and IEC 60947-2, meaning it can safely interrupt fault currents up to that level in residential and infrastructure branch circuits. The C-curve trips between 5 and 10 times rated current, so it handles moderate inrush from motor loads or transformers without nuisance tripping, while still clearing short-circuit faults fast enough for cable protection.
What the Ratings Mean for Fit
The 50 A rating at 400 V AC matches a 3-pole feeder or submain in a 3-phase panel. The C-curve is the default for general-purpose commercial and light industrial loads — it holds through the 6–8x inrush of a 3 kW motor starting direct-on-line. The 4.5 kA breaking capacity is adequate for most residential and light commercial service entrances; if your available fault current exceeds that, you need an upstream current-limiting fuse or a higher-rated MCB from the SENTRON 5SL6 series.
Panel Integration and Wiring
Snap-on mounting to DIN rail, any position. Occupies 3 width units (54 mm). Accepts solid or stranded copper from 0.75 to 25 mm². Terminal torque spec is 2.5 to 3 N·m — no special tooling needed. Installation depth is 70 mm, overall depth 76 mm including the actuator. IP20 with connected conductors, touch-protected terminals. Sealable, halogen-free, silicon-free — suitable for food processing or clean-room environments where outgassing matters.
Environmental and Compliance
Rated ambient temperature -25 to +45 °C, storage -40 to +75 °C. Overvoltage category 3, energy limiting class 3. The product designation follows DIN EN 61346-2 and DIN EN 81346-2 (function code F). No neutral conductor switching — this is a 3-pole breaker for 3-phase circuits only. Compliance documentation (RoHS, REACH, UL, IEC) is provided with the standard Siemens declaration of conformity for the SENTRON range.