The Siemens 5SL3350-6 is a 3-pole SENTRON miniature circuit breaker (MCB) rated for 50 A at 400 V AC, with a B tripping characteristic and a breaking capacity of 4.5 kA per both EN 60898 and IEC 60947-2.
At 50 A continuous and 400 V AC, this breaker handles standard single-phase or three-phase branch circuits up to that current. The B characteristic holds up to 2.5× In indefinitely and trips above 5× In. That avoids nuisance trips on lighting or heating loads. Terminals accept solid or stranded conductors from 0.75 to 25 mm², with a tightening torque of 2.5 to 3 N·m. The screw terminals are touch-protected, and the design is halogen-free and silicon-free — relevant for clean-room or low-smoke environments.
The breaker is sealable to prevent tamper — a feature for metering or security applications.