The Siemens 5SL6450-7 is a SENTRON 4-pole miniature circuit breaker with a C tripping characteristic, rated 50 A at 30 °C on a 400 V AC system. The C-curve means it holds through mild inrush — motorized loads like small pumps, fans, or compressors — and trips fast on a hard short. At 50 A it's sized for a 25–30 kW resistive load or a 15–18 kW motor group on a 400 V three-phase feed.
At 40 °C it derates to 46.97 A; at 55 °C it's 42.01 A. Mounts in any position.
Panel fit
Depth is 76 mm (70 mm behind panel face), width 72 mm (4 modules), height 90 mm. Sealable with a lead seal or lockable cover — useful for utility-metering applications where tamper evidence is required. Halogen-free and silicon-free construction — no corrosive off-gassing in a fire, which matters for ventilation-duct or clean-room adjacent panels.