The Siemens 5SN6450-7CN is a SENTRON miniature circuit breaker (MCB) rated 50 A with a C tripping characteristic, 4 poles, and a 6 kA breaking capacity per EN 60898 at 400 V AC. Pollution degree 2 covers normal industrial environments with only non-conductive contamination that might become temporarily conductive due to condensation.
Sourcing and lifecycle — what to expect
The MCB is sealable, halogen-free, and silicon-free — relevant for installations in clean rooms, food processing, or areas with sensitive electronics where outgassing or corrosion from halogens or silicones is a concern.
Integration notes — panel fit and wiring
The 5SN6450-7CN accepts solid conductors up to 25 mm² at the terminals — enough for 50 A on a 4-pole breaker, but watch the torque spec in the datasheet. The power loss per pole at rated current in hot operating state is 3.6 W, so for a 4-pole unit you're looking at about 14.4 W total heat dissipation inside the enclosure. Factor that into your thermal budget, especially if the panel is sealed or has multiple MCBs in a row. If the panel sits in a hot, humid environment without climate control, the MCB will handle it, but the surrounding temperature influence may shift the thermal trip curve — derate if you're running near the 50 A limit at elevated ambient.