What this MCB is and what the ratings mean for fit
The 5SL6620-7: The 4-pole, 4-module-width (72 mm) footprint snaps onto standard DIN rail and fits any mounting position. Depth is 76 mm, installation depth 70 mm — the extra 6 mm is the handle throw, so allow clearance in the enclosure door. Rated for overvoltage category III and pollution degree 2, which is the standard for fixed-installation distribution boards. IP20 with connected conductors means it's protected against finger contact but not against moisture — keep it inside a rated enclosure in wet locations.
Panel integration and compliance notes
Sealable design allows the installer to lock the handle in the OFF position with a padlock — useful for lockout/tagout on a final subcircuit without pulling the main disconnect. Halogen-free and silicon-free construction matters if the breaker lives in a clean room or a zone where outgassing during a fault could contaminate optics or electronics. Touch protection is built in; no separate finger-duct shield needed on the line side. Mechanical service life is 10 000 switching cycles typical — fine for branch-circuit protection where the breaker operates a few times a year, not for frequent switching duty (use a contactor for that).