Visual Verification – What to Check on Arrival
The 5SY4420-7: Fake until proven real – start with the sealable housing and the halogen-free marking. Both are factory-identifiers that re-markers routinely omit. The product designation and brand should be laser-engraved, not ink-stamped; surfaces must be free of solvent wipe marks. The IP20 rating with connected conductors is standard but verify the gasket integrity on the terminal cover. The 76 mm depth and 72 mm width correspond to 4 modular units on a DIN rail – a common footprint. Cross-check the physical dimensions against the labelled value; any deviation suggests a re-label from a smaller-frame part.
Panel Fit & Derating
Mounts in any position and uses the quick assembly system. Depth 76 mm, installation depth 70 mm, height 90 mm. Pollution degree 3 and overvoltage category III suit industrial control panels where conductive dust or transient overvoltages are present. The part is silicon-free – no risk of silicone outgassing near sensitive contacts or optics.
Compliance & Sourcing
Designed to IEC/EN 60898-1, IEC/EN 60947-2, and UL1077 – covers both domestic and light-industrial installations. The breaking capacity is 10 kA under 60898-1 and 20 kA under 60947-2; choose the rating that matches the available fault current at the upstream protective device. Pollution degree 3 and overvoltage category III are typical for fixed-installation distribution boards. This part is currently listed as having a 'current' lifecycle stage – sourced to order against an RFQ. No official L* successor is available; verify qty and lead time with your distributor before committing to a BOM line.