Watch the temperature derate
The 5SY4406-7: That 6 A rating holds at 35 °C ambient. In a warm cabinet — say 50 °C — the continuous current drops to 5.41 A, and at 60 °C it's 5.09 A. If you're slotting this next to a drive or transformer that drives the internal temperature up, factor in the derate rather than nuisance tripping. The breaker itself can handle up to 75 °C ambient and as low as -40 °C, so the limits are generous; it's the trip curve that shifts.
Mounting and layout
It snaps onto DIN rail using the quick-assembly system — no tools needed. The installation depth is 70 mm, body is 72 mm wide (4 modular units), and it can be mounted in any position. The neutral conductor is not switched (4P but neutral pass-through), so plan your phase-to-neutral distribution accordingly. Top and bottom terminals accept the same size conductors. Sealable cover is standard if the panel needs tamper-proofing.