If your BOM called for a 4P breaker in this frame, the 2 A rating is the first check: verify your load draw stays well under 2 A continuous.
Lockout and isolation — show me the rating
The 5SY4402-5 is sealable — it accepts a padlock hasp for positive lockout/tagout. If it's not locked, it's not safe. Overvoltage category III confirms it can handle distribution-level transients on the line side.
Mounting and enclosure fit
Depth is 76 mm, width 72 mm, height 90 mm — 4 modular width units (4 M). Mounting position any, fastening is via the quick assembly system (standard DIN rail). Installation depth 70 mm; vibration resistance tested to ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz.
Breaking capacity — match your SCCR
Breaking capacities: 10 kA, 35 kA AC, 15 kA DC, 5 kA (UL/CSA). Verify system SCCR does not exceed the applicable rating. Supply frequency 50/60 Hz; rated voltage 400 V AC (440 V multi-phase).