At 18 mm wide, it occupies a single modular unit on a DIN rail, so it fits standard enclosure layouts without crowding adjacent devices. The 13 A rating derates with rising ambient temperature: 12.38 A at 40 °C, 12.05 A at 45 °C, 11.73 A at 50 °C, 11.38 A at 55 °C, and 11.02 A at 60 °C (–). The IP20 protection is standard for panel-mounted gear; it's not rated for wet or dusty environments without an enclosure.
The 5SY4113-8 carries approvals to IEC/EN 60898-1, IEC/EN 60947-2, and UL1077, which covers most European and North American installations. It's halogen-free and silicon-free, a detail that matters in clean-room or semiconductor-adjacent panels where outgassing is a concern.
The 70 mm installation depth and 76 mm overall depth leave clearance for wiring behind the rail. The neutral conductor is not switched — this is a single-pole breaker for line-only protection, common in single-phase branch circuits where the neutral is bonded elsewhere.