What the 32 A AC-3 rating means for your motor circuit
Its headline rating is 32 A operational current at AC-3 duty (400 V), which means it directly protects a motor drawing up to that current under the heaviest switching category — starting, running, and stopping induction motors with inrush. That 416 A threshold is fixed — not adjustable — so verify your motor's locked-rotor current stays above it to avoid nuisance trips on startup.
The S2 frame takes 55 mm width on the rail — three of these side-by-side fit in a standard 200 mm wide enclosure without crowding. Depth is 149 mm, so plan for at least 160 mm clear behind the panel door to allow wiring and cover clearance. The 15 W typical power loss at full load means no forced ventilation is needed in a standard IP54 enclosure, but cluster several breakers and the internal temperature rise needs checking against the -20 to +60 °C operating range.
Termination and wiring constraints
Screw-type box terminals on top and bottom accept 2 x (0.75 to 25 mm²) solid or stranded, or 1 x (0.75 to 35 mm²). For finely stranded with ferrules, capacity drops to 2 x (0.75 to 16 mm²) or 1 x (0.75 to 25 mm²). AWG equivalents: 2 x (18 to 2) or 1 x (18 to 2). Tightening torque: 3 to 4.5 N·m. That's a standard slot/Pozidriv #2 range — a torque screwdriver set to 4 N·m is the safe middle point. The terminals are rated for the full 32 A continuous; no derating needed for the termination itself, but the 15 W power loss is dissipated through the terminals and housing, so keep adjacent wiring bundles clear of the breaker body.
Operates in 10 to 95 % relative humidity and survives transport from -50 to +80 °C. Shock resistance: 25 g for 11 ms per IEC 60068-2-27 — rugged enough for machine-mounted panels near presses or conveyors. Installation altitude limit is 2 000 m above sea level; above that, derate the current per IEC 60947-2. The part carries a substance prohibition date of 07/01/2006, which aligns with the original EU RoHS compliance deadline — no lead, cadmium, or mercury above threshold. For UL/CSA listings, the SIRIUS family is typically UL 508 listed; confirm the specific file number at quote time if your panel requires a marked UL listing.