Ratings and what they mean for fit
The 5SP4291-6: The 100 A rating at 30 °C is the headline figure, but the derating curve matters when the breaker lives in a warm enclosure. Per the datasheet, at 40 °C it carries 95 A, at 50 °C it drops to 89.5 A, and at 60 °C it is down to 84 A. If your panel ambient runs above 30 °C, size the load against the derated value, not the 30 °C number. The B characteristic (3–5× In magnetic trip) is the standard choice for resistive and general-purpose loads where inrush is low — lighting, heating, distribution subfeeds. It is not intended for motor starting or transformer primary circuits that draw a higher inrush; those call for a C or D curve. The 10 kA breaking capacity per EN 60898 at 400 V AC means this breaker can safely interrupt a fault current up to 10 kA without welding or rupturing. That is adequate for most commercial and light industrial distribution boards fed by a transformer of typical impedance. If the prospective short-circuit current at the installation point exceeds 10 kA, you need a higher-rated device or a current-limiting upstream breaker.
Mounting and integration
Mounts on DIN rail (EN 60715) or via screw fixing — either works, and the mounting position is unrestricted. The breaker occupies 3 modular width units (54 mm) on the rail, with an installation depth of 70 mm and an overall depth of 76 mm. Tunnel terminals at both top and bottom accept the conductors; touch protection is built in per the design. The housing is halogen-free and silicon-free, which matters for panels in clean-room or semiconductor-adjacent environments where outgassing can contaminate optics or contacts. Pollution degree 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation) is the rating — typical for industrial control panels not in a sealed, climate-controlled room. IP20 with connected conductors, IP40 at the handle area with the distribution cover fitted. That is standard for enclosed distribution boards; the breaker itself is not rated for washdown or outdoor exposure without an enclosure.
Environmental and mechanical endurance
Rated for ambient temperatures from -40 °C to 75 °C, with a maximum 95% relative humidity. Shock resistance per IEC 60068-2-27 is 150 m/s² at 11 ms half-sine; vibration resistance per IEC 60068-2-6 is 50 m/s² at 25 to 150 Hz and 60 m/s² at 35 Hz (4 seconds). These figures confirm it can handle the mechanical stress of shipping and normal panel vibration from contactors or drives mounted on the same rail.