Panel fit and ratings at a glance
The 5SJ4301-7HG41: Mounts on standard 35 mm rail, any orientation. Three modular units wide (54 mm), 70 mm deep. The IP rating reads IP20 with conductors connected, IP40 in the handle area — adequate for dry indoor panels, not for hose-down locations.
Environment B for EMC means this breaker does not have to meet immunity limits for interference — it's intended for industrial areas where conducted emissions are less strict, not for critical data centers or medical equipment. The halogen-free / silicon-free spec also supports use in confined spaces (e.g., control cabinets near sensors or PLCs) where outgassing from standard plastics could cause contact failure.