DIN-rail fit and UL 489 rating
The 5SJ4232-7HG42 is 36 mm wide, occupying two modular width units on a standard mounting rail. That UL 489 listing certifies it as a branch-circuit protective device for North American panelboards — not just a European IEC breaker with a UL sticker.
C-curve and trip coordination
For high-inrush loads like large transformers or drives, a D-curve sibling would be a better selectivity match. Per IEC 60947-2 the same breaker carries a 15 kA rated value, giving a higher interrupting ceiling under the international standard. The dual rating lets the same part serve both UL and IEC panel designs — useful for export machinery or multi-standard plants.
Current production and sourcing
The SENTRON 5SJ4 series is Siemens' standard miniature circuit-breaker line for panel building and OEM machinery.