Circuit Breaker Pole Module With Vertical Creepage Ribs

Instead of providing horizontal protrusions on the wall surface to increase creepage distance, the invention inverts the approach by providing vertical creepage ribs that extend from the top end to the bottom end of the housing. This inversion transforms the creepage path from a horizontal surface modification to a vertical structural element, achieving the required creepage distance without complicating the molding process, as the ribs can be directly formed as integral parts of the housing during injection molding.

Instead of increasing the height of the housing to achieve sufficient creepage distance, the invention utilizes the radial dimension by providing creepage ribs that extend vertically along the inner surface of the housing wall. This dimensional shift allows the creepage path to be extended in the radial direction rather than increasing the overall height, thereby maintaining compliance with dimensional constraints while achieving the required dielectric strength.

The vertical creepage ribs serve multiple functions simultaneously: they provide the required creepage distance for dielectric strength, acts as draft features to facilitate demolding of the injection molded housing, and can serve as mounting features for internal components. By integrating these multiple functions into a single structural element, the invention reduces overall device complexity rather than increasing it, as the ribs are formed as integral parts of the housing during the molding process.