Hub: This is a fitting that creates a connection point for electrical conduit to enter a load center (an electrical panel housing circuit breakers).

1": This refers to the nominal trade size of the conduit it is designed to accept.

Type HS hub openings: This specifies the exact type of opening on the Siemens load center that this hub is compatible with, ensuring a proper fit and seal.

ANSI certified: Meets standards set by the American National Standards Institute, indicating quality and performance.

CSA listed: Certified by the Canadian Standards Association, meaning it meets Canadian safety and performance standards.

UL listed: Certified by Underwriters Laboratories, indicating it meets rigorous safety standards for electrical components in the United States. These certifications are crucial for ensuring the product is safe and compliant with electrical codes.

This clearly states the brand compatibility. Since Siemens owns Murray, it's common for accessories to be interchangeable between these two brands' products.

These dimensions provide the physical size of the hub, which is important for installation planning and ensuring it fits within the load center's space constraints.