Based on this product's specifications, here are some alternatives and similar models
Busbar Holder Rittal 9677.500 — mounting accessory for electrical busbar systems
Summary description:
Rittal Sammelschienenhalter (model 9677.500) is a dedicated busbar holder designed as a mounting accessory for electrical busbar systems. It secures and positions busbars within switchgear and distribution enclosures, supporting safe electrical connections and organized routing. Suitable for use in industrial and commercial electrical installations where stable busbar fixation is required.