Based on this product's specifications, here are some alternatives and similar models
Rittal OM‑Adapter with connection leads 690V for busbar system 9340.780 polyamide light gray (RAL 7035)
Summary description:
OM‑Adapter by Rittal (model 9340.780) is a polyamide accessory for busbar systems, supplied with connection leads and rated for up to 690 V. Designed for safe electrical connection and integration into modular distribution assemblies, it fits compatible Rittal busbar components and simplifies wiring in electrical enclosures, switchgear and distribution panels.