Based on this product's specifications, here are some alternatives and similar models
Phoenix Contact 3210608 End Cover for Terminal Block Grey 50-Pack
Summary description:
Phoenix Contact 3210608 end cover designed for PTTBS 2,5-TWIN terminal blocks. Supplied in a pack of 50 pieces, featuring a durable grey insulating material. Essential electrical installation accessory used to safely cover open sides of terminal blocks, ensuring proper insulation and mechanical protection in professional control cabinet wiring.