The Marathon/Kulka 651-XPR-11 is a fanning strip accessory for terminal blocks, specifically designed for compatibility with 601 and 699 series blocks. Constructed from XP Phenolic material, this accessory offers durability and reliable performance in various industrial applications. It is available in multiple sizes to accommodate different configurations and provides a convenient solution for marking and insulation. For accurate ordering, refer to the catalog numbers provided. Marking strips use an 'MS' prefix and insulator strips use an 'IS' prefix.