We’ve had a few requests come in recently for alternates to this relay, KOZ-RBS-2604, which is a part number that we do not currently carry.
After going over our options and notes, 281-4918-ND (Weidmuller# 4058560000) should be a good option for an in-stock replacement that we can provide.
As always, it is recommended that you look over the manufacturer data sheet for this part number to verify that it is suitable for your application before you make a purchase or install it. Hope this helps!