New units of the original EZD 311 are becoming scarce as manufacturers push cloud-enabled versions. However, distributors like RS Components, AutomationDirect, and eBay have substantial inventories of New Old Stock (NOS) or recertified units.
Disclaimer: This article is for informational purposes. Always consult the official hardware manual for your specific revision of the EZD 311. Electrical installation should only be performed by qualified personnel.