Box opened just for photos. Item comes from an old 'spare parts' cabinet that is being cleaned out. 

Below are links that might tell you more about the item.

https://www.littelfuse.com/products/protection-relays-and-controls/time-delay-relays/interval/erdi/erdi436.aspx

https://www.digikey.com/en/products/detail/littelfuse-inc/ERDI436/8552103

Im not an electrician but I'll do my best to answer any questions you may have.

*If you order more than one listing from me, complete both purchases and I will refund you the difference in shipping.