Legacy Westinghouse MCC that was available from roughly 1965 to 1979
Download the instruction book IB12-129 dated July 1978 below.
You can learn more about vintage Westinghouse products (and parts for those products) at http://www.eaton.com/ecm/groups/public/@pub/@electrical/documents/content/ca08100014e.pdf (http://www.eaton.com/ecm/groups/public/@pub/@electrical/documents/content/ca08100014e.pdf)