CS/CA series polyphase (1937 to 1960s) Previous
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With the introduction of the standardized polyphase meter mountings, the C series polyphase meters were replaced by the CS and CA series polyphase meters. In order to meet the demand for a socket polyphase meter, Westinghouse reverted to using OB-style stators in order to squeeze the two-stator C series meters into the socket enclosure. The CS-3 three-stator socket meter uses an oval cover and an adapter base (similar to the Duncan MH 3-stator meters). The CA line of polyphase meters continued to use the same stators as in the C line of meters. In 1961, Westinghouse introduced an Alnico magnet that replaced the copper-plated chrome steel magnet that had been used since the late 1930s (shown on the 3-stator meter).
 
CS-5 meter
Joe Maurath Jr. collection
3-stator CA meter
Pete Mallet collection