D4 series polyphase (1968-1983) Previous
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The D4 line of polyphase was a redesign of the D2 line of polyphase meters. The frame was redesigned to make it one piece instead of 2 as well as making it so it could be used on both 2- or 3-stator meters. This was accomplished by mounting the voltage and current coil sections separately to the frame. The disk on the D4 line of meters is larger than the one used on the D2 line of meters (opposite from the singlephase D3S to D4S disk design transition).
 
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