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8501R Transition From Series C to Series D

What change was made from series C to series D on the 8501R type relays?

Product Line:
NEMA Control Relays - GIC Product

US Product

Product Specification

Series C was eliminated in 2014 and replaced with series D.  The series change was to signify a change in the cover to the device.  There is no functional or compatibility issue associated with this change.
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