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On the series C 9050JCK70, there are two different letters to select for the timing function - what do those different letters mean?

Issue:
On the series C 9050JCK70, there are two different letters to select for the timing function - what do those different letters mean? 

Product Line:
General Purpose Plug-In Relay

Environment:
Square D General Purpose Plug-In Relay

Resolution:                                                                 
Letter sets are the same and were incorporated so there would not be any empty slots on the selection dial. For example, Letter A or Letter F will set timer for On Delay mode - Letter B or Letter G will set timer for Interval mode, etc.
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